ALO20F36N-L - Emerson Network Power - Embedded Power

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 1 OF 13

JANUARY 28, 2008 - REVISION 01

ALO20F36 Single Output 8th Brick: 3.3V at 20A output

Wide Range (19V – 60V Input Range)

The ALO20F36 series is Astec’s latest addition to its 8th brick standard products offering. It operates from an input range of 19V to

60V suited for wireless/base station applications that are configured for a 24V or 48V input voltages. The ALO20F36 series is

designed to provide 3.3V output and handle up to 20A of load current. It comes with industry standard features such as Input UVLO;

Output Enable; non-latching OCP, OVP and OTP; Output Trim; Differential Remote Sense pins.

Special Features

• Industry Standard 8th Brick Footprint

• Low Ripple and Noise

• Regulation to zero load

• High Capacitive Load Start-up

• Fixed Switching Frequency

• Industry standard features: Input UVLO;

Enable; non-latching OVP, OCP and OTP;

Output Trim, Differential Remote Sense

• Meets Basic Insulation

Environmental Specifications

• -40ºC to 85ºC Operating Temperature

• -40ºC to 125ºC Storage Temperature

• MTBF > 1 million hours

Electrical Parameters

Input

Input Range 19-60 VDC

Input Surge 100V / 100ms

Control

Enable TTL compatible

(Positive or Negati ve Logic Enable Opti o ns)

Output

Load Current Up to 20A max

Line/Load Regulation 0.1% VO Typical

Ripple and Noise 50mVP-P typical

Output Voltage

Adjust Range ±10% VO

Transient Response 3% Typical deviation

50% to 75% Load Change

120µs settling time (Typ)

Remote Sense +10%VO

Over Current 125% Io,max

Protection

Over Voltage 125% Vo, nom

Protection

Over Temperature 110 °C

Protection

Safety

UL + cUL 60950-1, Recognized

EN60950-1 through TUV-PS

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 2 OF 13

JANUARY 28, 2008 - REVISION 01

Electrical Specifications

ABSOLUTE MAXIMUM RATI NG S

Stresses in excess of the absolute maximum ratings can cause permanent damage to the converter. Functional operation of the

device is converter is not implied at these or any other conditions in excess of those given in the operational section of the

specs. Exposure to absolute maximum ratings for extended period can adversely affect device reliability.

Parameter Device Symbol Min Typical Max Unit

Input Voltage

Continuous

Transient (100ms)

All

Vin

Vin trans

-0.3

100

Vdc

I/O Isolation

Input-to-Output

All

1500

Vdc

Operating Temperature

All TA -40 - 85 ºC

Storage Temperature

All TSTG -55 - 125 ºC

Operating Humidity

All - 10 - 85 %

Max Voltage at Enable Pin

All -0.6 - 25 Vdc

Max Output Power

F (3.3V) PO,MAX - - 66 W

INPUT SPECIFICATION

Parameter Device Symbol Min Typical Max Unit

Operating Input Voltage Range All VIN 19 24/48 60 Vdc

Input Under- Voltage Lock-out

T_ON Threshold

T_OFF Threshold

All

18.5

16.0

18.4

Vdc

Max Input Current1

F (3V3) Iinmax - - 4.5 A

Standing Loss

All - 1.5 3 W

Input Ripple Current2

All II1 - 10 30 mAp-p

External Input Bypass Cap All CIN 220 µF

Note: 1. Module is not internally fused. External fuse is recommended (e.g. Littlefuse® 465 Series / 1.5 x IIN,MAX typical).

2. See Figure 1 for the input ripple current test setup.

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 3 OF 13

JANUARY 28, 2008 - REVISION 01

Electrical Specifications (continued)

OUTPUT SPECIFICATIONS

Parameter Device Symbol Min Typical Max Unit

Output Voltage Set point

IN = VIN,MIN to VIN,MAX

O = IO,MAX

F (3V3) VO,SET 3.2 3.30 3.36 Vdc

Output Regulation

Line

IN = VIN,MIN to VIN,MAX

Load

IN = VIN,NOM

O = IO,MIN to IO,MAX

Temp

IN = VIN,NOM; IO = IO,MAX

a = -40 ºC to 85 ºC

All

0.1

0.25

0.5

Output Ripple and Noise3

Peak-to-Peak

O = IO,MAX; VIN =VIN,NOM;

BWL = 20 MHz; TA =25 oC

F (3V3) - - 50

100 mVp-p

Output Current4

F (3V3)

IO 0 - 20

Output Current-limit Inception5

VO = 90% VO,NOM; TA = 25 ºC

IN = VIN,NOM

Non-latching / auto-recovery

F (3V3)

IO,OCP 22 - 30.5 A

External Load Capacitance

O = IO,MAX , resistive load

ESR

F (3V3)

CEXT

10,000

µF

mΩ

Efficiency

IN = VIN,NOM; IO = IO,MAX

TA = 25 ºC;

F (3.3V)

88.5

Output Over Voltage Protection5

Non-latching / autorecovery F (3.3V) VO,OVP 3.9 4.1 4.7 V

Over Temperature Protection

Autorecovery

All

110

120

°C

Input to Output Turn- On Delay

IN = VIN,NOM, IO = IO,MAX All - - - 15 ms

Enable to Output Turn-On Delay

IN = VIN,NOM, IO = IO,MAX All - - - 15 ms

Switching Fre q uency All FSW 340 400 460 kHz

Output Voltage Remote Sensing6 All - - - 10 %VO

Output Voltage Trim Range7 All 90 110 %VO

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 4 OF 13

JANUARY 28, 2008 - REVISION 01

Electrical Specifications (continued)

OUTPUT SPECIFICATIONS

Parameter Device Symbol Min Typical Max Unit

Dynamic Response

di/dt = 0.1 A/µs

Peak Deviation

∆IO = 50% to 75% of Iomax

Settling Time

Vref = Vonom

Peak Deviation

∆IO = 50% to 25% of Iomax

Settling Time

Vref = Vonom

All

200

µs

Output Enable ON/ OFF

Open collector TTL compatible

Positive Enable: Mod-ON

Mod-OFF

Negative Enable: Mod-ON

Mod-OFF

All

2.95

-0.50

2.95

1.20

Note: 3. See Figure 2 for the Output Ripple and Noise Test Measurement Setup.

4. Output derating applies at elevated temperature. See Figures 16 and 17.

5. OCP and OVP are both auto-recovery. The converter will shutdown and attempt to restart until the fault is removed. There is

a 25ms lockout period between restart attempts. Note also that the OCP threshold will be reduced proportionally with output

voltage trim up and/or remote sense compensation. The percent rise in output voltage will be proportional to the reduction in

OCP current limit inception.

6. The sense pins can be used to compensate for any voltage drops (per indicated max limits) that may occur along

the connection between the output pins to the load. Pin 7 (+Sense) and Pin 5 (-Sense) should be connected to Pin

8 (+Vout) and Pin 4 (Return) respectively at the point where regulation is desired.

7. See Equation 1 and 2 for the output trim function. The combination of remote sense and trim adjust cannot exceed 100% Vo.

Whenever the output voltage is increased, the output current must be derated so as not to exceed the maximum output power.

8. Minimum Enable pin disable time is 100ms. Shorter disable durations may cause output to overshoot beyond specification

upon restart (Enable On).

SAFETY AGENCY / MATERIAL RATING / ISOLATION

Parameter Device

Safety Approval All UL/cUL 60950-1, 3rd Edition – Recognized

EN 60950-1 through TUV

Material Flammability Rating All UL94V-0

Parameter Device Symbol Min Typical Max Unit

Input to Output Capacitance All - 1 000 - pF

Input to output Resistance All - 10 - Mohms

Input to Output Insulation Type All - Basic - -

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 5 OF 13

JANUARY 28, 2008 - REVISION 01

Electrical Specifications (continued)

ure 2. Peak to Peak Out

ut Noise Measurement Setu

Figure 1. Input Reflected Ripple Current Measurement Setup.

Vo(+)

Vo(-)

RESISTIVE

LOAD

10 uF0.1 uF SCOPE

COPPER STRIP

Use a 0.1

F @50V X7R ceramic capacitor (connected an inch away from the outpu

terminals of the UUT) and a 10µF @ 25V tantalum capacitor (2 inches away fro

the output terminals of the UUT). Scope measurement should be made using a BNC

socket

ositioned 3 inches awa

from out

ut terminals of the converter.

BATTERY Cs 220 uF

ESR < 0.1 OHM

@ 20 ºC, 100 kHz

Ltest

12 uH

33 uF

ESR < 0.7 OHM

@ 20 ºC, 100 kHz

Vi(+)

Vi(-)

TO OSCILLOSCOPE

Measure input reflected-ripple current with a simulated source inductance (Ltest) o

12 uH. Capacitor Cs offsets possible battery impedance. Measure current as show

above.

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 6 OF 13

JANUARY 28, 2008 - REVISION 01

+Vin

-Vin

Enable

-Vout

+Vout

-Sense

+Sense

Vadj Rload

Rad

_up

Figure 3. External resistor configuration to increase the outputs

+Vin

-Vin

Enable

-Vout

+Vout

-Sense

+Sense

Vadj Rload

Radj_down

Figure 4. External resistor configuration to increase the outputs

Basic Operation and Features

INPUT UNDER VOLTAGE LOCKOUT

To prevent any instab ility to the converter, which may affect the end syste m, the converter have been designed to turn-on once VIN is

in the voltage range of 18.5-20.0 VDC. Likewise, it has also been programmed to turn-off when VIN drops down to 16.0-18.4 VDC.

OUTPUT VOLTAGE ADJUST/TRIM

The converter comes with a TRIM pin (PIN 6), which is used to adjust the output by as much as 90% to 110% of its set point. This is

achieved by connecting an external resistor as described below.

To INCREASE the output, external Radj_up resistor should be

connected between TRIM PIN (Pin6) and +SENSE PIN (Pin 7).

Please refer to Equation (1) for the required external resistance

and output adjust relationship.

Equation (1a):

To DECREASE the output, external Radj_down resistor should be

connected between TRIM pin (Pin 6) and

-SENSE PIN (Pin 5). Please refer t o Equatio n (2 ) fo r the required

external resistance and ou tput adjust relationship.

Equation (2):

Where: ∆% = percent change in output voltage:

OUTPUT ENABLE

The converter comes with an Enable pin (PIN 2), which is primarily used to turn ON/OFF the converter. Both a Positive (no “N”

suffix required) and a Negative (suffix “N” required) Enable Logic options are being offered. Please refer to Table 2 for the Part

Numbering Sc heme.

For Positive Enable, the converter is turned on when the Enab le pin is at logic HIGH or left open. The unit turns off when the Enable

pin is at logic LOW or directly connected to -VIN. On the other hand, the Negative Enable version turns unit on when the Enable pin is

at logic LOW or directly connected to -VIN. The unit turns off when the Enable pin is at Logic HIGH.

Radj_down 510

∆%10.2−

⎛

⎜

⎝

⎞

⎠

kΩ⋅

Radj_up

5.1 Voset

×100 ∆%+

(

)

1.225 ∆%×

510

∆%

−10.2−

⎡

⎢

⎣

⎤

⎥

⎦

=ΚΩ

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 7 OF 13

JANUARY 28, 2008 - REVISION 01

Basic Operation and Features (continued)

OUTPUT OVER VOLTAGE PROTECTION (OVP)

The Over Voltage Protection circuit is non-latching - auto recov ery mode . The output of the converter is terminated under an OVP

fault condition (Vo > OVP threshold). The converter will attempt to restart until the fault is removed. There is a 25ms lockout period

between restart attempts.

OVER CURRENT PROTECTION (OCP)

The Over Current Protection is non-latching - auto recovery mode. The converter shuts down once the output current reaches the OCP

range. The converter will attempt to restart until the fault is removed. There is a 25ms lockout period between restart attempts.

OVER TEMPERATURE PROTECTION (OTP)

The Over Temperature Protection circuit will shutdown the converter once the average PCB temperature (See Figure 90B for OTP

reference sense point) reaches the OTP range. This feature prevents the unit from overh eating and consequently go ing into thermal

runaway, which may further damage the converter and the end system. Such overheating may be an effect of operation outside the

given power thermal derating conditions. Restart is possible once the temperature of the sensed location drops to less than 110°C.

REMOTE SENSE

The remote sense pins can be used to compensate for any voltage drops (per indicated max limits) that may occur along the connection

between the output pins to the load. Pin 7 (+Sense) and Pin 5 (-Sense) should be connected to Pin 8 (+Vout) and Pin 4 (Return)

respectively at the point where regulation is desired. The combination of remote sense and trim adjust cannot exceed 110% of VO.

When output voltage is trimmed up (through remo te sensing and/or trim pin), output current must be derated and maximum output

power must not be exceeded.

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 8 OF 13

JANUARY 28, 2008 - REVISION 01

Performance Curves

Efficiency vs. Output Current, T

=25°C

55%

60%

65%

70%

75%

80%

85%

90%

95%

0 5 10 15 20

Output Current [A]

Efficiecny [%

]

Vin = 20Vdc

Vin = 36Vdc

Vin = 60Vdc

P ower Dissipation vs. O utput Curtret, TA=25°C

0 5 10 15 20

Output Current [A]

Power Dissipation [

Vin = 20 Vdc

Vin = 36 Vdc

Vin = 60 Vdc

Efficiency vs. Output Current, T

=85°C

55%

60%

65%

70%

75%

80%

85%

90%

95%

0 5 10 15 20

Output Current [A]

Efficiency [%

]

Vin = 20 Vdc

Vin = 36 Vdc

Vin = 60 Vdc

Power Dissipation vs. Output Current, T

=85°C

0 5 10 15 20

Output Current [A]

Power Dissipation [

Vin = 20 Vdc

Vin = 36 Vdc

Vin = 60 Vdc

Figure 6. Efficiency vs. Load current at various line

voltages, TA = 25°C. Figure 7. Power Dissipation vs. Load current at various line

voltages, TA = 25°C.

Figure 8. Efficiency vs. Load current at various line

voltages, TA = 85°C. Figure 9. Power Dissipation vs. Load current at various line

voltages, TA = 85°C.

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 9 OF 13

JANUARY 28, 2008 - REVISION 01

Performance Curves

Figure 10. Output st art u p (C H1 ) at VIN = 36Vdc, IO = 20A,

CO = 10µF, TA = 25°C. Figure 11. Output ri p pl e at VIN = 36Vdc, IO = 20A, TA =

25°C. See Fig 2 for test setup.

Figure 12. Output transient response (CH1) at VIN = 36Vdc,

25% to 50% step change, TA = 25°C, CO = 10µF. Figure 13. Output transient response (CH1) at VIN = 36Vdc,

25% to 50% step change, TA = 25°C, CO = 10µF.

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 10 OF 13

JANUARY 28, 2008 - REVISION 01

Performance Curves

Figure 17. Output c u rrent vs. ambi ent temperature, VIN =

48Vdc (TJ ≤ 120°C).

Figure 14. Enable to output turn on characteristic. VIN = 36V,

TA = 25°C. Figure 15. Typical application circuit.

Output Current vs. Temperature

25 40 55 70 85

Ambient Temperature [°C]

Current [A

]

0 LFM (0 m/s)

100 LFM (0. 5 m/s)

200 LFM (1 m/s)

400 LFM (3 m/s)

Figure 16. Output c u rrent vs. ambi ent temperature, VIN =

24Vdc (TJ ≤ 120°C).

Output Current vs. Temperature

25 40 55 70 85

Ambient Temperature [C]

Current [A

]

0 LFM (0 m/s)

100 LFM (0. 5 m/s)

200 LFM (1 m/s)

400 LFM (3 m/s)

+Vin

-Vin

+Vo

-Vo

TO SOURCE

220uF 0.1uF 10uF

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 11 OF 13

JANUARY 28, 2008 - REVISION 01

Input Filter for FCC Class B Conducted Noise

A reference design for an input filter that can provide FCC Class B conducted noise levels is shown below (See Figure 18). Two

common mode connected inductors are used in the circuit along with balanced bypass capacitors to shunt common mode currents into

the ground plane. Shunting noise current back to the converter reduces the amount of energy reaching the input LISN for

measurement.

The application circuit shown has an earth ground (frame ground) connected to the converter output (-) terminal. Such a configuration

is common practice to accommodate safety agency requirements. Grounding an output terminal results in much higher conducted

emissions as measured at the input LISN because a hard path for common mode current back to the LISN is created by the frame

ground. “Floating” loads generally result in much lower measured emissions. The electrical equivalent of a floating load, for EMI

measurement purposes, can be created by grounding the converter output (load) through a suitably sized inductor(s) while maintaining

the necessary safety bonding.

Figure 18: Class B Filter Circuit

PARTS LIST

CKT CODE DESCRIPTION

Common

Mode Choke

CTX01-15091

Cooper Electronic

Technologies

X-Cap 0.47 µF X 4pcs

Y-Cap 22 nF X 4 pcs

CIN 220 uF

FILTER

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 12 OF 13

JANUARY 28, 2008 - REVISION 01

0.90

[22.9]

2.30

[58.4]

PIN SIDE DOWN

- Vin

+Vin

-Sense

Trim

+Sense

-Output

+Output

0.32

[8.2]

2.00

[50.8]

0.15

[3.8]

0.30

[7.6]

0.45

[11.4] 0.60

[15.2] 0.75

[19.0]

0.15

[3.8]

0.45

[11.4]

0.75

[19.0]

Mechanical Specifications

Parameter Device Symbol Min Typ Max Unit

Dimension All L

2.28 [57.91] 2.30 [58.4] 2.32 [58.9] in [ mm ]

0.88 [22.35] 0.90 [22.9] 0.92 [23.36] in [ mm ]

0.38 [9.65] 0.40 [10.1] 0.42 [10.66] in [ mm ]

Weight All - 22.68 [0.8] - g [oz]

PIN ASSIGNMENT

1 +VIN 5 -SENSE

2 ENABLE 6 TRIM

3 -VIN 7 +SENSE

4 -Vo 8 +Vo

Figure 19. Mechanical Outline

OTP Reference Sense

Point: Vicinity of Pin

2- Enable Pin

Technical Reference Notes

ALO20F36 Series

(Single Output 8th Brick)

MODEL: ALO20F36 SERIES SHEET 13 OF 13

JANUARY 28, 2008 - REVISION 01

Mechanical Specifications

SOLDERING CONSIDERATIONS

The RoHS-compliant terminal pin finish of the converter are compatible with both Pb and Pb-free wave soldering techniques. The

modules are recommended to be preheated for 20-30 sec at 110°C and wave soldered at 260°C for Pb solder and 27 0°C max for Pb-

free solder, for less than 10 sec.

TABLE 2: PART NUMBERING SCHEME

O/P Current O/P Voltage I/P Voltage Enable Logic PIN Length RoHS

ALO 20 F 36 N - 6 L

20 A F = 3.3 V 19 – 60 Vdc N = Negative Logic

BLANK = Positive

Logic

6 = 3.7mm nom

Blank = 5mm

nom (default)

L = RoHS 6

Blank = RoHS 5

Note: 1) For Through Hole termination: - Std pin length is 5mm nominal (min: 0.189 [4.8]; max: 0.205 [5.2] / in [mm])

- “-6” option is 3.7mm nominal (min: 0.137 [3.5]; max: 0.152 [3.9] / in [mm])

- Pins 4&8 diameter: ∅ = 0.062 [1.57], others: ∅ = 0.04 [1.0] (6X)

For further inquiries, please contact:

techincalsupport@astec.com

techinicalsupport@artesyn.com

USA: 1-888-41-ASTEC

EUROPE: (44) 0800-0321546