January 2010 Doc ID 4946 Rev 6 1/12
12
L6571
High voltage half bridge driver with oscillator
Features
■High voltage rail up to 600 V
■BCD off line technology
■15.6 V Zener clamp on Vs
■Driver current capability:
– Sink current = 270 mA
– Source current = 170 mA
■Very low start up current: 150 mA
■Undervoltage lockout with hysteresis
■Programmable oscillator frequency
■Dead time 1.25 μs (L6571A) or 0.72 μs
(L6571B)
■dV/dt immunity up to ±50 V/ns
■ESD protection
Description
The device is a high voltage half bridge driver with
built in oscillator. The frequency of the oscillator
can be programmed using external resistor and
capacitor.
The internal circuitry of the device allows it to be
driven also by external logic signal.
The output drivers are designed to drive external
nchannel power MOSFET and IGBT. The internal
logic assures a dead time to avoid cross-
conduction of the power devices.
Two version are available: L6571A and L6571B.
They differ in the internal dead time: 1.25μs and
0.72 μs (typ.)
DIP-8 SO8
Figure 1. Block diagram
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Contents L6571A - L6571B
2/12 Doc ID 4946 Rev 6
Contents
1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Oscillator frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Order information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
L6571A - L6571B Maximum ratings
Doc ID 4946 Rev 6 3/12
1 Maximum ratings
1.1 Absolute maximum ratings
Note: ESD immunity for pins 6, 7 and 8 is guaranteed up to 900 V (human body model)
1.2 Thermal data
1.3 Recommended operating conditions
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
IS (1)
1. The device has an internal zener clamp between GND and VS (typical 15.6 V).Therefore the circuit should
not be driven by a DC low impedance power source.
Supply current 25 mA
VCF Oscillator resistor voltage 18 V
VLVG Low side switch gate output 14.6 V
VOUT High side switch source output -1 to VBOOT -18 V
VHVG High side switch gate output -1 to VBOOT V
VBOOT Floating supply voltage 618 V
VBOOT/OUT Floating supply vs OUT voltage 18 V
dVBOOT/dt VBOOT slew rate (Repetitive) ± 50 V/ns
dVOUT/dt VOUT slew rate (Repetitive) ± 50 V/ns
Tstg Storage temperature -40 to 150 °C
TJ Junction temperature -40 to 150 °C
Tamb Ambient temperature (Operative) -40 to 125 °C
Table 2. Thermal data
Symbol Parameter MDIP8 SO8 Unit
RthJA Thermal resistance junction-ambient max 100 150 °C/W
Table 3. Recommended operating conditions
Symbol Parameter Min. Max. Unit
VS Supply voltage 10 VCL V
VBOOT Floating supply voltage - 500 V
VOUT High side switch source output -1 VBOOT
-VCL V
fout Oscillation frequency 200 kHz
Pin connection L6571A - L6571B
4/12 Doc ID 4946 Rev 6
2 Pin connection
Figure 2. Pin connection
Table 4. Pin description
N° Pin Description
1 VS Supply input voltage with internal clamp [typ. 15.6V]
2 RF
Oscillator timing resistor pin. A buffer set alternatively to VS and GND can provide
current to the external resistor RF connected between pin 2 and 3. Alternatively,
the signal on pin 2 can be used also to drive another IC (i.e. another L6569/71 to
drive a full H-bridge)
3 CF
Oscillator timing capacitor pin. A capacitor connected between this pin and GND
fixes (together with RF) the oscillating frequency Alternatively an external logic
signal can be applied to the pin to drive the IC.
4 GND Ground
5 LVG
Low side driver output. The output stage can deliver 170mA source and 270mA
sink [typ.values].
6 OUT Upper driver floating reference
7 HVG
High side driver output. The output stage can deliver 170mA source and 270mA
sink [typ.values].
8 BOOT Bootstrap voltage supply. It is the upper driver floating supply.
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L6571A - L6571B Electrical data
Doc ID 4946 Rev 6 5/12
3 Electrical data
VS = 12V; VBOOT - VOUT = 12V; Tj = 25 °C; unless otherwise specified.
Table 5. Electrical characteristcs
Symbol Pin Parameter Test Condition Min. Typ. Max. Unit
VSUVP 1 VS turn on threshold 8.3 9 9.7 V
VSUVN VS turn off threshold 7.3 8 8.7 V
VSUVH VS hysteresis 0.7 1 1.3 V
VCL VS clamping voltage IS = 5 mA 14.6 15.6 16.6 V
ISU Start up current VS < VSUVN 150 250 μA
Iq Quiescent current VS > VSUVP 500 700 μA
IBOOTLK 8 Leakage current BOOT pin vs GND VBOOT = 580V 5 μA
IOUTLK 6 Leakage current OUT pin vs GND VOUT = 562V 5 μA
IHVG SO 7 High side driver source current VHVG = 6V 110 175 mA
IHVG SI High side driver sink current VHVG = 6V 190 275 mA
ILVG SO 5 Low side driver source current VLVG = 6V 110 175 mA
ILVG SI Low side driver sink current VLVG = 6V 190 275 mA
VRFON 2 RF high level output voltage IRF =1mA VS -0.05 VS -0.2 V
VRF OFF RF low level output voltage IRF = -1mA 50 200 mV
VCFU 3 CF upper threshold 7.7 8 8.2 V
VCFL CF lower threshold 3.80 4 4.3 V
td Internal dead time L6571A
L6571B
0.85
0.50
1.25
0.72
1.65
0.94
μs
μs
DC
Duty cycle, ratio between dead
Time + conduction time of high
Side and low side drivers
0.45 0.5 0.55
IAVE 1 Average current from Vs No Load, fs = 60KHz 1.2 1.5 mA
fout 6 Oscillation frequency RT = 12K; CT = 1nF 57 60 63 kHz
Oscillator frequency L6571A - L6571B
6/12 Doc ID 4946 Rev 6
4 Oscillator frequency
The frequency of the internal oscillator can be programmed using external resistor and
capacitor.
The nominal oscillator frequency can be calculated using the following equation:
Equation 1
Where RF and CF are the external resistor and capacitor.
The device can be driven in "shut down" condition keeping the CF pin close to GND, but
some cares have to be taken:
1. When CF is to GND the high side driver is off and the low side is on
2. The forced discharge of the oscillator capacitor CF must not be shorter than 1us: a
simple way to do this is to limit the current discharge with a resistive path imposing
R · CF > 1 μs (see fig.1)
Figure 3. Fault signal
Figure 4. Waveforms
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L6571A - L6571B Oscillator frequency
Doc ID 4946 Rev 6 7/12
Figure 5. Typical dead time vs. temperature
dependency (L6571A)
Figure 6. Typical rise and fall times vs. load
capacitance
Figure 7. Typical frequency vs temperature
dependency
Figure 8. Quiescent current vs. supply
voltage
Figure 9. Typical and theoretical oscillator
frequency vs resistor value
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Package mechanical data L6571A - L6571B
8/12 Doc ID 4946 Rev 6
5 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 10. DIP-8 mechanical data
OUTLINE AND
MECHANICAL DATA
DIM.
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A3.32 0.131
a1 0.51 0.020
B 1.15 1.65 0.045 0.065
b 0.356 0.55 0.014 0.022
b1 0.204 0.304 0.008 0.012
D 10.92 0.430
E 7.95 9.75 0.313 0.384
e2.54 0.100
e3 7.62 0.300
e4 7.62 0.300
F 6.6 0.260
I 5.08 0.200
L 3.18 3.81 0.125 0.150
Z 1.52 0.060
DIP-8
L6571A - L6571B Package mechanical data
Doc ID 4946 Rev 6 9/12
Table 1. SO-8 mechanical data
Dim.
mm. inch
Min Typ Max Min Typ Max
A 1.35 1.75 0.053 0.069
A1 0.10 0.25 0.004 0.010
A2 1.10 1.65 0.043 0.065
B 0.33 0.51 0.013 0.020
C 0.19 0.25 0.007 0.010
D (1)
1. Dimensions D does not include mold flash, protru-sions or gate burrs. Mold flash, potrusions or gate burrs
shall not exceed 0.15mm (.006inch) in total (both side).
4.80 5.00 0.189 0.197
E 3.80 4.00 0.15 0.157
e 1.27 0.050
H 5.80 6.20 0.228 0.244
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
k 0° (min.), 8° (max.)
ddd 0.10 0.004
Figure 11. Package dimensions
Order information L6571A - L6571B
10/12 Doc ID 4946 Rev 6
6 Order information
Table 6. Ordering information
Order codes Package Packaging
L6571A DIP-8 Tu b e
L6571AD SO8
L6571AD013TR Tape and reel
L6571B DIP-8 Tu b e
L6571BD SO8
L6571BD013TR Tape and reel
L6571A - L6571B
12/12 Doc ID 4946 Rev 6
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