TAIYO YUDEN
LS720A-RH
Model
LCD Backlight Driver
Input Specifications*
Item Condition Standard
Input Voltage
Rated — 12 Vdc
Tolerance Continuous Operation 10.8 Vdc - 13.2 Vdc
Starting Condition (Discharge Starting Voltage) 10.8 Vdc - 13.2 Vdc
Max. Input Current VIN = 10.8 Vdc 1.0 A
Luminance @ Max.
Max. Input Power VIN = 12 Vdc 12 W
Luminance @ Max.
On/Off Input Current On
VCONT = 2.0-Vcc Vdc IMAX = 4.0 mA
Off
VCONT = -0.3 Vdc to +0.8 Vdc IMAX = 50 µA
DC-Bright IOUT = Max 3.8 V
IOUT = Min 2.0 V
PWM Bright Duty Ratio tON / tBC Max 1.00
tON / tBC Min 0.30
PWM Bright Pulse Frequency 1 / tBC 400 Hz
380 ~ 420 Hz
*Above Specifications Occur @ 25 ± 5ºC
12 Volt Input
Dual Tube CCFT Inverter (8W)
Brightness Control (PWM Dimming 20-100%)
Output Specifications*
Item Condition Standard
MIN TYP MAX
Output Voltage (Vrms) VIN = 10.8 Vdc 1500 1650 —
Tube Current for 2 Lamps (mArms) Luminance @ Max.(VIN = 12.0 Vdc) 10.4 12.0 13.6
Luminance @ Min. (VIN = 12.0 Vdc) — 7.0 —
Max. Power Output for 2 Lamps (W) VIN = 12 Vdc/Luminance @ Max. — — 8.0
Ignition Frequency (kHz) Luminance @ Min.-Max., VIN = 12.0 Vdc 50 60 70
*Above specifications occur @ 25 ± 5ºC & VIN = 10.8 - 13.2 Vdc.
Physical Specifications
Dimensions: 25mm x 125mm x 10mm
(0.98" x 4.92" x 0.39")
Operating Temp: 0 to 60°C, convection cooling
Relative Humidity: 20% to 90%, non-condensing
Storage: -20 to 80°C/5-95% RH
Impact Resistance: 50G half wave per 2 msec
Vibration Resistance: 10-55-10 Hz/min @ 1.5mm
RoHS
COMPLIANT
LS720A-RH
Model
Luminance Variance
Item Condition DC Bias Control Output Current
Luminance @ Max. Btwn. pin 4 & 6 Vcont = 3.8 V 12 mA (2 lamps)
Luminance @ Min. Btwn. pin 4 & 6 Vcont = 2.0 V 6.5 mA (2 lamps)
* Luminance can also be controlled by applying PWM signal to pin 5 (pin 4 must be connected to GND).
CN2
16 (0.630)
125 (4.921)
CN1
25 (0.984)
25 (0.984)
10 (0.394)
10MAX
(0.394MAX)
1.0TYP
(0.039TYP)
2–ø2.8 (0.110)
ø6.6 (0.260)
2-R5
(0.197)
4 (0.157)
No Pattern and No Componet Area (except GND pattern)
Units: mm (inches)
GND Pattern Area
4 (0.157)
1
8
1
4
1
2
3
V(in)
V(in)
GND
1
2
3
4
CCFT HIGH
CCFT HIGH
CCFT LOW
NC
CN1 Input Connector
Hirose DF13-8P-1.25H
(pin number 8 is
marked on PCB)
CN1 Corresponding Housing
Hirose DF13-8S-1.25C
(Hirose Connector Pin Numbers)
CN2 Corresponding Housing
JST BHR-04VS-1
CN2 Output Connector
JST SM03 (7-D1) B-BHS-1-TB(LF)
4
5
6
GND
On/Off
Bright DC
Bright PWM
7
8
S-GNG
V(in)
V(in)
GND
GND
On/Off
Bright DC
Bright PWM
S-GNG
8
7
6
5
4
3
2
1
FM 32227
© Copyright 2007 TAIYO YUDEN (U.S.A.), INC. Specifications subject to change without notice.
TAIYO YUDEN (U.S.A.), INC.
440 Stevens Avenue, Suite 300 Solana Beach, CA 92075
(858) 350-6800 / Fax: (858) 350-6854
(800) 263-4532
www.t-yuden.com inverters@t-yuden.com
Connection Diagram
INVERTER
1
2
3
V(in)
V(in)
GND
1
2
3
4
CCFT HIGH
CCFT HIGH
CCFT LOW
NC
Input Connector CN1
Hirose DF13-8P-1.25H
Corresponding Housing:
Hirose DF13-8S-1.25C
Corresponding Housing:
JST BHR-04VS-1
Output Connector CN2
JST SM03 (7-D1) B-BHS-1-TB(LF)
4
5
6
GND
On/Off
DC Bright
PWM Bright
7
8
S-GNG
12 Vdc
2~3.8 Vdc
2~Vcc/0 Vdc CCFT
INVERTER
1
2
3
V(in)
V(in)
GND
1
2
3
4
CCFT HIGH
CCFT HIGH
CCFT LOW
NC
Input Connector CN1
Hirose DF13-8P-1.25H
Corresponding Housing:
Hirose DF13-8S-1.25C
Corresponding Housing:
JST BHR-03VS-1
Output Connector CN2
JST SM03 (7-D1) B-BHS-1-TB(LF)
4
5
6
GND
On/Off
DC Bright
PWM Bright
7
8
S-GNG
12 Vdc
Oscillator
5 V
0 V
ton
ton / tbc = 0.3~1.0
tbc
2~Vcc/0 Vdc CCFT
LS720A-RH
DC Bright Control Connection PWM Bright Control Connection
DC Bright Control Method
Maximum output current can be adjusted by applying bias
voltage between brightness control pins as shown below.
16.00
14.00
12.00
10.00
8.00
6.00
Lamp Current
4.00
2.00
0.00
1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4
DC Bias (Vdc)
DC Lamp
Bias Current
(2 lamps)
2.0 V 6.88 mA
2.2 V 7.86 mA
2.4 V 8.60 mA
2.6 V 9.25 mA
2.8 V 9.88 mA
3.0 V 10.40 mA
3.2 V 11.00 mA
3.4 V 11.80 mA
3.6 V 12.10 mA
3.8 V 12.10 mA
4.0 V 12.10 mA
The inverter is ON if one of the following conditions are met:
• Pin 3 (On/Off) is connected to pin 1/2 (VIN)
• Pin 3 (On/Off) = 2 Vdc —13.2 Vdc
The inverter is OFF if one of the following conditions are met:
• Pin 3 (On/Off) is connected to pin 7/8 (GND)
• Pin 3 (On/Off) ≤0.8 Vdc
On/Off Control
LS720A-RH
Model
Tech Notes
* Above specifications occur @ 25 ± 5ºC, with pin 5 connected to GND,
and V
IN
= 12 Vdc using NEC NL panel.
preset to
maximum brightness
(continuous)
FM 32227
© Copyright 2007 TAIYO YUDEN (U.S.A.), INC. Specifications subject to change without notice.
TAIYO YUDEN (U.S.A.), INC.
440 Stevens Avenue, Suite 300 Solana Beach, CA 92075
(858) 350-6800 / Fax: (858) 350-6854
(800) 263-4532
www.t-yuden.com inverters@t-yuden.com
