TAIYO YUDEN
LS720A-RH
RoHS
Model
LCD Backlight Driver
12 Volt Input
Dual Tube CCFT Inverter
Brightness Control
(8W)
COMPLIANT
(PWM Dimming 20-100%)
Physical Specifications
Dimensions:
Operating Temp:
Relative Humidity:
Storage:
Impact Resistance:
Vibration Resistance:
25mm x 125mm x 10mm
(0.98" x 4.92" x 0.39")
0 to 60°C, convection cooling
20% to 90%, non-condensing
-20 to 80°C/5-95% RH
50G half wave per 2 msec
10-55-10 Hz/min @ 1.5mm
Input Specifications*
Item
Condition
Standard
Input Voltage
Rated
Tolerance
Max. Input Current
Max. Input Power
On/Off Input Current
—
Continuous Operation
Starting Condition (Discharge Starting Voltage)
V
IN
= 10.8 Vdc
Luminance @ Max.
V
IN
= 12 Vdc
Luminance @ Max.
On
V
CONT
= 2.0-Vcc Vdc
Off
V
CONT
= -0.3 Vdc to +0.8 Vdc
12 Vdc
10.8 Vdc - 13.2 Vdc
10.8 Vdc - 13.2 Vdc
1.0 A
12 W
I
MAX
= 4.0 mA
I
MAX
= 50 µA
3.8 V
2.0 V
1.00
0.30
400 Hz
380 ~ 420 Hz
DC-Bright
PWM Bright Duty Ratio
PWM Bright Pulse Frequency
*Above Specifications Occur @ 25 ± 5ºC
I
OUT
= Max
I
OUT
= Min
t
ON
/ t
BC
Max
t
ON
/ t
BC
Min
1 / t
BC
Output Specifications*
Item
Condition
Standard
MIN
TYP
MAX
Output Voltage (Vrms)
Tube Current for 2 Lamps (mArms)
Max. Power Output for 2 Lamps (W)
Ignition Frequency (kHz)
V
IN
= 10.8 Vdc
Luminance @ Max.(V
IN
= 12.0 Vdc)
Luminance @ Min. (V
IN
= 12.0 Vdc)
V
IN
= 12 Vdc/Luminance @ Max.
Luminance @ Min.-Max., V
IN
= 12.0 Vdc
1500
10.4
—
—
50
1650
12.0
7.0
—
60
—
13.6
—
8.0
70
*Above specifications occur @ 25 ± 5ºC & V
IN
= 10.8 - 13.2 Vdc.
Model
LS720A-RH
Luminance Variance
Item
Condition
DC Bias Control
Output Current
Luminance @ Max.
Luminance @ Min.
Btwn. pin 4 & 6
Btwn. pin 4 & 6
Vcont = 3.8 V
Vcont = 2.0 V
12 mA (2 lamps)
6.5 mA (2 lamps)
* Luminance can also be controlled by applying PWM signal to pin 5 (pin 4 must be connected to GND).
125 (4.921)
10 (0.394)
1
ø6.6 (0.260)
25 (0.984)
4 (0.157)
1
CN1
8
2–ø2.8 (0.110)
16 (0.630)
4 (0.157)
2-R5
(0.197)
CN2
4
25 (0.984)
10MAX
(0.394MAX)
No Pattern and No Componet Area (except GND pattern)
GND Pattern Area
CN1 Input Connector
Hirose DF13-8P-1.25H
(pin number 8 is
marked on PCB)
V(in)
V(in)
On/Off
Bright DC
Bright PWM
S-GNG
GND
GND
1
2
3
4
5
6
7
8
CN1 Corresponding Housing
Hirose DF13-8S-1.25C
(Hirose Connector Pin Numbers)
8
7
6
5
4
3
2
1
V(in)
V(in)
On/Off
Bright DC
Bright PWM
S-GNG
GND
GND
CN2 Output Connector
JST SM03 (7-D1) B-BHS-1-TB(LF)
CCFT
HIGH
1
2
CCFT
HIGH
3
NC
4
CCFT
LOW
CN2 Corresponding Housing
JST BHR-04VS-1
© 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
1.0TYP
(0.039TYP)
Units: mm (inches)
FM 32227
Model
LS720A-RH
Tech Notes
Connection Diagram
LS720A-RH
DC Bright Control Connection
Input Connector CN1
Hirose DF13-8P-1.25H
1
2
3
4
5
6
7
8
V(in)
V(in)
On/Off
DC Bright
PWM Bright
S-GNG
GND
GND
Output Connector CN2
JST SM03 (7-D1) B-BHS-1-TB(LF)
CCFT
HIGH
1
2
CCFT
HIGH
CCFT
3
NC
4
CCFT
LOW
Corresponding Housing:
JST BHR-04VS-1
PWM Bright Control Connection
Input Connector CN1
Hirose DF13-8P-1.25H
1
2
3
4
5
6
7
8
5V
0V
t
on
t
bc
2~Vcc/0 Vdc
12 Vdc
2~Vcc/0 Vdc
12 Vdc
2~3.8 Vdc
Oscillator
V(in)
V(in)
On/Off
DC Bright
PWM Bright
S-GNG
GND
GND
Output Connector CN2
JST SM03 (7-D1) B-BHS-1-TB(LF)
CCFT
HIGH
1
2
CCFT
HIGH
CCFT
3
NC
4
CCFT
LOW
Corresponding Housing:
JST BHR-03VS-1
Corresponding Housing:
Hirose DF13-8S-1.25C
DC Bright Control Method
Maximum output current can be adjusted by applying bias
voltage between brightness control pins as shown below.
Lamp Current
* Above specifications occur @ 25 ± 5ºC, with pin 5 connected to GND,
and V
IN
= 12 Vdc using NEC NL panel.
INVERTER
Corresponding Housing:
Hirose DF13-8S-1.25C
INVERTER
t
on
/ t
bc =
0.3~1.0
DC
Bias
Lamp
Current
(2 lamps)
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
16.00
14.00
12.00
10.00
8.00
6.00
4.00
2.00
0.00
1.8
2
V
V
V
V
V
V
V
V
V
V
V
6.88 mA
7.86 mA
8.60 mA
9.25 mA
9.88 mA
10.40 mA
11.00 mA
11.80 mA
12.10 mA
12.10 mA
12.10 mA
preset to
maximum brightness
(continuous)
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
4
DC Bias (Vdc)
On/Off Control
The inverter is ON if one of the following conditions are met:
• Pin 3 (On/Off) is connected to pin 1/2 (V
IN
)
• 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
© 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
FM 32227
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