TAIYO YUDEN
RoHS
LS460-RH
Model
LCD Backlight Driver
COMPLIANT
12 Volt Input
Dual Tube CCFT Inverter
Brightness Control
Physical Specifications*
Dimensions:
Weight:
Operating Temp:
Relative Humidity:
Storage:
Impact Resistance:
Vibration Resistance:
20mm x 120mm x 9.5mm
(0.787" x 4.72" x 0.374")
20g (0.704 oz)
0 to 55°C, convection cooling
20% to 90%, non-condensing
-20 to 85°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
Input Current
—
Continuous Operation
Starting Condition (Discharge Starting Voltage)
V
IN
= 10.8 Vdc
Luminance @ Max.
Control Terminal
H = V
IN
V
IN
= 13.2 Vdc
V
IN
= 13.2 Vdc
Luminance @ Max.
V
IN
= 12 Vdc
Luminance @ Max.
Control Terminal
L = 0.0 - 0.4 Vdc
V
IN
= 13.2 Vdc
Control Terminal
H = Open
12 Vdc
10.8 Vdc - 13.2 Vdc
10.8 Vdc - 13.2 Vdc
0.65A
3.0 µA
(Lamp Off)
3.0 Azero-p/0.3 ms
7.0W
I
LOW
= -0.4mA over
(Lamp Lighting)
—
(Lamp Off)
Max. Rush Current
Max. Input Power
Control Terminal
Input Current
*Above specifications occur @ 25 ± 5ºC.
Output Specifications*
Item
Condition
Standard
MIN
TYP
MAX
Output Voltage (Vrms)
Tube Current (mArms)
Max. Power Output (W)
Ignition Frequency (kHz)
DC/DC Converter Frequency (kHz)
V
IN
= 12.0 Vdc
Vcont = 0.0 V
Vcont = 2.5 V
V
IN
= 12 Vdc/Luminance @ Max.
Luminance @ Max.
Luminance @ Max.
—
4.2
—
—
—
—
1300
4.7
2.4
—
47
90
—
5.2
—
5.5
—
—
*Above specifications occur @ 25 ± 5ºC & V
IN
= 10.8 - 13.2 Vdc.
Model
LS460-RH
Insulating Withstand Voltage
Item
Rating Description
Insulating Withstand Voltage
Insulating Resistance
Primary - Secondary
Primary - Secondary
Winding - Core
1.5 KVa Impulse
500 Vdc
More than 100MΩ
© 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
Model
LS460-RH
Tech Notes
Connection Diagram
LS460-RH
CN1
Molex 53261-0771
CN2, CN3
JST SM02(8.0)B-BHS-1-TB(LF)
Output Current Optimization Method
Maximum output current can be adjusted by applying bias
voltage between brightness control pins as shown below.
Input (C1)
1
2
3
4
5
6
7
V(in)
V(in)
Gnd
Gnd
On/Off
Brightness
SG
DC
Bias
Typical
Output Current
Maximum
Output Current
Brightness
Control DC Bias
(Vdc)
0.00
0.80
1.20
1.60
2.00
2.40
V
V
V
V
V
V
4.8
4.5
4.0
3.5
3.0
2.5
mA
mA
mA
mA
mA
mA
5.2
5.0
4.5
4.0
3.5
3.0
mA
mA
mA
mA
mA
mA
On/Off Control
The on/off control is achieved by using the on/off pin on the input
side of LS460. The circuit for the remote on/off circuitry consists
of an active low TTL switch. When the circuit is open, the V(in)
is cut off. When the circuit is closed, V(in) is activated. A mechani-
cal switch or a TTL/CMOS gate needs to be placed between the
remote on/off pin and ground creating a condition where the cir-
cuit is closed to activate the inverter. Either one of the following will
be required for the inverter to operate:
One recommended use of logic switch for remote on/off is shown
in the diagram below. Electrical specification for on/off terminal is
Low 0 to 0.4V, -0.4 mA or higher when switch is closed.
V(in)
V(in)
On/Off Pin
On/Off Pin
0V Inverter Off
5V Inverter On
SW (External)
To IC Vcc
To IC Vcc
1. Tie on/off pin to ground.
2. Add mechanical switch between on/off pin and ground, close switch.
3. Add TTL/CMOS switch between on/off and ground. Circuit must be closed for
unit to operate (as shown above right).
Model
LS460-RH
Tech Notes
Brightness Control Using a Potentiometer
The LS460 brightness control is done by applying a DC bias of 0
to 2.5V to the brightness control pins. Unlike the single tube invert-
ers like the LS380s, brightness control for dual tube inverters can-
not be accomplished with a potentiometer. The reason for this is
that the LS460 has a voltage follower, or a sub-regulator built into
the unit to synchronize both outputs. This voltage follower compen-
sates for resistive load to the brightness control circuitry.
However, by using a voltage separator circuit consisting of a poten-
tiometer, a virtual brightness control by potentiometer can be
achieved.
Note that current which will run between the brightness
control pin will be in a trivial 3.0µA range.
Mean Time Between Failures (MTBF)
By using the MIL-HDBK 217E Condition Ground Benign
method, the MTBF for the LS460 is calculated at 787,407
hours.
© 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
创意市集
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
