TB62754AFNG
TOSHIBA Bi-CMOS INTEGRATED CIRCUIT SILICON MOLITHIC
TB62754AFNG
Step Up Type DC/DC Controller built in 6 ch sink driver for White LED
TB62754AFNG is a high efficient step-up type DC/DC controller
specially designed for constant current drive of white LED.
This IC can drive white LEDs with constant current by dividing
white LEDs, which are serial connected with lots of LEDs, into 6
lines.
LED current (I
F
) is set with an external resistor and dimming
control is available by PWM signal.
This IC is especially for driving back light white LEDs in large LCD
which is 5 inches or more.
This IC is Pb-free product.
This IC is not in conformity with TS16949.
Weight :0.10g(TYP)
Characteristics
•
•
•
•
•
•
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Variable LED current (I
F
) is set with an external resistor.
48mA (Typ.) @RSET =5.1Ω
IC package:SSOP20-P-225-0.65B
Switching frequency:1.6 MHz (Typ.)
Constant current driver
:Built-in
open detect circuit.
Built-in thermal shutdown circuit:150℃(MIN)
Built-in output over voltage protect circuit:32V(MIN)
0
2007-1-30
TB62754AFNG
Pin Function
Pin No.
Symbol
Function Description
1
2
3
GD
VIN
SHDN
MOSFET control pin for DC/DC converter.
Supply input pin for IC drive. Operating voltage: 4.5 to 5.5V.
Input IC enable signal.
SHDN="H" : Normal mode.
SHDN="L”: Power saving mode. IC stops.
Input ON/OFF control signal of constant current output pin (FB1 to 6).
LED current (I
F
) can be controlled by inputting PWM signal.
SHDN pin
L
H
H
PWM pin
−
H
L
Voltage booster block
Stop
Feedback RSENS
voltage
Feedback OVP voltage
Constant current block
Stop
Drive
Stop
4
PWM
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
FB1
RSENS1
FB2
RSENS2
FB3
RSENS3
RSENS4
FB4
RSENS5
FB5
RSENS6
FB6
OVP
IS
SS
AGND
Constant current synchronization.
Constant current set resistor for sync driver (FB1).
Constant current synchronization.
Constant current set resistor for sync driver (FB2).
Constant current synchronization.
Constant current set resistor for sync driver (FB3).
Constant current set resistor for sync driver (FB4).
Constant current synchronization.
Constant current set resistor for sync driver (FB5).
Constant current synchronization.
Constant current set resistor for sync driver (FB6).
Constant current synchronization.
Over voltage detection. IC switching operation is disabled with detection over voltage. When
the voltage returns to detection level or less, operation is enabled again,
In case SHDN is input H and PWM is input L, output voltage is kept over 20V (typ) by
monitoring OVP voltage.
Monitoring MOSFET current.
When SHDN is input low to high, the constant number to limit the current is determined.
VOUT rising time changes depending on the constant number of Capacitor.
Ground pin for analog.
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2007-1-30