tb62771ftg TOSHIBA Semiconductor CORPORATION, tb62771ftg Datasheet - Page 4

• Manufacturer Part Number: tb62771ftg
• Description: Step Up Type Dc/dc Controller Built In 4 Channel Sink Driver For White Led
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Pin Function
CONFIDENTIAL
QFN20
10
12
13
14
15
16
17
18
19
20
11
1
2
3
4
5
6
7
8
9
-
No
HTSSOP20
10
11
12
13
14
15
16
17
18
19
20
4
5
6
7
8
9
1
2
3
-
PGND2
PGND1
COMP
AGND
NDRV
Name
RSDT
OUT1
OUT2
OUT3
OUT4
SETI
OVP
DRV
VCC
FLT
DIM
VIN
EN
CS
EP
RT
I/O
O
O
O
O
O
O
O
O
O
O
O
P
P
P
P
I
I
I
I
I
-
Power supply input. The input voltage range is 4.75V to 40V.
Input chip enable signal,
EN=High: operation mode or standby mode,
EN=Low: shut down mode.
The Input logic threshold is 1.23V (typ) as internally.
Terminal for controlling compensation point of AMP which controls
output voltage. Connect RC between COMP and GND.
Internal Oscillator setting terminal.
Error signal output by fault protection control (Nch open drain) ,
This terminal is set Low when detecting LED Open, LED Short, and
thermal shut down. Connect a 10kΩ pull up resister from FLT to VCC.
Overvoltage threshold adjust input.
Connect Resistance from the switching converter output to OVP and
AGND. The OVP comparator reference is set 1.23V internally.
LED current adjust input. Connect a resister (RSETI) to AGND.ILED
are set by the formula ILED = 1.23/RSETI×1500
LED short detection adjusting input.
Connect Resistance from VCC to AGND. LED short detection
comparator in internally reference to 2V.Connect RSDT directly to
VCC to disable LED short detection.
Ground for logic signal. Connect to PGND1, PGND2.
Digital PWM dimming input.
DIM = High: Operation mode
DIM = Low: Standby mode.
Connect to VCC if dimming control is not used that like as constant
current sink.
Constant current sink terminals to drive LED for channel 1.
This terminal is open drain output which sinks up to 150mA.
Constant current sink terminals to drive LED for channel 2.
This terminal is open drain output which sinks up to 150mA.
Power Ground. Connect GND, PGND1.
Constant current sink terminals to drive LED for channel 3.
This terminal is open drain output which sinks up to 150mA.
Constant current sink terminals to drive LED for channel 4.
This terminal is open drain output which sinks up to 150mA.
Current sense input .To Monitor the current of external power
MOSFET source.
Power Ground. Connect AGND, PGND2.
Switching n-MOSFET gate driver output.
Power Supply input for the control circuits of switching MOSFET gate.
Connect Resistance between DRV and 5V regulator output VCC.
And connect DRV to PGND with minimum of 0.1μF Bypass capacitor.
5V Regulator Output.
Connect to GND with minimum of 1.0μF capacitor as close to the
device.
Exposed Pad. Connect to AGND.
Connect to AGND with resistance (RT). Switching Frequency are set
by the formula
4
RT = 7.350 x 10E9 / fsw
Function
TB62771FTG/FNG
2011-03-24