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PDF TB62771FTG Data sheet ( Hoja de datos )
| Número de pieza | TB62771FTG | |
| Descripción | Step-up DC/DC controller built in 4-channel sink driver | |
| Fabricantes | Toshiba | |
| Logotipo |  |
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TOSHIBA BiCD Integrated Circuit Silicon Monolithic
TB62771FTG
Step-up DC/DC controller built in 4-channel sink driver for white LED
1. General description
TB62771FTG is a large-current LED driver IC incorporating
DC/DC controller for high-power LED systems.
This IC can drive high-intensity and large-current LED connected
to 4 constant current sinks.
This IC is for driving backlight of white LEDs for large LCD.
TB62771FTG
2. Features
• Input voltage range : 4.75 V to 40 V
Weight : 0.03 g (TYP.)
• Built in current mode DC/DC controller
• Switching frequency:
Set by the resistance connected to RT terminal (200 kHz to 2.0 MHz), Synchronization with external clock
• 4ch constant current driver:
Sink current 20 mA to 150 mA
Current accuracy +/- 2% (ILED = 100 mA, between channels)
Control voltage for minimum OUT terminal 0.5 V (ILED = 150 mA)
• Dimming control: Input PWM range 100 Hz to 30 kHz
Minimum pulse width of input PWM 330 ns
• Detection circuit:
VIN under voltage lockout (UVLO(VIN))
VCC under voltage lockout (UVLO(VCC))
LED open detection
LED short detection (Set by the resistance connected to RSDT terminal)
Built in thermal shutdown circuit
Overvoltage detection (set by external resistance)
• Soft start function
• Output delay function
• Shutdown consumption current 40 µA (max)
• IC package:P-WQFN20-0404-0.50-002
1 2013-05-23
1 page  
7. Equivalent circuits of terminals
Pin No. Pin name
1 VIN
9 AGND
13 PGND2
17 PGND1
20 VCC
VIN
VCC
AGND
PGND1
PGND2
2 EN
EN
Equivalent circuit
VIN
3 COMP
COMP
AGND
VCC
AGND
AGND
VCC
4 RT
RT
AGND
VCC
5 FLT FLT
AGND
VCC
6
OVP
OVP
AGND
5
TB62771FTG
2013-05-23
5 Page 
TB62771FTG
10. Operation mode
10.1 Mode change
Modes are selectable by 2 input signals.
EN input
･High
･Low
: Stand-by Mode1, Stand-by Mode2, Operation Mode
(Depend on DIM input condition. See the next page.)
: Shutdown Mode
DIM input
･High
･Low
: Operation Mode
: Stand-by Mode1, Stand-by Mode2
(See the next page.)
State of the IC is transferred to the operation mode by inputting high to EN terminal. DC/DC controller and constant
current regulators are controlled by inputting signal from DIM terminal.
This IC has variable abnormal detecting circuits and controls the operation depending on the abnormal state.
OFF mode
（VIN=0V,EN="L”,DIM＝”L”）
Apply VIN
Turn off VIN
Shutdown mode
（VIN apply,
EN="L”,DIM＝”L”）
EN=”H”
Startup Regulator
Startup UVLO(VIN)
Startup UVLO(VCC)
Startup ＴＳＤ
Stop Regulator
Stop UVLO(VIN)
Stop UVLO(VCC)
Stop ＴＳＤ
After UVLO (VCC) is
released
Startup Internal
OSC circuit
Startup at
DIM=”H”
OVP
Continuous monitoring
Startup at
DIM=”H”
OCP
OVP detection
OCP detection
Stop SW operation
NDRV:”L”
Open abnormal detection
Release at next
clock timing
Number of open error
channels
1 or more
0 OVP release
In case OCP detection is
continued at NDRV=”L” for
5clok or more
FLT=”L”
Stop operation of error OUT terminal
Error OUT terminal is not under controlled
FLT=”L”
Stop SW operation
Detect
unused OUT terminal
Startup Soft start
(FB control by OVP terminal）
Standby mode 1
EN=”L”
(FB control by OVP terminal）
DIM=”H”
（Less than 5clk）
DIM=”H”（5clk or more）
Stop internal OSC circuit
Reset abnormal detection
2 or less
Drive OUT
terminal
3
Phase shift
circuit OFF
Phase shift
circuit ON
Release OVP Release OVP
0
Abnormal detection mode
EN=”L”
Short detection
Current Regulator
operation
Reset Internal OSC
Standby mode ２
(FB control by OVP terminal）
EN=”L”
DIM=”H”（Less than 6clk） DIM=”H”（6clk or more）
Operation mode
（FB control by minimum
OUT terminal）
DIM=”L”
EN=”L”
Standby mode ３
(FB control by minimum OUT terminal）
EN=”L”
DIM=”H”
（Less than 5clk）
DIM=”H”（5clk or more）
Continuous monitoring
Startup at
EN=”H”
Startup at
EN=”H”
TSD VIN VCC
UVLO
UVLO
TSD detection
UVLO
deteciton
FLT=”L”
Stop SW operation
Stop SW operation
Stop Current
Regulator operation
Stop ＶＣＣ
Regulator operation
Falls TSD detection
temperature or less
Stop Current
Regulator operation
UVLO recovers to
recovery voltage or more
Release UVLO
Re-start from detecting
unused OUT terminal.
Release TSD
(Release FLT）
Re-start from detecting unused OUT terminal
11 2013-05-23
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet TB62771FTG.PDF ] | |
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