HT7963 Datasheet, PDF (1/11 Pages) Holtek Semiconductor Inc – LED Backlight Driver

HT7963
LED Backlight Driver
Features
• Integrated high power boost DC-DC controller
• Wide input voltage range from 9V to 30V
• High Voltage Gate-Drive provides lower RDS(ON)
and higher efficiencies
• Dimming frequency from 100Hz to 1kHz
• 0.3V LED feedback current sensing voltage with
±3% tolerance
• Device protection features include:
Soft-start, OCP, UVLO, OVP, OTP and output
short protection – OSP
• LED protection: LED Open/Short Protection
• Package type: 8-pin SOP
Applications
• LED Backlighting for LCD TV/Monitor
• LED lighting
General Description
The HT7963 is a high efficiency boost converter with
a fixed oscillator frequency for LED backlighting and
LED lighting application. The white LED current is
setup using an external current setting resistor, which
has a low feed-back voltage of only 0.3V. The DIM
input allows a wide range of dimming control for LED
backlighting or LED lighting. The device offers a full
range of protection functions such as power MOSFET
over current protection (OCP), IC power supply under
voltage lockout (UVLO), over-voltage protection
(OVP), output voltage short circuit protection (OSP)
and over temperature protection (OTP).
Typical Application Circuit
VIN = 12V~24V
CIN
220uF
L
47uH
51Ω
D1
VOUT
COUT
R1
47uF
PWM
RC
47KΩ
CC
33nF
1 VIN
8 DIM
6 COMP
3 GND
HT7963
DRV 2
CS ⁴
OVP 7
FB ⁵
10kΩ
RCS
10pF
100Ω
100Ω
optional
RFB
CFB
470pF
0.1uF
R2
optional
0.3V
ILED= _RFB
Note: The VOUT/VIN ratio is suggested to be lower than 5 to gain better dimming linearity.
Rev. 1.00
1
August 14, 2015