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Rohm Semiconductor Electronic Components Datasheet

BD94121F Datasheet

White LED Driver

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Datasheet
PFC Direct current resonance type
White LED Driver for Large LCD
BD94121F
General Description
BD94121F is a current resonance type LED Driver with
frequency-controlled LED current. It can connect to PFC
directly and can use half-bridge structure reducing the
number of external components.
It incorporates some protection functions against fault
conditions such as Over-Voltage Protection, LED Short
Detection (IS High Detection) and LED Open Detection
(IS Low Detection).
Features
20V High Rating Process
1 Channel Push-pull Control
Current and Voltage Feedback by Driving
Frequency
Adjustable Soft Start
Adjustable Timer Latch
Under-Voltage Detection for IC’s Power Line
Output Over-Voltage Protection
Output Error Signal from FAIL Terminal
Shift to Save Mode by STB Terminal
Burst Control by External PWM Signal
Analog Dimming by External DC Signal
Conversion Function from Pulse to DC
Key Specifications
Operating Power Supply Voltage Range:
9.0V to 18.0V
Minimum Oscillator Frequency:
67kHz
(RRT=27kΩ,RADJ=44kΩ,VFB=3.2V)
Operating Current:
2.3mA (Typ)
Operating Temperature Range: -40°C to +85°C
Package
SOP18
W(Typ) x D(Typ) x H(Max)
11.20mm x 7.80mm x 2.01mm
Pin pitch 1.27mm
Applications
TV, Computer Display, LCD Backlighting.
Typical Application Circuit
Figure. 1 SOP18
VCC
GND
PDIM
STB
PWM
GND
ERR
VCC
PDIM
ON/OFF
PWMIN
FAIL
< Primary Side >
PVIN
GND
T1
PDIM
CSS CSDON
RADJ
CFBV S
CFBIS
RRT
RFBV S
RFBIS
CCP
RS
< Secondary Side >
Figure. 2 Typical Application Circuit(s)
Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
This product has no designed protection against radioactive rays
1/24
TSZ02201-0F5F0C100100-1-2
22.Feb.2016 Rev.001


Rohm Semiconductor Electronic Components Datasheet

BD94121F Datasheet

White LED Driver

No Preview Available !

BD9412F
Contents
General Description....................................................................................................................................................1
Features .......................................................................................................................................................................1
Applications ................................................................................................................................................................1
Key Specifications ......................................................................................................................................................1
Package .......................................................................................................................................................................1
Typical Application Circuit.........................................................................................................................................1
Absolute Maximum Ratings.......................................................................................................................................3
Recommended Operating Conditions ......................................................................................................................3
External Components Recommended Range..........................................................................................................3
Pin Configuration........................................................................................................................................................3
Physical Dimension and Marking Diagram ..............................................................................................................3
Electrical Characteristics...........................................................................................................................................4
Pin Description............................................................................................................................................................6
I/O Equivalent Circuits................................................................................................................................................7
Block Diagram.............................................................................................................................................................8
Typical Performance Curves .....................................................................................................................................9
Pin Function Description .........................................................................................................................................10
Detection Condition List of the Protection Functions ..........................................................................................15
Behavior List of the Protect Function ....................................................................................................................15
Application Example ................................................................................................................................................16
Timing Chart..............................................................................................................................................................17
Operational Notes .....................................................................................................................................................20
Ordering Information ................................................................................................................................................22
Marking Diagrams.....................................................................................................................................................22
Physical Dimension, Tape and Reel Information...................................................................................................23
Revision History .......................................................................................................................................................24
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
2/24
TSZ02201-0F5F0C100100-1-2
22.Feb.2016 Rev.001


Part Number BD94121F
Description White LED Driver
Maker ROHM
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