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PDF BD92111F Data sheet ( Hoja de datos )
| Número de pieza | BD92111F | |
| Descripción | White LED Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
PFC Direct current resonance type
White LED Driver for Large LCD
BD92111F
General Description
BD92111F 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 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
Key Specifications
Operating Power Supply Voltage Range:
8.0V to 18.0V
Minimum Oscillator Frequency:
65.8kHz
(RRT=22kΩ,RADJ=36kΩ,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
VCC
GND
PDIM
STB
PWM
GND
ERR
VCC
PDIM
ON/OFF
PWMIN
FAIL
< Primary Side >
PVIN
GND
T1
Figure. 1 SOP18
CSS CSDON
RADJ
CFBV S
CFBIS
RRT
RFBV S
RFBIS
CCP
RS
< Secondary Side >
Figure. 2 Typical Application Circuit(s)
〇Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
〇This product has no designed protection against radioactive rays
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TSZ02201-0F5F0C100090-1-2
31.Jan.2016 Rev.001
1 page  
BD92111F
Electrical Characteristics – continued (Unless otherwise specified Ta=25°C, VCC= 12V)
Parameter
Symbol
Limit
Min Typ
Min Unit
【Output Block】
N1 Output Sink Resistance
N1Output Source Resistance
N2 Output Sink Resistance
N2 Output Source Resistance
MAX DUTY
RN1SI
RN1SO
RN2SI
RN2SO
MAX DUTY
1.5
4.5
1.5
4.5
43.0
3.0 6.0 Ω
9.0 18.0 Ω
3.0 6.0 Ω
9.0 18.0 Ω
45.0 47.0 %
N1-N2,N2-N1Dead Time
Output Frequency
(minimum frequency setting)
tOFF
fOUTMIN
100 200 400 ns
59.3 65.8 72.3 kHz
【Timer Block】
Setting Voltage for CP Time
Setting Current for CP Time
VCP 1.90 2.00 2.10 V
ICP 0.85 1.00 1.15 µA
【COMP Block】
Over voltage Detection level of
COMP
VCOMP
3.88 4.00 4.12 V
Hysteresis width (COMP)
COMPSD Detection Voltage
⊿VCOMP
VCOMPSD
0.15
3.88
0.20 0.25 V
4.00 4.12 V
【FAIL Block】
FAIL Pin ON-Resistance
RFAIL
- 100 200 Ω
Conditions
fOUT=60kHz
RRT=22kΩ,RADJ=36kΩ,
VFB=3.2V
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
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TSZ02201-0F5F0C100090-1-2
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5 Page 
BD92111F
PIN.5 FB
This is output pin for LED current feedback (IS pin) error amplifier and open LED voltage feedback (VS pin) error
amplifier. The capacitance between FB and IS (1500pF to 0.01µF) also determines start up time of LED current
necessary during phase compensation and brightness adjustment. Capacitance between FB and VS (1500pF to
0.01µF) is for phase compensation of error amplifier.
BD92111F
OSC
Error Amp
Figure. 14 RRT and RADJ Resistor connection method
RT
RADJ
RRT
FB IS
CFBIS
CFBVS
VS
RFBIS
RFBVS
Figure. xx
As shown by left graph, by changing resistor RADJ
between FB and RT, it is possible to determine the
modulation width of frequency.
Modulation width of frequency determined by the
resistor between FB and RT resistor (Theoretical
formula : Example)
When RADJ=100kΩ , Δ fOUT=84.46kHz
.
Figure. 15 Modulation width of Output Frequency vs RADJ Resistance
Output Frequency vs FB Voltage
Modulation width of frequency determined by the
resistor between FB and RT resistor (Theoretical
formula : Example)
When RADJ=100kΩ , Δ fOUT=84.46kHz
FB voltage Vin [V]
Figure. 16 Output Frequency vs FB Voltage
The basic drive frequency is determined by resistor RRT which is connected from RT pin to GND. The basic
frequency is the one at VFB=1.5V, and operation frequency range will be fixed with frequency modulation width that
is determined by RADJ under this condition.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
11/24
TSZ02201-0F5F0C100090-1-2
31.Jan.2016 Rev.001
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet BD92111F.PDF ] | |
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