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PDF BD94121F Data sheet ( Hoja de datos )
| Número de pieza | BD94121F | |
| Descripción | White LED Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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)
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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TSZ02201-0F5F0C100100-1-2
22.Feb.2016 Rev.001
1 page  
BD9412F
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
60.3 67.0 73.7 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
【ADIM Block】
ADIM Pin Inflow Current 1
IADIM1 -5 0 +5 µA
ADIM Pin Inflow Current 2
PWM2DC Pin Inflow Current
PWM2DC Pin High Voltage
PWM2DC Pin Low Voltage
PWM2DC Pin Selected Voltage to
High Impedance
【COMPSD Block】
COMPSD Detection Voltage
【FAIL Block】
FAIL Pin ON-Resistance
IADIM2
IPWM2DC
VPWM2DCH
VPWM2DCL
VPWM2DCZ
VCOMPSD
RFAIL
19
4
1.8
-0.3
7.5
3.88
-
28 37 µA
6 8 µA
- 5.0 V
- +0.8 V
8.0 8.5 V
4.00 4.12 V
100 200 Ω
Conditions
fOUT=60kHz
RRT=27kΩ,RADJ=44kΩ,
VFB=3.2V
VADIM=2.2V,
VPWM2DC=12V
VADIM=5V,
VPWM2DC=12V
VPWM2DC=3V
PWM2DC=sweep up
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
5/24
TSZ02201-0F5F0C100100-1-2
22.Feb.2016 Rev.001
5 Page 
BD9412F
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.
BD94121F
OSC
Error Amp
Figure. 14 RRT and RADJ Resistor connection method
RT
RADJ
RRT
FB IS
CFBIS
CFBVS
VS
RFBIS
RFBVS
Moduration width of Output Frequency
150
125
108.1
100
75
50
25 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=108.1kHz
0
10 100 1000
Figure. 13 出力周波数R変AD動J Re幅sistan対ce : RRADAJ D[kJΩ]抵抗値 特性
Figure. 15 Modulation width of Output Frequency vs RADJ Resistance
Output Frequency vs FB Voltage
200
180 167.8
160
140
120
100
80
60
59.7
40
20 0.5
0
0
3.2
12345
FB Voltage : VFB [V]
Figure. 16 Output Frequency vs FB Voltage
6
Modulation width of frequency determined by the
resistor between FB and RT resistor (Theoretical
formula : Example)
When RADJ=100kΩ , Δ fOUT=108.1kHz
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. When RRT=51kΩ, fOUT=127.7kHz becomes to basic drive frequency.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
11/24
TSZ02201-0F5F0C100100-1-2
22.Feb.2016 Rev.001
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet BD94121F.PDF ] | |
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