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PDF ( 数据手册 , 数据表 ) BD9394FP

零件编号 BD9394FP
描述 LED Drivers
制造商 ROHM Semiconductor
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BD9394FP 数据手册, 描述, 功能
Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD
Panels (DCDC Converter type)
BD9394FP, BD9394EFV
General Description
BD9394FP, BD9394EFV is a high efficiency driver for
white LEDs and designed for large LCDs. This IC is
built-in a boost DCDC converters that employ an array of
LEDs as the light source. BD9394FP, BD9394EFV has
some protect function against fault conditions, such as
the over-voltage protection (OVP), the over current limit
protection of DCDC (OCP), the short circuit protection
(SCP), the open detection of LED string. Therefore
BD9394FP, BD9394EFV is available for the fail-safe
design over a wide range output voltage.
Key Specification
„ Operating power supply voltage range: 9.0V to 35.0V
„ LED minimum current
30mA
„ LED maximum current:
150mA
„ Oscillator frequency:
150kHz (RT=100kΩ)
„ Operating Current:
4.5mA (Typ.)
Operating temperature range:
-40to +85
Applications
TV, Computer Display, Notebook, LCD Backlighting
Features
„ 4ch LED constant current driver and DC/DC converter
„ Maximum LED Current: 150mA
„ LED Feedback Voltage: 0.37V (@NADIM=2.62V),
so lower heat. Adjustable Feed Back Voltage
by following LED Current setting.
„ ±2% LED current accuracy (NADIM=2.62V,
when each LED is set to 100mA)
„ Analog current (Linear) dimming at NADIM pin
„ LED pin rating 60V
„ Individual detection and individual LED OFF for both
open and short circuits
„ Built-in ISET pin short-circuit protection circuit
„ Set Soft-Start time by external capacitor.
„ FET’s Gate (N pin) is driven by 5.8V swing
„ Built-in Vout discharge circuit for shutdown
„ Built-in Vout overvoltage protection (OVP) /
reduced voltage protection (SCP) circuit
„ Adjustable LED Short Protection Voltage
by LSP terminal
„ HSOP20, HTSSOP-B24 package with high heat
radiation efficiency
Package
HSOP20
HTSSOP-B24
W(Typ.) x D(Typ.) x H(Max.)
14.90mm x 7.80mm x 2.10mm
7.80mm x 7.60mm x 1.00mm
Typical Application Circuit (4 light with PWM)
VIN
VIN
Inductor
Diode
Fig.1(a) HSOP20
CIN
FET
PGND
AGND
REG58
COUT
REG58
CREG
RN2
RCS DN RN1
RRT
ROVP1
ROVP2
COVP
RFB CFB1
RLSP1
RLSP2
CFB2
CLSP
CSS
RISET
CAUTO
NADIM
FIN1, 2
REG58
N
DCDC_GND
CS
RT
OVP
FB
LSP
SS
ISET
AUTO
NADIM
STB
VCC
LED4
LED3
LED_GND
LED2
LED1
PWM
AGND
ON/OFF
RVCC
CVCC
CLED4
CLED3
CLED2
CLED1
PWM
Fig.1(b) HTSSOP-B24
Fig.2 Typical Application Circuit
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product is not designed protection against radioactive rays
1/28
TSZ02201-0F1F0C100180-1-2
09.Nov.2012 Rev.002
http://www.Datasheet4U.com







BD9394FP pdf, 数据表
BD9394FP, BD9394EFV
Typical Performance Curve
10
9
8
7
6
5
4
3
9
14 19 24 29 34
VCC[V]
Fig.7 Operating Current (ICC) [mA] vs. VCC[V]
Datasheet
1000
100
10
10
100
RRT[kohm]
1000
Fig.8 N Frequency [MHz] vs. R_RT [MΩ]
110
108
106
104
102
100
98
96
94
92
90
-40 -20 0 20 40 60 80
Temp[]
Fig.9 LED Current (ILED) [mA] vs. Temp []
140
120
100
80
60
40
VCC=24V
ISET=75kΩ
20
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
NADIM[V]
Fig.10 LED Current (ILED) [mA] vs. NADIM [V]
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
8/28
TSZ02201-0F1F0C100180-1-2
09.Nov.2012 Rev.002
http://www.Datasheet4U.com







BD9394FP equivalent, schematic
BD9394FP, BD9394EFV
Datasheet
OVP/SCP Settings
OVP pin is DC/DC output voltage’s over voltage protection and short circuit protection input pin.
OVP pin is a high impedance pin with no pull down resistor. Thus, at OPEN state please set the voltage
input settings using voltage dividing resistor and such.
Respective OVP pin protection conditions are as below
Protection
Name
Detection
Pin
Detection Cancellation
Timer
Condition
Condition Operations
Protection Type
OVP
SCP
OVP
OVP
OVP>3.0V
OVP<0.1V
OVP<2.9V
OVP>0.1V
No DCDC stops during detection
Yes All latch
OVP Detection Setting
VOUT abnormally increasevoltage detected by OVP, VOVPDET,
R1,R2 settings are as follows
R1 = R2[k]× (VOVPDET[V ] 3.0[V ]) [k]
3.0[V ]
OVP Cancellation Setting
R1,R2 set from above equation,
OVP cancellation voltage VOVPCAN equals to
VOVPCAN
=
2.9V
×
(R1[k] + R2[k])
R2[k]
[V ]
SCP Detection Setting
When R1,R2 are set using values obtained above, SCP voltage setting is VSCPDET is as follows
VSCPDET
=
0.1V
×
(R1[k] + R2[k])
R2[k]
[V ]
Setting Example
VOUT at normal operation 56VOVP detection voltage VOVPDET=68VR2=10k, R1 is as follows
R1 = R2[k]× (VOVPDET [V ] 3.0[V ]) =10[k]× (68[V ] 3[V ]) = 216.7 [k]
3.0[V ]
3[V ]
When R1, R2 are set at these values, OVP cancellation voltage, VOVPCAN
VOVPCAN
= 2.9[V ]× (R1[k] + R2[k])
R2[k]
= 2.9[V ]×10[k] + 216.7[k] [V ] = 65.7
10[k]
[V ]
In addition, at this R1, R2, SCP detection voltage
VSCPDET
= 0.1[V ] ×
(R1[k] + R2[k])
R2[k]
= 0.1[V ] × 10[k] + 216.7[k][V ] = 2.27
10[k]
[V ]
To select DC/DC components, give consideration to IC variations as well as individual component variations,
and then conduct thorough verification on practical systems.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
16/28
TSZ02201-0F1F0C100180-1-2
09.Nov.2012 Rev.002
http://www.Datasheet4U.com










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