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Rohm Semiconductor Electronic Components Datasheet

BD9397EFV Datasheet

LED Drivers

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Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD
panel
BD9397EFV
General Description
BD9397EFV is a high efficiency driver for white LEDs
and designed for large LCD panel. This IC is built-in
high current drive and high responsibility type 6ch LED
drivers and 1ch boost DCDC converter. BD9397EFV
has some protect function against fault conditions,
such as the over-voltage protection (OVP), LED OPEN
and SHORT protection, the over current limit
protection of DCDC (OCP). Therefore BD9397EFV 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
Oscillator frequency:
500kHz (RT=30k)
Operating Current:
9mA (typ.)
Operating temperature range:
-40°C to +85°C
Applications
TV, Computer Display, Notebook, LCD Backlighting
Typical Application Circuit
Vin Cin
VCC
VCC
STB
CVCC
FAIL_MODE
FAIL_RST
RT
SS
REG9V UVLO
VREG
UVLO
(VCC)
UVLO TSD
OVP SCP
OSC
SS
PROTECTION
Logic
PWM
COMP
++
-
-
Control
Logic
Filter
REG9V
Current
Sense
DRIVER
REG9V
OVP
FAIL
CP
N
PGND
CS
FB
RFB
CFB LED_LV
REG9V
LSP
ERR
AMP ----
-
+
OPEN/SHORT
Detect
M_DET
LED1
+
-
S1
VREF
PWM1
1/5
+
-
PWM6
AGND
AGND
LED6
+
-
S6
N.C.
Figure 1. Typical Application Circuit
+Cout
Features
6ch Constant LED drivers, available 400mA drive
per 1ch.
Constant current accuracy ±1.8% (IC only)
Each 6ch external PWM inputs can control independent
dimming .
Current analog (linear) dimming by VREF
1ch boost controller with current mode (external FET)
Several protection functions
DCDC part : OCP/OVP/UVLO/TSD
LED driver part :OPEN,SHORT detection
SHORT detection voltage is set by LSP terminal.
Error detection output FAIL terminal inside
(normal=Open, error=Drain)
Package
HTSSOP-B40
Pin Pitch:
W(Typ.) D(Typ.) H(Max.)
13.60mm x 7.80mm x 1.00mm
0.65mm
Figure 2. HTSSOP-B40
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product has not designed protection against radioactive rays
1/27
TSZ02201-0F1F0C100330-1-2
9.Jan.2014 Rev.001
http://www.Datasheet4U.com


Rohm Semiconductor Electronic Components Datasheet

BD9397EFV Datasheet

LED Drivers

No Preview Available !

BD9397EFV
Datasheet
Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
Ratings
Unit
Operating Temperature Range
Ta(opr)
-40 to +85
°C
Storage Temperature Range
Tstg
-55 to +150
°C
Power Dissipation
Thermal resistance between junction and case
Pd
θjc
4.7 *1
7 *2
W
°C/W
Maximum Junction Temperature
Tjmax
150 °C
Maximum LED output current
ILED
400 *3 *4
mA
*1 In the case of mounting 4 layer glass epoxy base-plate of 70mm×70mm×1.6mm, 37.6mW is reduced at 1°C above Ta=25.
*2 In the case of mounting 4 layer glass epoxy base-plate of 70mm×70mm×1.6mm.
*3 Wide VF variation of LED increases loss at the driver, which results in rise in package temperature. Therefore, the board needs to be designed
with attention paid to heat radiation.
*4 This current value is per 1ch. It needs be used within a range not exceeding Pd.
Operating Ratings (Ta = 25°C)
Parameter
Symbol
Range
Unit
Power supply voltage
VCC
9 to 35
V
DC/DC oscillation frequency
FCT
100 to 1250 *5
kHz
VREF input voltage
VREF
0.2 to 2.5
V
LSP terminal input voltage
VLSP
0.8 to 3
V
FB terminal output voltage
VFB
0 to 3.3
V
M_DET terminal output voltage
VM_DET
0 to REG9V
V
The operating conditions written above are constants of the IC unit. Be careful enough when setting the constant in the actual set.
External Components Recommended Range
Item
VCC terminal connection capacitance
Soft-start set capacitance
Timer latch set capacitance
Operating frequency set resistance
REG9V terminal connection capacitance
The values described above are constants for a single IC.
Symbol
Setting Range
Unit
CVCC
1.0 to 10
μF
SS
0.001 to 1.0
μF
CP
0.001 to 2.7
μF
RT
12 to 150
k
CREG9V
2.2 to 10
μF
Adequate attention must be paid to setting of a constant for an actual set of parts
Pin Configuration
Physical Dimension Tape and Marking Diagram
1 VCC
2 FAIL
3 REG9V
4 N.C.
5N
6 PGND
7 CS
8 OVP
9 M_DET
10 AGND
11 LED1
12 LED2
13 LED3
14 LED4
15 LED5
16 LED6
17 STB
18 PWM1
19 PWM2
20 PWM3
AGND 40
UVLO 39
FAIL_MODE 38
LPS 37
LED_LV 36
VREF 35
RT 34
FB 33
SS 32
CP 31
S1 30
S2 29
S3 28
S4 27
S5 26
S6 25
FAIL_RST 24
PWM6 23
PWM5 22
PWM4 21
Figure 3.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
BD9397EFV
Figure 4-1. SOP-24
LOT No.
Figure 4. HTSSOP-B40
2/27
TSZ02201-0F1F0C100330-1-2
9.Jan.2014 Rev.001
http://www.Datasheet4U.com


Part Number BD9397EFV
Description LED Drivers
Maker ROHM
Total Page 30 Pages
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