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Número de pieza BD9397EFV
Descripción 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=30kΩ)
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 structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has not designed protection against radioactive rays
1/27
TSZ02201-0F1F0C100330-1-2
9.Jan.2014 Rev.001
http://www.Datasheet4U.com

1 page




BD9397EFV pdf
BD9397EFV
●1.3 Pin Descriptions
No Pin name
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
21 PWM4
22 PWM5
23 PWM6
24 FAIL_RST
25 S6
26 S5
27 S4
28 S3
29 S2
30 S1
31 CP
32 SS
33 FB
34 RT
35 VREF
36 LED_LV
37 LSP
38 FAIL_MODE
39 UVLO
40 AGND
In/Out
Function
IN
OUT
OUT
-
OUT
IN
IN
IN
OUT
IN
OUT
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
OUT
OUT
OUT
OUT
IN
IN
IN
IN
IN
IN
Power source terminal
Abnormality detection output terminal (OPEN DRAIN)
9V regulator output terminal
Non connection terminal
DC/DC switching output terminal
Power GND terminal
DC/DC FET output current detection terminal
Overvoltage protection detection terminal
LED Diode OR output terminal
GND terminal for analog part
LED output 1
LED output 2
LED output 3
LED output 4
LED output 5
LED output 6
Standby control terminal
PWM dimming input signal terminal for LED 1
PWM dimming input signal terminal for LED 2
PWM dimming input signal terminal for LED 3
PWM dimming input signal terminal for LED 4
PWM dimming input signal terminal for LED 5
PWM dimming input signal terminal for LED 6
FAIL output reset terminal
Connecting terminal for LED 6 constant current setting resistor
Connecting terminal for LED 5 constant current setting resistor
Connecting terminal for LED 4 constant current setting resistor
Connecting terminal for LED 3 constant current setting resistor
Connecting terminal for LED 2 constant current setting resistor
Connecting terminal for LED 1 constant current setting resistor
Connecting terminal for non-reaction time setting capacitor
Connecting terminal for soft-start time setting capacitor
Error amplifier output terminal
Connecting terminal for DC/DC frequency setting resistor
Analog dimming DC voltage input terminal
LED control voltage set terminal
LED SHORT detection voltage setting terminal
FAIL function change terminal
Low voltage malfunction prevention detection terminal
GND terminal for analog part
Datasheet
rating
[V]
-0.3 to 36
-0.3 to 36
-0.3 to 13
-
-0.3 to 13
-
-0.3 to 7
-0.3 to 7
-0.3 to 13
-
-0.3 to 60
-0.3 to 60
-0.3 to 60
-0.3 to 60
-0.3 to 60
-0.3 to 60
-0.3 to 36
-0.3 to 22
-0.3 to 22
-0.3 to 22
-0.3 to 22
-0.3 to 22
-0.3 to 22
-0.3 to 22
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 10.5
-
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/27
TSZ02201-0F1F0C100330-1-2
9.Jan.2014 Rev.001
http://www.Datasheet4U.com

5 Page





BD9397EFV arduino
BD9397EFV
Datasheet
* For the adjustment of LED current with analog dimming by VREF, note that the output voltage of the DC/DC converter
largely changes accompanied by LED VF changes if the VREF voltage is changed rapidly. In particularly, when the VREF
voltages become high to low, it makes the LED terminal voltage seem higher transiently, which may influence application
such as activation of the LED short circuit protection. It needs to be adequately verified with an actual device when analog
dimming is used.
31pin. CP
Terminal which sets the time from detection of abnormality until shutdown (Timer latch). When the LED short protection,
LED open protection or SCP is detected, it perform s constant current charge of 1.0uA (typ.) to external capacitor. When the
CP terminal voltage reaches 2.0V (typ.), the IC is latched and FAIL terminal operates (at FAIL_MODE = L).
32pin. SS
Terminal which sets soft-start time of DC/DC converter: it performs constant current charge of 1.0uA to the external
capacitor connected with SS terminal, which enables soft-start of DC/DC converter.
Since the LED protection function (OPEN/SHORT detection) works when the SS terminal voltage reaches 3.0 V (typ.) or
higher, it must be set to bring stability to conditions such as DC/DC output voltage and LED constant current drive operation,
etc. before the voltage of 3.0 V is detected.
33pin. FB
Output terminal of the error amplifier of DC/DC converter which controls current mode:
The voltage of LED terminal which is the highest VF voltage among 6 LED strings and the voltage of LED_LV terminal
become input of the error amplifier. The DC/DC output voltage is kept constant to control the duty of the output N terminal
by adjusting the FB voltage.
The voltage of other LED terminals is, as a result, higher by the variation of Vf. Phase compensation setting is separately
described in ●3.7 How to set phase compensation.
A resistor and a capacitor need to be connected in series nearest to the terminal between FB and AGND.
The state in which all PWM signals are in LOW state brings high Impedance, keeping FB voltage. This action removes the
time of charge to the specified voltage, which results in speed-up in DC/DC conversion.
34pin. RT
RT sets charge/discharge current determining frequency inside IC.
Only a resistor connected to RT determines the drive frequency inside IC, the relationship has the following equation: FCT
is 500 kHz at RT= 30 kohm.
FCT vs RT(measurement data)
10000 
1000 
100 
10 
1
10 100
RT [kOhm]
Figure 16.
1000
1.2
1
0.8
0.6
0.4
0.2
0
0
Voltage between LEDx to Sx vs LED
Current (Tj=25, 85deg.)
85℃
25℃
50 100 150 200 250 300 350
LED Current Setting
Figure 17.
400
36pin. LED_LV
LED_LV terminal sets the reference voltage error amplifier. LED_LV terminal is assumed that it is set by dividing the
resistance with a high degree of accuracy, LED_LV terminal inside the IC is in open state (High Impedance). It is necessary
to input voltage to divide the resistance from the output of REG9V or use external power source. Using the terminal in open
state needs to be avoided.
According to output current, lowering LED_LV voltage can reduce the loss and heat generation inside IC. However, it is
necessary to ensure the voltage between drain and source of FET inside IC, so LED_LV voltage has restriction on the
following equation.
VLED_LV ≧ (LED-S terminal voltage) + 0.2×VREF [V]
For example, at ILED = 100mA setting by VREF = 1V, from figure the voltage between LED and S terminal is required 0.27
V at Tj = 85°C, so LED_LV voltage must be at least a minimum 0.47V.
Note: Rises in VLED_LV voltage and LED current accelerate heat generation of IC. Adequate consideration needs to be
taken to thermal design in use.
Note: LED_LV voltage is not allowed setting below 0.3V.
Note: LED current by raising LED_LV voltage can flow to MAX 400mA, use with care in the dissipation of the package.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/27
TSZ02201-0F1F0C100330-1-2
9.Jan.2014 Rev.001
http://www.Datasheet4U.com

11 Page







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