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BD8113EFV PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD8113EFV
기능 White Backlight LED Driver
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BD8113EFV 데이터시트, 핀배열, 회로
LED Drivers for LCD Backlights
White Backlight LED Driver
for Medium to Large LCD Panels
(Switching Regulator Type)
BD8113EFV
No.11040EAT04
Description
BD8113EFV is a white LED driver with the capability of withstanding high input voltage (36V MAX). This driver has 2ch
constant-current drivers integrated in 1-chip, which each channel can draw up to 150mA max, so that high brightness LED
driving can be realized. Furthermore, a current-mode buck-boost DC/DC controller is also integrated to achieve stable
operation against voltage input and also to remove the constraint of the number of LEDs in series connection.
The brightness can be controlled by either PWM or VDAC techniques.
Features
1) Input voltage range 5.0 – 30 V
2) Integrated buck-boost current-mode DC/DC controller
3) Two integrated LED current driver channels (150 mA max. each channel)
4) PWM Light Modulation(Minimum Pulse Width 25µs)
5) Oscillation frequency accuracy ±5%
6) Built-in protection functions (UVLO, OVP, TSD, OCP, SCP)
7) LED abnormal status detection function (OPEN/ SHORT)
8) HTSSOP-B24 package
Applications
Backlight for display audio, small type panels, etc.
Absolute maximum ratings (Ta=25)
Parameter
Symbol
Ratings
Power supply voltage
VCC
36
BOOT ,OUTH Voltage
VBOOT, VOUTH
41
SW,CS Voltage
VSW, VCS
36
BOOT-SW Voltage
VBOOT-SW
7
LED output voltage
VREG, OVP, OUTL, FAIL1, FAIL2, LEDEN,
ISET, VDAC, PWM, SS, COMP, RT,
SYNC, EN voltage
Power Consumption
VLED1,2
VVREG, VOVP, VOUTL, VFAIL1, VFAIL2,
VLEDEN, VISET, VVDAC, VPWM, VSS,
VCOMP, VRT, VSYNC, VEN
Pd
36
-0.37 < VCC
1.10 1
Operating temperature range
Topr -40+105
Storage temperature range
LED maximum output current
Tstg
ILED
-55+150
150 2 3
Junction temperature
Tjmax
150
*1 IC mounted on glass epoxy board measuring 70mm×70mm×1.6mm, power dissipated at a rate of 8.8mw/at temperatures above 25.
*2 Dispersion figures for LED maximum output current and VF are correlated. Please refer to data on separate sheet.
*3 Amount of current per channel.
Unit
V
V
V
V
V
V
W
mA
Operating conditions (Ta=25)
Parameter
Symbol
Ratings
Power supply voltage
VCC 5.030
Oscillating frequency range
External synchronization frequency range 4 5
FOSC
FSYNC
250600
fosc600
External synchronization pulse duty range
FSDUTY
4060
*4 Connect SYNC to GND or OPEN when not using external frequency synchronization.
*5 Do not switch between internal and external synchronization when an external synchronization signal is input to the device.
Unit
V
kHz
kHz
%
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/19
2011.07 - Rev.A




BD8113EFV pdf, 반도체, 판매, 대치품
BD8113EFV
Block diagram and pin configuration
Technical Note
Vin
CIN
VCC
EN
SYNC
CRT RT
RT
COMP
Ccomp
RPC
CPC
SS
CSS
PWM
VREG
UVLO TSD
VREG
PWM
OVP
Timer
Latch
Control Logic
OSC
SLOPE
PWM
OCP
DRV
CTL
OCP OVP
SS
ERR AMP
Current driver
VREG
OVP
CS
FAIL1
BOOT
OUTH
SW
DGND
OUTL
GND
LED1
LED2
VDAC
ISET
RISET
ISET
Open Short Detect
Timer
Latch
Open Det
Short Det
PGND
FAIL2
LEDEN
Fig.13
COUT
Pin layout
BD8113EFV(HTSSOP-B24
COMP
SS
VCC
EN
RT
SYNC
GND
PWM
FAIL1
FAIL2
LEDEN
LED1
1
2
3
4
5
6
7
8
9
10
11
12
Fig.14
Pin function table
Pin
1
2
3
24 VREG
4
5
23 BOOT
6
22 CS
21 OUTH
20 SW
7
8
9
10
19 DGND 11
18 OUTL
12
13
17 PGND 14
16 ISET 15
15 VDAC 16
14 OVP
13 LED2
17
18
19
20
21
22
23
24
Symbol
COMP
SS
VCC
EN
RT
SYNC
GND
PWM
FAIL1
FAIL2
LEDEN
LED1
LED2
OVP
VDAC
ISET
PGND
OUTL
DGND
SW
OUTH
CS
BOOT
VREG
Function
Error amplifier output
Soft start time-setting capacitance input
Input power supply
Enable input
Oscillation frequency-setting resistance input
External synchronization signal input
Small-signal GND
PWM light modulation input
Failure signal output
LED open/short detection signal output
LED output enable pin
LED output 1
LED output 2
Over-voltage detection input
DC variable light modulation input
LED output current-setting resistance input
LED output GND
Low-side external MOSFET Gate Drive out put
Low-side internal MOSFET Source out put
High-side external MOSFET Source pin
High-side external MOSFET Gate Drive out pin
DC/DC Current Sense Pin
High-side MOSFET Power Supply pin
Internal reference voltage output
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
4/19
2011.07 - Rev.A

4페이지










BD8113EFV 전자부품, 판매, 대치품
BD8113EFV
Technical Note
Self-diagnostic functions
The operating status of the built-in protection circuitry is propagated to FAIL1 and FAIL2 pins (open-drain outputs). FAIL1
becomes low when UVLO, TSD, OVP, or SCP protection is engaged, whereas FAIL2 becomes low when open or short
LED is detected.
FAIL1
FAIL2
UVLO
TSD
OVP
OCP
OPEN
SHORT
MASK
S
Q
R
SCP
Counter
S
Q
EN=Low
R
UVLO/TSD
EN=Low
UVLO/TSD
Operation of the Protection Circuitry
Under-Voltage Lock Out (UVLO)
The UVLO shuts down all the circuits other than REG when VREG 4.0V (TYP).
Thermal Shut Down (TSD)
The TSD shuts down all the circuits other than REG when the Tj reaches 175(TYP), and releases when the Tj
becomes below 150(TYP).
Over Current Protection (OCP)
The OCP detects the current through the power-FET by monitoring the voltage of the high-side resistor, and activates
when the CS voltage becomes less than VCC-0.6V (TYP).
When the OCP is activated, the external capacitor of the SS pin becomes discharged and the switching operation of
the DCDC turns off.
Over Voltage Protection (OVP)
The output voltage of the DCDC is detected with the OVP-pin voltage, and the protection activates when the OVP-pin
voltage becomes greater than 2.0V (TYP).
When the OVP is activated, the external capacitor of the SS pin becomes discharged and the switching operation of
the DCDC turns off.
Short Circuit Protection (SCP)
When the LED-pin voltage becomes less than 0.3V (TYP), the internal counter starts operating and latches off the circuit
approximately after 100ms (when FOSC = 300kHz). If the LED-pin voltage becomes over 0.3V before 100ms, then the
counter resets.
When the LED anode (i.e. DCDC output voltage) is shorted to ground, then the LED current becomes off and the LED-pin
voltage becomes low. Furthermore, the LED current also becomes off when the LED cathode is shorted to ground. Hence
in summary, the SCP works with both cases of the LED anode and the cathode being shorted.
LED Open Detection
When the LED-pin voltage 0.3V (TYP) as well as OVP-pin voltage 1.7V (TYP) simultaneously, the device detects as
LED open and latches off that particular channel.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
7/19
2011.07 - Rev.A

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BD8113EFV

White Backlight LED Driver

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