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부품번호 BD81A24EFV-M
기능 4ch White LED Driver
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BD81A24EFV-M 데이터시트, 핀배열, 회로
Datasheet
4ch White LED Driver with Buck-Boost
(40 LED Maximum)
BD81A24MUV-M / BD81A24EFV-M
General Description
BD81A24MUV-M/EFV-M is a white LED driver with the capability of
withstanding high input voltage (35V Max). This driver has 4ch
constant-current drivers integrated in 1-chip, where each channel
can draw up to 120mA (Max), which is also suitable for high
illumination LED drive. Furthermore, a buck-boost current mode
DC/DC controller is also integrated to achieve stable operation
during power voltage fluctuation. Light modulation (5000: 1 dimming
function) is possible by PWM input.
Key Specifications
Operating Input Voltage Range
4.5 to 35 V
Output LED Current Accuracy ±3.0%@50mA
DC/DC Oscillation Frequency 200 to 2200kHz
Operating Temperature Range -40 to +125°C
LED Maximum Output Current
120mA/ch
PWM Min Pulse Width
1.0µs
Features
Integrated Buck-Boost Current Mode DC/DC Controller
Integrated 4ch Current Driver for LED Drive
5000: 1 PWM Dimming @200Hz
External Switching Frequency Synchronization
Built-In Protection Function (UVLO, OVP, OCP, SCP)
LED Abnormality Detection Function (Open/Short)
Integrated VOUT Discharge Function (Buck-Boost or Buck
Structure Limitation)
AEC-Q100 Qualified (Note 1)
(Note 1) Grade1
Package(s) W(Typ) x D(Typ) x H(Max)
VQFN28SV5050
(BD81A24MUV-M)
HTSSOP-B28
(BD81A24EFV-M)
W(Typ) × D(Typ) × H(Max) W(Typ) × D(Typ) × H(Max)
5.0mm × 5.0mm ×1.0mm 9.7mm × 6.4mm × 1.0mm
Application
For Display audio, CID, Cluster, HUD
Small and Medium type LCD Panels for Automotive use.
Typical Application Circuit
VCC CIN
VCC
CREG
VREG
EN
VDISC
SYNC
RT
RRT
COMP
RPC
CPC
CSS
SS
BD81A24MUV-M /
BD81A24EFV-M
PWM
ISET
RISET
GND
OVP
CS
BOOT
OUTH
SW
OUTL
DGND
LED1
LED2
LED3
LED4
PGND
FAIL1
FAIL2
VREG
SHDETEN
LEDEN1
LEDEN2
Figure 1. Buck-Boost Application Circuit
Product structure: Silicon monolithic integrated circuit
This product has no designed protection against radioactive rays
COUT
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
1/36
TSZ02201-0T3T0C600070-1-2
2016.2.8 Rev.001




BD81A24EFV-M pdf, 반도체, 판매, 대치품
BD81A24MUV-M/EFV-M
Datasheet
<Caution of LED current setting>
If the output current ILED is set to >100mA/ch, the stability of LED current within specified operating temperature range will
decrease. LED current supply value will depends on the amount of ripple in output voltage (VOUT). The figure below shows
the temperature and the possible LED current maximum value settings, please adjust the ripple voltage in such a way that
the LED current value setting will fall within the range as shown on the graph below. (VOUT: Output Ripple Voltage) Please
refer P22, there is the detail information of VOUT ripple voltage.
(2) PWM Intensity Control
Ta vs ILED
120
110
100 VOUT=50mV
VOUT=100mV
90 VOUT=200mV
80
-40 -25 -10 5
20 35 50 65 80
Ta [ ]
95 110 125
Figure 5. Temperature (Ta) vs Output LED Current (ILED)
PWM
(2V/div)
500ns/div
PWM
(2V/div)
1ms/div
ILED
(50mA/div)
ILED
(50mA/div)
Figure 6. PWM=150Hz, Duty=0.02%, ILED Waveform
Figure 7. PWM=150Hz, Duty=50.0%, ILED Waveform
The current driver ON/OFF is controlled by PWM terminal. The duty ratio of PWM terminal becomes duty ratio of ILED. If don’t
use PWM dimming, please set the PWM terminal to HIGH. Output light intensity is greatest at 100% input
3. Buck-Boost DC/DC Controller
(1) Number of LED in Series Connection
In this IC, the output voltage of the DC/DC converter (VOUT) is controlled by LED cathode voltage (LED1–4 terminal
voltage) becomes 1.0V (Typ). When two or more LED are operating at the same time, the LED terminal voltage that
connects the highest LED Vf row is held at 1.0V (Typ). Then the voltages of other LED terminal will increased only LED VF
tolerance. Please decide LED VF tolerance by using the description as shown below:
LED series number x LED VF tolerance voltage < Short Detection Voltage 4.2V (Min) LED Control Voltage 1.1V (Max)
(2) Over Voltage Protection (OVP)
The output of the DC/DC converter (VOUT) should be connected to the OVP pin via voltage divider. If OVP terminal voltage
is over 2.0V (Typ), Over Voltage Protection (OVP) is active and stop the DCDC switching. In determining an appropriate
trigger voltage for OVP function, consider the total number of LEDs in series and the Maximum variation in VF. When OVP
terminal voltage drops to 1.94V (Typ) after OVP operation, the OVP will be released. If ROVP1 is GND side resistance,
ROVP2 is output voltage side resistance and output voltage is VOUT, OVP will occur at below equation.
[ ] {(
1[ ] +
2[ ])/
1[ ]} × 2.0[ ]
OVP will engage when VOUT >32V if ROVP1=22kand ROVP2=330k.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
4/36
TSZ02201-0T3T0C600070-1-2
2016.2.8 Rev.001

4페이지










BD81A24EFV-M 전자부품, 판매, 대치품
BD81A24MUV-M/EFV-M
Datasheet
(1) Under-Voltage Lock Out (UVLO)
The UVLO shuts down all the circuits except VREG when VCC<3.5V (Typ) or VREG <2.0V (Typ). And UVLO is
released by Vcc>4.0V (Typ) and VREG>3.5V (Typ).
(2) Thermal Shut Down (TSD)
The TSD shuts down all the circuits except VREG when the Tj reaches 175°C (Typ), and releases when the Tj becomes
below 150°C (Typ).
(3) Over-Voltage Protection (OVP)
The output voltage of DC/DC is detected from the OVP terminal voltage, and the over-voltage protection will activate if
the OVP terminal voltage becomes greater than 2.0V (Typ). When OVP is activated, the switching operation of the
DC/DC turns off. And OVP terminal becomes less than 1.94V (Typ), OVP is released and the switching operation of the
DC/DC turns on.
(4) Over-Current Protection (OCP)
The OCP detects the coil current by monitoring the voltage of the high-side resistor, and activates when the CS voltage
becomes less than VCC-0.2V (Typ).
When the OCP is activated, the switching operation of the DC/DC turns off. And CS voltage becomes over than
Vcc-0.2V (typ), OCP is released and the switching operation of the DC/DC turns on.
(5) Short Circuit Protection (SCP)
When the LED terminal voltage becomes less than 0.3V (Typ) or OVP terminal becomes less than 0.57V (typ), the
built-in counter operation will start and the latch will activate at oscillation frequency in 32770 count. In case of
fosc=300kHz, the count time is approximately 100ms. If the LED terminal voltage becomes over 0.3V or OVP terminal
becomes over 1.0V (typ) before 32770 count, the counter resets and SCP is not detected.
(6) LED Open Detection
When the LED terminal voltage is below 0.3V (Typ) and OVP terminal voltage more than 2.0V (Typ) simultaneously,
LED open is detected and latches off the open channel.
(7) LED Short Detection Circuit
If the LED terminal voltage becomes more than 4.5V (Typ), the built-in counter operation will start and the latch will
activate at oscillation frequency in 32770 count. In case of fosc=300kHz, the count time is approximately 100ms. During
PWM dimming, the LED Short Detect operation is carried out only when PWM=High. If the LED terminal voltage
becomes less than 4.5V (Typ) before 32770 count, the counter resets and LED Short is not detected.
When LED Short Detect function will not be used, SHDETEN terminal should be connected to VREG before starting.
When LED Short Detect function is used, the SHDETEN terminal should be connected to GND. In addition, it cannot
change SHDETEN voltage (High or Low) during normal operation.
(8) PWM Low Latch Off Circuit
After the EN is ON, the low interval of PWM input is counted by built-in counter. The clock frequency of counter is the
fosc Frequency, which is determined by RRT, and stops the operation of circuits except VREG at 32768 counts.
In case of fosc=300kHz, the count time is approximately 100ms.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
7/36
TSZ02201-0T3T0C600070-1-2
2016.2.8 Rev.001

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BD81A24EFV-M

4ch White LED Driver

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