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PDF BD81A44EFV-M Data sheet ( Hoja de datos )

Número de pieza BD81A44EFV-M
Descripción 4ch White LED Driver
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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Datasheet
4ch White LED Driver with Buck-Boost
(40 LED Maximum)
BD81A44MUV-M / BD81A44EFV-M
General Description
BD81A44MUV-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
LED Maximum Output Current
120mA/ch
PWM min pulse width
1.0us
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
(BD81A44MUV-M)
HTSSOP-B28
(BD81A44EFV-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
BD81A44MUV-M /
BD81A44EFV-M
PWM
ISET
RISET
GND
OVP
CS
BOOT
OUTH
SW
OUTL
DGND
LED1
LED2
LED3
LED4
PGND
FAIL1
FAIL2
SHDETEN
LEDEN1
LEDEN2
Figure 1. Buck-Boost Application Circuit
Product structureSilicon monolithic integrated circuit
This product has no designed protection against radioactive rays
COUT
VREG
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
1/35
TSZ02201-0T3T0C600060-1-2
2016.10.19 Rev.003

1 page




BD81A44EFV-M pdf
BD81A44MUV-M/EFV-M
(3) Buck-Boost DC/DC Converter Oscillation Frequency (FOSC)
2000
RRT vs FOSC
Datasheet
200
1
10
RRT [kohm]
100
Figure 8. RRT vs FOSC
DCDC oscillation frequency can be set via a resistor connected to the RT pin. This resistor determines the charge/discharge
current to the internal capacitor, thereby changing the oscillation frequency. Please set the resistance of RRT using the above
data and below equation.
[ ] = (81 × 10 ⁄ [ Ω]) ×
Where:
81×102 is the constant value in IC (+/-10%)
α is the adjustment factor
(RRT : α = 41k: 1.01, 27k: 1.00, 18k: 0.99, 10 k: 0.98, 4.7k: 0.97, 3.9k: 0.96)
A resistor in the range of 3.6 kto 41 kis recommended. Settings that deviate from the frequency range shown above may
cause switching to stop, and proper operation cannot be guaranteed.
(4) External Synchronization Oscillation Frequency (FSYNC)
If the clock signal input to SYNC terminal, the internal oscillation frequency can be synchronized externally.
Do not switch from external to internal oscillation if the DC/DC converter is active.
The clock input to SYNC terminal is valid only in rising edge.
As for the external input frequency, the input of the internal oscillation frequency ± 20% decided in RT terminal resistance
is recommended.
(5) Soft Start Function (SS)
The soft-start (SS) function can limits the start up current and output rise-time slowly if the capacitor connected to SS
Terminal. It is available for prevention of output voltage overshoot and inrush current. If you don’t use soft-start function,
please set SS terminal open. For the calculation of SS time, please refer to the formula on page 19.
(6) Max Duty
If this IC operates by DCDC switching Max Duty, it would not output expect voltage and LED current decrease or LED
current OFF by SCP. Please set load condition and external parts for DCDC switching Duty does not reach Max Duty.
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
5/35
TSZ02201-0T3T0C600060-1-2
2016.10.19 Rev.003

5 Page





BD81A44EFV-M arduino
BD81A44MUV-M/EFV-M
Datasheet
Electrical Characteristics (VCC=12V, Ta = -40°C to +125°C *Unless otherwise specified)
Parameter
Symbol
Min
Limit
Normal
Max Unit
Conditions
Circuit Current
ICC
-
-
10
mA
EN=High, SYNC=High, RT=OPEN
PWM=Low, ISET=OPEN,CIN=10μF
Standby Current
IST - - 10 μA EN=Low, VDISC=OPEN
[VREG]
Reference Voltage
[OUTH]
VREG
4.5 5.0 5.5 V IREG=-5mA, CREG=2.2μF
OUTH High Side ON-Resistor
RONHH
1.5
3.5
7.0 IOUTH=-10mA
OUTH Low Side ON-Resistor
RONHL
0.8
2.5
5.5 IOUTH=10mA
OCP Detection Voltage
[OUTL]
VOLIMIT
VCC-0.22 VCC-0.2 VCC-0.18 V
OUTL High Side ON-Resistor
RONLH
1.5
3.5 10.0 IOUTL=-10mA
OUTL Low Side ON-Resistor
RONLL
0.8 2.5 5.5 IOUTL=10mA
[SW]
SW Low Side
ON-Resistor
[Error AMP]
RON_SW 4.0 10.0 25.0 ISW=10mA
LED Control Voltage
VLED
0.9 1.0 1.1 V
COMP Sink Current
ICOMPSINK
35
80
145 μA VLED=2V, VCOMP=1V
COMP Source Current
[Oscillator]
ICOMPSOURCE
-145
-80
-35 μA VLED=0.5V, VCOMP=1V
Oscillation Frequency 1
fosc1
285 300 315 kHz RT=27k
Oscillation Frequency 2
fosc2
1800
2000
2200
kHz RT=3.9k
[OVP]
OVP Detection Voltage
VOVP1
1.9 2.0 2.1 V VOVP=Sweep up
OVP Hysteresis Width
VOVPHYS1
0.02
0.06
0.10 V VOVP=Sweep down
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
11/35
TSZ02201-0T3T0C600060-1-2
2016.10.19 Rev.003

11 Page







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