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BD6586MUV PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD6586MUV
기능 4-Channel White LED Driver
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BD6586MUV 데이터시트, 핀배열, 회로
Datasheet
4-Channel White LED Driver
with Integrated FET for up to 24 LEDs
BD6586MUV
General Description
BD6586MUV is white LED driver IC with PWM step-up
DC/DC converter that can boost max 24V and current
driver that can drive max 25mA. The wide and
precision brightness can be controlled by external
PWM pulse.
BD6586MUV has very accurate current drivers, and it
has few current errors between each strings. So, it will
be helpful to reduce brightness spots on the LCD.
Small package type is suited for saving space.
Key Specifications
Operating power supply voltage range: 2.7V to 5.5V
LED maximum current:
25mA (Max.)
Quiescent Current:
0.1μA (Typ.)
Switching frequency:
1.0MHz(Typ.)
Operating temperature range:
-40 to +85
Package W(Typ.) x D(Typ.) x H(Max.)
Features
High accuracy & good matching (±3.0%) current
drivers 4ch (MAX.25mA/ch)
28V power Nch MOSFET
Soft Start
Drive up to 6 in series, 4 strings in parallel
Rich safety functions
Over-voltage protection
Output Short protection
External SBD open detect
Over current limit
Thermal shutdown
UVLO
VQFN024V4040
4.00mm x 4.00mm x 1.00mm
Figure 1.
Typical Application Circuit
Battery
2.7V to 5.5V
Applications
All middle size LCD equipments backlight of Notebook
PC, portable DVD player, car navigation systems, etc.
4 .7μ F
4. 7μ H
2. 2μF
1 μF
6LED x 4Parallel
1 00H z~1 kHz
PWM
SW SW SW
TRSW
VBAT VDET
EN2
EN1
PWM
TESTO
TEST PGND PGND GND
GND GND
L ED 1
LED2
L ED 3
L ED 4
ISET
2 4k
Each 20mA
Can be set up to each 10~25mA
Figure 2. Typical Application Circuit
(Power control PWM application)
Product structure Silicon monolithic integrated circuit
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
This product is not designed protection against radioactive rays
1/20
TSZ02201-0G3G0C400190-1-2
10.Dec.2012 Rev.001




BD6586MUV pdf, 반도체, 판매, 대치품
BD6586MUV
Block Diagram
Datasheet
Current
SENSE
Pin number 24pin
Figure 4. Block diagram
Description of Functions
1) PWM current mode DC/DC converter
While BD6586MUV is power ON, the lowest voltage of LED1, 2, 3, 4 is detected, PWM duty is decided to be 0.5V
and output voltage is kept invariably. As for the inputs of the PWM comparator as the feature of the PWM current mode,
one is overlapped with error components from the error amplifier, and the other is overlapped with a current sense signal
that controls the inductor current into Slope waveform to prevent sub harmonic oscillation. This output controls internal
Nch Tr via the RS latch. In the period where internal Nch Tr gate is ON, energy is accumulated in the external inductor,
and in the period where internal Nch Tr gate is OFF, energy is transferred to the output capacitor via external SBD.
BD6586MUV has many safety functions, and their detection signals stop switching operation at once.
2) Soft start
BD6586MUV has soft start function.
The soft start function prevents large coil current.
Rush current at turning on is prevented by the soft start function.
After EN1, EN2 are changed LH, soft start becomes effective for within 1ms and soft start doesn't become effective
even if EN1, EN2 are changed LH after that.
And, when the H section of PWM is within 1ms, soft start becomes invalid when PWM is input to H more than three times.
The invalid of the soft start can be canceled by making EN1, EN2, PWM L.
And, a soft start function doesn't work after a protection function release.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
4/20
TSZ02201-0G3G0C400190-1-2
10.Dec.2012 Rev.001

4페이지










BD6586MUV 전자부품, 판매, 대치품
BD6586MUV
Datasheet
Brightness Control
There are two dimming method is available, first method is analog dimming that apply analog voltage to ISETH terminal,
and second method is PWM control via digital dimming of EN1, EN2 PWM terminals or PWM. Because each method has
the different merit, please choose a suitable method for the application of use.
Refer to Figure 25 for the analog dimming.
Two techniques can be used as digital dimming by the PWM control. One is PWM control of current driver, the other is
PWM control of power control.
As these two characteristics are shown in the below, selects to PWM control process comply with application.
•Efficiency emphasis in the low brightness which has an influence with the battery life
•LED current dispersion emphasis in the PWM brightness control
2) Power control PWM control
1) Current driver PWM control
(Reference)
PWM regulation process
Current driver
Power control
Efficiency of LED current 0.2mA
(PWM Duty=1%)
60%
94%
PWM frequency 200Hz
Low Duty
0.1%
0.6%
1) Current driver PWM control is controlled by providing PWM signal to PWM terminal, as it is shown Figure 7.
The current set up with ISET is chosen as the H section of PWM and the current is off as the L section. Therefore, the
average LED current is increasing in proportion to duty cycle of PWM signal. This method that it lets internal circuit and
DC/DC to work, because it becomes to switch the driver, the current tolerance is a few when the PWM brightness is
adjusted, it makes it possible to brightness control until 20µs (MIN0.4% at 200Hz). And, don't use for the brightness
control, because effect of ISET changeover is big under 20µs ON time and under 20µs OFF time. There is no effect of
ON/OFF changeover at 0% and 100%, so there is no problem on use. Typical PWM frequency is 100Hz to 10kHz.
PWM
ON OFF
LED current
ON OFF
Coil current
ON OFF
IC’s active current
ON
Figure 7. Current driver PWM control
2) Power control PWM control is controlled by providing PWM signal to EN1, EN2 as it is shown Figure 8. The current
setting set up with PWM logic is chosen as the H section and the current is off as the L section. Therefore, the average
LED current is increasing in proportion to duty cycle of EN1, EN2 signal. This method is, because IC can be power-off at
off-time, the consumption current can be suppress, and the high efficiency can be available, so it makes it possible to
brightness control until 50µs (MIN1% at 200Hz). And, don't use for the brightness control, because effect of power
ON/OFF time changeover is big under 50µs ON time and under 50µs OFF time. There is no effect of ON/OFF
changeover at 0% and 100%, so there is no problem on use. Typical PWM frequency is 100Hz to 1kHz.
EN1,EN2
LED current
Coil current
IC’s active current
ON
ON
ON
ON
OFF
OFF
OFF
OFF
Figure 8. Power control PWM control
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 15 001
7/20
TSZ02201-0G3G0C400190-1-2
10.Dec.2012 Rev.001

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부품번호상세설명 및 기능제조사
BD6586MUV

4-Channel White LED Driver

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