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| 型号： | BD6581GU-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 14/35页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT BCKLGHT VCSP85H2 |
| 标准包装： | 3,000 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 800kHz ~ 1.2MHz |
| 电源电压： | 2.7 V ~ 22 V |
| 输出电压： | 44.7 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 23-VFBGA，CSPBGA |
| 供应商设备封装： | VCSP85H2 |
| 包装： | 带卷 (TR) |
| 工作温度： | -30°C ~ 85°C |
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BD6581GU
(Example 2)
In case of, VIN=12.0V, L=4.7μH, fsw=1MHz, VOUT=39V, IOUT=80mA, Efficiency=85%
Ipeak = (12.0V / 4.7μH) x (1 / 1MHz) x (1-(12V / 39V)) =1.77A
Datasheet
Ton = (0.31A x (1-12 V / 39V) x (1 / 1MHz) x ( 4.7μH /12 V) x 2)
Iave = (39V x 80mA / 12.0V) / 85% = 0.31A
1/2
= 0.41μs
(1-VIN/VOUT) x (1/fsw)=0.69μs > Ton
Peak current = 12V/4.7μH x 0.41μs = 1.05A
*When too large current is set, output overshoot is caused, be careful enough because it is led to break down of the IC
in case of the worst.
● Operating of the Application Deficiency
1) When 1 LED or 1parallel OPEN during the operating
In case of FAILSEL=L, the LED parallel which became OPEN isn't lighting, but other LED parallel is lighting.
At that time, output boosts up to the over voltage protection voltage 44.7V so that LED terminal may be 0V or it boost to
the output voltage that LED terminal voltage becomes LED terminal over voltage protection 11.5V or it becomes the
output voltage restricted by the over current limit.
In case of FAILSEL=H, boost stops when LED becomes OPEN and all LED turns off the lights.
2) When LED short-circuited in the plural
In case of FAILSEL=L, all LED is turned on unless LED terminal voltage is LED terminal over voltage protection of more
than 11.5V. When it was more than 11.5V only the line which short-circuited is turned on normally and LED current of
other lines fall or turn off the lights. In case of FAILSEL=H, boost stops at more than 11.5V and all LED turns off the lights.
3) When Schottky diode came off
Regardless of FAILSEL, all LED isn't turned on. Also, IC and a switching transistor aren't destroyed because boost
operating stops by the Schottky diode coming off protected function.
4)When over current detection resistor came off
Regardless of FAILSEL, all LED isn't turned on. Because the resistance of 100k ? is between SENSP and SENSN
terminal, over current protection works instantly and LED current can't be flow.
● Control Signal Input Timing
2.7V 5V
VBAT
①
②
Min. 100 μ s
5V
0V
RSTB
③
VBAT
PWMPOW
PWMDRV
VREG
5V
220 ?
PIN
GND
Rin
DC/DC VOUT
Figure 28. control Signal timing
Figure 29. Voltage with a control sign higher than VBAT
Example corresponding to application of conditions
In case you input control signs, such as RSTB, PWMPOW, and PWMDRV, in the condition that the standup of supply
voltage (VBAT) is not completed, be careful of the following point.
① Input each control signal after VBAT exceeds 2.7V.
② Please do not input each control sign until VBAT exceeds HI voltage of RSTB, PWMPOW, and PWMDRV.
③ When you input RSTB during the standup of VBAT and HI voltage is inputted into PWMPOW,
please give the standup time to stable voltage as Min.100μs 2.7V of VBAT.
There is no timing limitation at each input signal of RSTB, PWMPOW and PWMDRV.
If each control sign changes into a condition lower than VBAT in (1) and (2), it goes via the ESD custody diode by the side
of VBAT of each terminal. A power supply is supplied to VBAT and there is a possibility of malfunctioning. Moreover, when
the entrance current to the terminal exceeds 50mA, it has possibility to damage the LSI. In order to avoid this condition, as
shown in the above figure, please insert about 220ohm in a signal line, and apply current qualification. Please confirm an
internal pull down resistor in the block diagram and electrical property of P.5.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
14/32
TSZ02201-0G3G0C400170-1-2
03.Dec.2012 Rev.001
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