参数资料
| 型号： | BD8963EFJ-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 8/23页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 8HTSOP |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1 V ~ 2.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-HTSOP-J |
| 其它名称： | BD8963EFJ-E2DKR |
BD8963EFJ
Datasheet
Application Information
● Operation
○ Synchronous rectifier
It does not require the power to be dissipated by a rectifier externally connected to a conventional DC/DC converter IC,
and its P.N junction shoot-through protection circuit limits the shoot-through current during operation, by which the
power dissipation of the set is reduced.
○ Current mode PWM control
Synthesizes a PWM control signal with a inductor current feedback loop added to the voltage feedback.
? PWM (Pulse Width Modulation) control
The oscillation frequency for PWM is 1 MHz. SET signal form OSC turns ON a P-channel MOS FET (while a
N-channel MOS FET is turned OFF), and an inductor current I L increases. The current comparator (Current Comp)
receives two signals, a current feedback control signal (SENSE: Voltage converted from I L ) and a voltage feedback
control signal (FB), and issues a RESET signal if both input signals are identical to each other, and turns OFF the
P-channel MOS FET (while a N-channel MOS FET is turned ON) for the rest of the fixed period. The PWM control
repeat this operation.
SENSE
V OUT
Level
Shift FB
Gm Amp.
COMP
Current
Comp
RESET
SET
OSC
R Q
S
Driver
Logic
SW
I L
Load
V OUT
Fig.18 Diagram of current mode PWM control
Current
Comp
SET
RESET
SW
PVCC
GND
GND
GND
SENSE
FB
Current
Comp
SET
RESET
SW
I L
I L (AVE)
V OUT
Fig.19 PWM switching timing chart
V OUT (AVE)
V OUT
www.rohm.com
?2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
8/21
TSZ02201-0J3J0AJ00040-1-2
02.MAR.2012 Rev.001
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