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| 型号： | SI9978DW-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 1/9页 |
| 文件大小： | 0K |
| 描述： | IC FET DRIVER H-BRIDGE 1A 24SOIC |
| 标准包装： | 1,500 |
| 配置： | H 桥，半桥 |
| 输入类型： | 非反相 |
| 延迟时间： | 600ns |
| 配置数： | 1，2 |
| 输出数： | 4 |
| 电源电压： | 14.5 V ~ 17.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
Si9978
Vishay Siliconix
Configurable H-Bridge Driver
FEATURES
D H-Bridge or Dual Half-Bridge Operation
D 20- to 40-V Supply
D Static (dc) Operation
DESCRIPTION
D Cross-Conduction Protected
D Current Limit
D Undervoltage Lockout
D ESD Protected
D Fault Output
The Si9978 is an integrated driver for an n-channel MOSFET
H-bridge. The mode control allows operation as either a full
H-bridge driver or as two independent half-bridges. The
DIR/PWM input configuration allows easy implementation of
either sign/magnitude or anti-phase PWM drive schemes for
full H-bridges. Schmitt triggers on the inputs provide logic
signal compatibility and hysteresis for increased noise
immunity. An internal low-voltage regulator allows the device
to be powered directly from a system supply of 20 to 40 volts.
All n-channel gates are driven directly from low-impedance
outputs. The addition of one external capacitor per half-bridge
allows internal circuitry to level shift both the power supply and
FUNCTIONAL BLOCK DIAGRAM
logic signal for the high-side n-channel gate drives. Internal
charge pumps replace leakage current lost in the high-side
driver circuits to provide “static” (dc) operation in any output
condition. Protection features include an undervoltage
lockout, cross-conduction prevention logic, and overcurrent
monitors.
The Si9978 is available in both standard and lead (Pb)-free,
24-pin wide-body SOIC (surface mount) packages, specified
to operate over the industrial ( ? 40 to +85 _ C) temperature
range.
V+
24
Low-Voltage
Regulator
CAP A
CAP B
Bootstrap Reg.
Charge Pump
23
21
CAP A
GT A
V DD
1
Low-Side
U.V. Lockout
V DD
High-Side
U.V. Lockout
Bootstrap Reg.
Charge Pump
22
19
S A
CAP B
DIR/IN A
QS/IN B
PWM/EN B
MODE
BRK
EN/EN A
3
5
4
6
7
2
V DD
V DD
V DD
V DD
V DD
V DD
Input
Logic
V DD
V DD
17
18
20
16
GT B
S B
GB A
GB B
CL/FAULT B
FAULT/FAULT A
8
9
15
GND
R A /C A
R B /C B
11
12
One Shot
One Shot
?
+
?
+
13
14
IL A +
IL B +
Document Number: 70011
S-40804—Rev. E, 26-Apr-04
www.vishay.com
1
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