SI9978DW Vishay, SI9978DW Datasheet

Motor / Motion / Ignition Controllers & Drivers Half Bridge Driver

SI9978DW

Manufacturer Part Number
SI9978DW
Description
Motor / Motion / Ignition Controllers & Drivers Half Bridge Driver
Manufacturer
Vishay
Type
Configurable H-Bridge Driverr
Datasheet

Specifications of SI9978DW

Operating Supply Voltage
- 0.3 V to + 50 V
Supply Current
5 mA
Mounting Style
SMD/SMT
Package / Case
SO-24
Operating Temperature
85 C
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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Company
Part Number
Manufacturer
Quantity
Price
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SI9978DW
Quantity:
5 510
Part Number:
SI9978DW
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SI
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20 000
Part Number:
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FREESCALE
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DESCRIPTION
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
Document Number: 70011
S-40804—Rev. E, 26-Apr-04
FEATURES
D H-Bridge or Dual Half-Bridge Operation
D 20- to 40-V Supply
D Static (dc) Operation
FUNCTIONAL BLOCK DIAGRAM
FAULT/FAULT
CL/FAULT
PWM/EN
DIR/IN
EN/EN
QS/IN
MODE
R
R
A
B
BRK
V
/C
/C
V+
DD
A
B
B
A
B
A
A
B
24
12
11
1
3
5
4
6
7
2
8
9
U.V. Lockout
Low-Voltage
Regulator
Low-Side
Configurable H-Bridge Driver
V
V
V
V
V
V
V
DD
DD
DD
DD
DD
DD
DD
CAP
U.V. Lockout
High-Side
A
CAP
D Cross-Conduction Protected
D Current Limit
D Undervoltage Lockout
B
One Shot
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.
Logic
Input
One Shot
Bootstrap Reg.
Bootstrap Reg.
Charge Pump
Charge Pump
V
DD
+
+
D ESD Protected
D Fault Output
Vishay Siliconix
V
DD
23
21
22
19
17
18
20
16
15
13
14
Si9978
www.vishay.com
CAP
GT
S
CAP
GT
S
GB
GB
GND
IL
IL
A
B
A
B
A
+
+
B
A
B
A
B
1

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SI9978DW Summary of contents

Page 1

... SOIC (surface mount) packages, specified to operate over the industrial (−40 to +85_C) temperature range. CAP CAP A B High-Side DD U.V. Lockout Input Logic One Shot One Shot Si9978 Vishay Siliconix D ESD Protected D Fault Output Bootstrap Reg. 23 CAP A Charge Pump Bootstrap Reg. 19 CAP B Charge Pump 17 GT ...

Page 2

... Si9978 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Voltage on pins 2−7 with respect to ground . . . . . . . . . . . Voltage on pin Voltage on pins 17, 19, 21 Voltage on pins 18 RECOMMENDED OPERATING CONDITIONS SPECIFICATIONS Parameter Symbol Power Supply Voltage Range Logic Voltage Supply Current Inputs (DIR, PWM, EN, QS, MODE, BRK) High-State Low-State ...

Page 3

... TRUTH TABLE HALF-BRIDGE MODE DIR/ EN/ QS/ PWM MODE Document Number: 70011 S-40804—Rev. E, 26-Apr-04 BRK BRK Si9978 Vishay Siliconix CL/ FAULT/ FAULT FAULT Undervoltage CL/ FAULT/ FAULT FAULT Overcurrent Overcurrent Undervoltage www.vishay.com Condition Normal Normal Operation Brake Disable Overcurrent Condition Normal Normal Operation ...

Page 4

... When at logic “1”, the high-side MOSFET is turned on, and when at logic “0”, the low-side MOSFET is turned on. Lead (Pb)-Free Temperature Part Number Range Package −40 to 85_C 40 to 85_C (Wide Body) Si9978DW-T1— Document Number: 70011 S-40804—Rev. E, 26-Apr-04 SOIC-24 SOIC-24 ...

Page 5

... The timing resistor and capacitor for the current limit one-shot are connected to this pin. The values of the resistor and capacitor determine the off time set by the one-shot. The Document Number: 70011 S-40804—Rev. E, 26-Apr-04 Vishay Siliconix one-shot is triggered when the current limit comparator detects an overcurrent condition. Pin 13 and Pin 14, IL ...

Page 6

... Si9978 Vishay Siliconix APPLICATION CIRCUIT EN/EN 3 DIR DIR/IN 4 PWM PWM/ QS/IN 6 MODE 7 BRK BRK FAULT F 100 GND www.vishay.com CAP CAP GND Si9978 FIGURE 1. Basic H-Bridge Circuit LITTLE FOOTr OUT OUT Document Number: 70011 S-40804—Rev. E, 26-Apr-04 ...

Page 7

... Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’ ...

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