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參數資料
| 型號： | 78S40 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關穩壓器 |
| 文件頁數： | 1/8頁 |
| 文件大?。?/td> | 124K |
| 代理商： | 78S40 |
Device
Temperature
Range
Package
μ
SEMICONDUCTOR
TECHNICAL DATA
UNIVERSAL
SWITCHING REGULATOR
SUBSYSTEM
ORDERING INFORMATION
μ
A78S40PC
μ
A78S40PV
TA = 0
°
to +70
°
C
TA = – 40
°
to +85
°
C
Plastic
Plastic
PIN CONNECTIONS
Order this document
μ
A78S40/D
P SUFFIX
PLASTIC PACKAGE
CASE 648
11
5
2
1
9
10
12
13
14
15
16
8
7
6
4
3
(Top View)
Diode Anode
Reference
Inv. Input
Noninv.
VCC Op Amp
Op Amp Output
Switch Emitter
Diode Cathode
Op
Amp
Comparator
Noninv. Input
Comparator
Inv. Input
Ground
Timing Capacitor
VCC
Ipk Sense
Driver Collector
Switch Collector
1
MOTOROLA ANALOG IC DEVICE DATA
The
μ
A78S40 is a switching regulator subsystem, consisting of a
temperature compensated voltage reference, controlled–duty cycle
oscillator with an active current limit circuit, comparator, high–current and
high–voltage output switch, capable of 1.5 A and 40 V, pinned–out power
diode and an uncommitted operational amplifier, which can be powered up or
down independent of the IC supply. The switching output can drive external
NPN or PNP transistors when voltages greater the 40 V, or currents in
excess of 1.5 A, are required. Some of the features are wide–supply voltage
range, low standby current, high efficiency and low drift. The
μ
A78S40 is
available in commercial (0
°
to + 70
°
C), and automotive (–40
°
to + 85
°
C)
temperature ranges.
Some of the applications include use in step–up, step–down, and
inverting regulators, with extremely good results obtained in battery–
operated systems.
Output Adjustable from 1.25 V to 40 V
Peak Output Current of 1.5 A Without External Transistor
80 dB Line and Load Regulation
Operation from 2.5 V to 40 V Supply
Low Standby Current Drain
High Gain, High Output Current, Uncommitted Op Amp
Simplified Block Diagram
CT
Ipk
Oscilator
–
+Comp.
–
+
Op
Amp
1.25V
Reference
S
R
Q
170
8
(Bottom View)
Ref
Output
Output
9
D1
Inv
Input
Noninv
Input
VCC
Op Amp
Switch
Emitter
Diode
Anode
Diode
Cathode
Noninv.
Input
Inv.
Input
10
Gnd
11
Timing
Capacitor
12
VCC
13
Ipk
Sense
14
Driver
Collector
15
Switch
Collector
16
7
6
5
4
3
2
1
Motorola, Inc. 1996
Rev 1
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