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What is 78S40?

This electronic component, produced by the manufacturer "ON Semiconductor", performs the same function as "UNIVERSAL SWITCHING REGULATOR SUBSYSTEM".


78S40 Datasheet PDF - ON Semiconductor

Part Number 78S40
Description UNIVERSAL SWITCHING REGULATOR SUBSYSTEM
Manufacturers ON Semiconductor 
Logo ON Semiconductor Logo 


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Universal Switching
Regulator Subsystem
The µA78S40 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 µA78S40 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
Order this document µA78S40/D
µA78S40
UNIVERSAL
SWITCHING REGULATOR
SUBSYSTEM
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
PIN CONNECTIONS
Simplified Block Diagram
Noninv.
Input
9
Inv.
Input
10
Timing
Gnd Capacitor VCC
11 12 13
Ipk
Sense
14
Driver
Collector
15
Switch
Collector
16
CT Ipk
Oscilator
SQ
1.25V
Reference
Comp.
+
Op
Amp
+
R
170
D1
8
Ref
Output
765 43 2 1
Inv Noninv VCC Output Switch Diode Diode
Input Input Op Amp
Emitter Anode Cathode
(Bottom View)
MOTOROLA ANALOG IC DEVICE DATA
Diode Cathode 1
16 Switch Collector
Diode Anode 2
15 Driver Collector
Switch Emitter 3
14 Ipk Sense
Op Amp Output 4
VCC Op Amp 5
13 VCC
12 Timing Capacitor
Op Noninv. 6
Amp Inv. Input 7
Reference 8
11 Ground
10
Comparator
Inv. Input
9
Comparator
Noninv. Input
(Top View)
ORDERING INFORMATION
Device
Temperature
Range
Package
µA78S40PC TA = 0° to +70°C
µA78S40PV TA = – 40° to +85°C
Plastic
Plastic
© Motorola, Inc. 1996
Rev 1
1

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78S40 equivalent
Vin
25V
100
+
µA78S40
Figure 5. Step–Down Converter
CT
470
pF
RSC
0.33
9 10 11 12 13 14 15 16
VCC
CT Ipk
Oscilator
SQ
1.25V
Reference
Comp.
+
Op
Amp
+
R
170
D1
8
R2
3.6k
R1 1.2k
765 43 2 1
*
* Use external rectifier to increase circuit efficiency
1N5822
L
220µH
470
Vout
5.0V/500mA
+
CO
Vin
12V
100
+
Figure 6. Step–Up Converter
L
CT
1500
pF
RSC
0.22
170µH
180
9 10 11 12 13 14 15 16
VCC
CT Ipk
Oscilator
SQ
1.25V
Reference
Comp.
+
Op
+Amp
R
170
D1
8
R2
47k
R1 22k
765 43 2 1
1N5822
*
* Use external rectifier to increase circuit efficiency
Vout
28V/175mA
+
150 CO
MOTOROLA ANALOG IC DEVICE DATA
5


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for 78S40 electronic component.


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Featured Datasheets

Part NumberDescriptionMFRS
78S40The function is Universal Switching Regulator Subsystem. National SemiconductorNational Semiconductor
78S40The function is UNIVERSAL SWITCHING REGULATOR SUBSYSTEM. ON SemiconductorON Semiconductor

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