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PDF 78S40 Data sheet ( Hoja de datos )
| Número de pieza | 78S40 | |
| Descripción | UNIVERSAL SWITCHING REGULATOR SUBSYSTEM | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 78S40 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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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
1 page  
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
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 78S40.PDF ] | |
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