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UA78S40

更新时间： 2024-11-23 12:47:15
品牌 Logo 应用领域
安森美 - ONSEMI 稳压器开关通用开关
页数 文件大小 规格书
8页 128K
描述
UNIVERSAL SWITCHING REGULATOR SUBSYSTEM

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中文翻译

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UA78S40 数据手册

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Order this document µA78S40/D  
µ
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.  
SEMICONDUCTOR  
TECHNICAL DATA  
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  
P SUFFIX  
PLASTIC PACKAGE  
CASE 648  
PIN CONNECTIONS  
Switch Collector  
Driver Collector  
Diode Cathode  
Diode Anode  
Switch Emitter  
1
2
3
16  
15  
14  
Simplified Block Diagram  
Noninv.  
Input  
Inv.  
Input  
Timing  
Capacitor  
I
Driver  
Collector Collector  
Switch  
I
Sense  
pk  
pk  
Sense  
Gnd  
11  
V
CC  
V
Op Amp Output  
4
5
6
7
8
13  
12  
11  
10  
9
CC  
9
10  
12  
13  
14  
15  
16  
Timing Capacitor  
V
Op Amp  
Noninv.  
CC  
Ground  
Op  
Comparator  
Inv. Input  
Comparator  
Noninv. Input  
Amp  
Inv. Input  
C
I
pk  
T
Oscilator  
S
R
Q
Reference  
(Top View)  
–
Comp.  
+
170  
1.25V  
Reference  
–
Op  
Amp  
D1  
+
ORDERING INFORMATION  
Temperature  
8
7
6
5
4
3
2
1
Range  
Device  
Package  
Ref  
Output  
Inv  
Input  
Noninv  
Input  
V
Output  
Switch  
Emitter  
Diode  
Anode  
Diode  
Cathode  
CC  
Op Amp  
µA78S40PC  
µA78S40PV  
T
= 0° to +70°C  
Plastic  
Plastic  
A
(Bottom View)  
T
= – 40° to +85°C  
A
Motorola, Inc. 1996  
Rev 1  
12345678

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