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78S40 Datasheet

UNIVERSAL SWITCHING REGULATOR SUBSYSTEM


78S40 Datasheet Preview


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
Page 1

µA78S40
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage
Op Amp Power Supply Voltage
Common Mode Input Range
(Comparator and Op Amp)
VCC
VCC (Op Amp)
VICR
40
40
–0.3 to VCC
V
V
V
Differential Input Voltage (Note 2)
Output Short Circuit Duration (Op Amp)
VID ± 30 V
Continuous
Reference Output Current
Voltage from Switch Collectors to Gnd
Iref 10 mA
40 V
Voltage from Switch Emitters to Gnd
40 V
Voltage from Switch Collectors to Emitter
40 V
Voltage from Power Diode to Gnd
40 V
Reverse–Power Diode Voltage
Current through Power Switch
Current through Power Diode
Power Dissipation and Thermal Characteristics:
Plastic Package (TA = + 25°C)
Derate above + 25°C (Note 1)
Storage Temperature Range
Operating Temperature Range
µA78S40V
µA78S40C
VDR
ISW
ID
PD
1/RθJA
Tstg
TA
40 V
1.5 A
1.5 A
1500
14
–65 to + 150
–40 to +85
0 to +70
mW
mW/°C
°C
°C
NOTES: 1. Tlow = –40° for µA78S40PV
= 0° for µA78S40PC
Thigh = +85° for µA78S40PV
= +70° for µA78S40PC
2. For supply voltages less than 30 V the maximum differential input voltage (Error Amp
and Op Amp) is equal to the supply voltage.
ELECTRICAL CHARACTERISTICS (VCC = VCC (Op Amp) 5.0 V, TA = Tlow to Thigh, unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
GENERAL
Supply Voltage
Supply Current (Op Amp VCC, disconnected)
(VCC = 5.0 V)
(VCC = 40 V)
Supply Current (Op Amp VCC, connected)
(VCC = 5.0 V)
(VCC = 40 V)
VCC
ICC
ICC
2.5 – 40
– 1.8 3.5
– 2.3 5.0
– – 4.0
– – 5.5
REFERENCE
Reference Voltage
(Iref = 1.0 mA)
Reference Voltage Line Regulation
(3.0 V VCC 40 V, Iref = 1.0 mA, TA = 25°C)
Reference Voltage Load Regulation
(1.0 mA Iref 10 mA, TA = 25°C)
Vref
Regline
Regload
1.180
1.245
0.04
0.2
1.310
0.2
0.5
Unit
V
mA
mA
V
mV/V
mV/mA
2 MOTOROLA ANALOG IC DEVICE DATA
Page 2

µA78S40
ELECTRICAL CHARACTERISTICS (VCC = VCC (Op Amp) 5.0 V, TA = Tlow to Thigh, unless otherwise noted.)
Characteristic
Symbol Min Typ Max
OSCILLATOR
Charging Current (TA = 25°C)
(VCC = 5.0 V)
(VCC = 40 V)
Discharging Current (TA = 25°C)
(VCC = 5.0 V)
(VCC = 40 V)
Oscillator Voltage Swing (TA = 25°C)
(VCC = 5.0 V)
Ratio of Charge/Discharge Time
CURRENT LIMIT
Current–Limit Sense Voltage (TA = 25°C)
(VCC – Vlpk Sense)
OUTPUT SWITCH
Output Saturation Voltage 1
(ISW = 1.0 A, Pin 15 tied to Pin 16)
Output Saturation Voltage 2
(ISW = 1.0 A, I15 = 50 mA)
Output Transistor Current Gain (TA = 25°C)
(IC = 1.0 A, VCE = 5.0 V)
Output Leakage Current (TA = 25°C)
(VCE = 40 V)
POWER DIODE
Forward Voltage Drop (ID = 1.0 A)
Diode Leakage Current (TA = 25°C) (VDR = 40 V)
COMPARATOR
Input Offset Voltage (VCM = Vref)
Input Bias Current (VCM = Vref)
Input Offset Current (VCM = Vref)
Common Mode Voltage Range (TA = 25°C)
Power–Supply Rejection Ratio (TA = 25°C)
(3.0 VCC 40 V)
OUTPUT OPERATION AMPLIFIER
Input Offset Voltage (VCM = 2.5 V)
Input Bias Current (VCM = 2.5 V)
Input Offset Current (VCM = 2.5 V)
Voltage Gain + (TA = 25°C)
(RL = 2.0 kto Gnd, 1.0 V VO 2.5 V)
Voltage Gain – (TA = 25°C)
(RL = 2.0 kto VCC (Op Amp), 1.0 V VO 2.5 V)
Common Mode Voltage Range (TA = 25°C)
Common Mode Rejection Ratio (TA = 25°C)
(VCM = 0 V to 3.0 V)
Power–Supply Rejection Ratio (TA = 25°C)
(3.0 V VCC (Op Amp) 40 V)
Output Source Current (TA = 25°C)
Output Sink Current (TA = 25°C)
Slew Rate (TA = 25°C)
Output Low Voltage (TA = 25°C, IL = –5.0 mA)
Output High Voltage (TA = 25°C, IL = 50 mA)
Ichg
Idis
Vosc
tchg/tdis
VCLS
20
20
150
150
250
– 50
– 70
– 250
– 350
0.5 –
6.0 –
– 350
Vsat1
Vsat2
hFE
IC(off)
– 0.93 1.3
– 0.5 0.7
– 70 –
– 10 –
VD
IDR
VIO
IIB
IIO
VICR
PSRR
– 1.25 1.5
– 10 –
– 1.5 15
– 35 200
– 5.0 75
0 – VCC – 2.0
70 96 –
VIO – 4.0 15
IIB – 30 200
IIO – 5.0 75
AVOL+ 25 250 –
AVOL– 25 250 –
VICR 0 – VCC – 2.0
CMRR 76 100 –
PSRR
76 100 –
ISource
ISink
SR
VOL
VOH
75
10
VCC(Op Amp)
– 3.0
150
35
0.6
1.0
Unit
µA
µA
V
mV
V
V
nA
V
nA
mV
nA
nA
V
dB
mV
nA
nA
V/mV
V/mV
V
dB
dB
mA
mA
V/µs
V
V
MOTOROLA ANALOG IC DEVICE DATA
3
Page 3
Part Number 78S40
Manufactur ON Semiconductor
Description UNIVERSAL SWITCHING REGULATOR SUBSYSTEM
Total Page 8 Pages
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