DataSheet.jp

UA78S40 の電気的特性と機能

UA78S40のメーカーはON Semiconductorです、この部品の機能は「UNIVERSAL SWITCHING REGULATOR SUBSYSTEM」です。


製品の詳細 ( Datasheet PDF )

部品番号 UA78S40
部品説明 UNIVERSAL SWITCHING REGULATOR SUBSYSTEM
メーカ ON Semiconductor
ロゴ ON Semiconductor ロゴ 




このページの下部にプレビューとUA78S40ダウンロード(pdfファイル)リンクがあります。

Total 7 pages

No Preview Available !

UA78S40 Datasheet, UA78S40 PDF,ピン配置, 機能
UA78S40
Universal Switching
Regulator Subsystem
The mA78S40 is a switching regulator subsystem, consisting of a
temperature compensated voltage reference, controlledduty cycle
oscillator with an active current limit circuit, comparator, highcurrent
and highvoltage output switch, capable of 1.5 A and 40 V, pinnedout
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 widesupply voltage range, low standby current, high
efficiency and low drift. The mA78S40 is available in commercial
(0° to + 70°C), and automotive (40° to + 85°C) temperature ranges.
Some of the applications include use in stepup, stepdown, 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
Noninv.
Input
9
Inv.
Input
10
Timing
Gnd Capacitor
11 12
VCC
13
Ipk
Sense
14
Driver Switch
Collector Collector
15 16
CT Ipk
Oscillator
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)
NOTE: This device contains 84 active
transistors.
Figure 1. Simplified Block Diagram
16
1
http://onsemi.com
MARKING
DIAGRAM
16
PDIP16
P SUFFIX
CASE 648
UA78S40Px
AWLYYWW
1
x = C or V
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
PIN CONNECTIONS
Diode Cathode 1
16 Switch Collector
Diode Anode 2
15 Driver Collector
Switch Emitter 3
14 Ipk Sense
Op Amp Output 4
13 VCC
VCC Op Amp 5
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
Package
Shipping
mA78S40PC
PDIP16
25 Units/Rail
mA78S40PV
PDIP16
25 Units/Rail
© Semiconductor Components Industries, LLC, 2006
July, 2006 Rev. 3
1
Publication Order Number:
UA78S40/D

1 Page





UA78S40 pdf, ピン配列
UA78S40
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
CurrentLimit 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)
PowerSupply 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 kW to Gnd, 1.0 V VO 2.5 V)
Voltage Gain (TA = 25°C)
(RL = 2.0 kW to 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)
PowerSupply 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
20 50
20 70
150 250
150 350
0.5
tchg/tdis 6.0
VCLS 250 350
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
IIB
IIO
AVOL+
4.0 15
30 200
5.0 75
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
mA
mA
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/ms
V
V
http://onsemi.com
3


3Pages


UA78S40 電子部品, 半導体
Vin
15V
100
+
9
UA78S40
CT
1800
pF
RSC
0.30
D45H8
1N5822
Vout
−15V/500mA
100
50mH
270
L
100 + CO
10 11 12 13 14 15 16
VCC
CT Ipk
Oscillator
SQ
1.25V
Reference
Comp.
+
Op
+Amp
R
170
D1
R1 8
1.5k
R2
18k
765 43 2 1
Figure 8. Inverting Converter
Design Formula Table
Calculation
ton
toff
(ton + toff) max
CT
Ipk(switch)
StepDown
Vout + VF
Vin(min) Vsat Vout
I
fmin
4 x 10 5 ton
2 Iout(max)
StepUp
Vout VF Vin(min)
Vin(min) Vsat
I
fmin
4 x 10 5 ton
2 Iout(max)
ton toff
toff
RSC
0.33
Ipk(switch)
0.33
Ipk(switch)
L(min)
Vin(min) Vsat Vout
Ipk(switch)
ton(max)
Vin(min) Vsat
Ipk(switch)
ton(max)
CO
Ipk(switch) (ton + toff)
Iout ton
8 Vripple(pp)
Vripple
Vsat = Saturation voltage of the output switch. VF = Forward voltage drop of the ringback rectifier.
Inverting
Vout + VF
Vin(min) Vsat
I
fmin
4 x 10 5 ton
2 Iout(max)
ton + toff
toff
0.33
Ipk(switch)
Vin(min) Vsat
Ipk(switch)
ton(max)
Iout ton
Vripple
The following power supply characteristics must be chosen:
Vin Nominal input voltage. If this voltage is not constant, then use Vin(max) for stepdown and Vin(min) for stepup and inverting convertor.
ǒ ǓVout Desired output voltage: Vout = 1.25
1
)
R2
R1
for stepdown and stepup:
Vout
+
1.25 R2
R1
for inverting.
Iout Desired output current.
fmin Minimum desired output switching frequency at the selected values for Vin and IO.
Vripple(pp) Desired peaktopeak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor’s equivalent
series resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation.
See Application Note AN920 for further information
http://onsemi.com
6

6 Page



ページ 合計 : 7 ページ
 
PDF
ダウンロード
[ UA78S40 データシート.PDF ]


データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。


共有リンク

Link :


部品番号部品説明メーカ
UA78S40

UNIVERSAL SWITCHING REGULATOR SUBSYSTEM

ON Semiconductor
ON Semiconductor
UA78S40

UNIVERSAL SWITCHING REGULATOR SUBSYSTEM

Fairchild
Fairchild


www.DataSheet.jp    |   2020   |  メール    |   最新    |   Sitemap