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參數(shù)資料
| 型號(hào)： | 78S40 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 124K |
| 代理商： | 78S40 |
μ
A78S40
6
MOTOROLA ANALOG IC DEVICE DATA
CT
Ipk
Oscilator
–
+Comp.
–
+
Op
Amp
1.25V
Reference
S
R
Q
170
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D1
R1
1.5k
1N5822
+
100
CT
Vin
15V
1800
pF
RSC
0.30
50
μ
H
L
100
Vout
–15V/500mA
100
+
CO
R2
18k
VCC
270
D45H8
Figure 7. Inverting Converter
Design Formula Table
fmin
Vin(min) Vsat
I
Calculation
Step–Down
Step–Up
Inverting
ton
toff
Vout + VF
Vout – VF Vin(min)
Vout + VF
Vin(min) – Vsat
Vin(min) – Vsat – Vout
I
(ton + toff) max
fmin
fmin
I
CT
4 x 10 5 ton
2 Iout(max)
4 x 10 5 ton
4 x 10 5 ton
Ipk(switch)
ton – toff
toff
ton + toff
toff
2 Iout(max)
2 Iout(max)
RSC
0.33
Ipk(switch)
0.33
Ipk(switch)
0.33
Ipk(switch)
L(min)
Vin(min) – Vsat – Vout
Ipk(switch)
Vin(min) – Vsat
Ipk(switch)
Vin(min) – Vsat
Ipk(switch)
ton(max)
ton(max)
ton(max)
CO
Ipk(switch) (ton + toff)
8 Vripple(pp)
Iout ton
Vripple
Iout ton
Vripple
Vsat = Saturation voltage of the output switch. VF = Forward voltage drop of the ringback rectifier.
≈
≈
The following power supply characteristics must be chosen:
– Nominal input voltage. If this voltage is not constant, then use Vin(max) for step–down and Vin(min) for step–up and inverting convertor.
R2
R1
Iout
fmin
Vripple(pp)
– Desired output voltage: Vout = 1.25
– Desired output current.
– Minimum desired output switching frequency at the selected values for Vin and IO.
– Desired peak–to–peak 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
for step–down and step–up:
for inverting.
1
Vout
1.25 R2
R1
Vin
Vout
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