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MA78S40PC Datasheet(PDF) 6 Page - ON Semiconductor

Part # MA78S40PC
Description  UNIVERSAL SWITCHING REGULATOR SUBSYSTEM
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MA78S40PC Datasheet(HTML) 6 Page - ON Semiconductor

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µA78S40
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
1213
141516
D1
R1
1.5k
1N5822
+
100
CT
Vin
15V
1800
pF
RSC
0.30
50
µHL
100
Vout
–15V/500mA
100
+
CO
R2
18k
VCC
270
D45H8
Figure 7. Inverting Converter
Design Formula Table
fmin
Vin(min) Vsat
Calculation
Step–Down
Step–Up
Inverting
ton
toff
Vout + VF
Vout – VF Vin(min)
Vout + VF
Vin(min) – Vsat – Vout
Vin(min) – Vsat
(ton + toff) max
fmin
I
fmin
I
I
CT
4 x 10 5 ton
4 x 10 5 ton
4 x 10 5 ton
Ipk(switch)
2 Iout(max)
ton – toff
toff
ton + toff
toff
2 Iout(max)
2 Iout(max)
RSC
0.33
0.33
0.33
Ipk(switch)
Ipk(switch)
Ipk(switch)
L(min)
Vin(min) – Vsat – Vout
Vin(min) – Vsat
Vin(min) – Vsat
ton(max)
ton(max)
ton(max)
Ipk(switch)
Ipk(switch)
Ipk(switch)
CO
Ipk(switch) (ton + toff)Iout ton
Iout ton
8 Vripple(pp)
Vripple
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.
– 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
)
R2
R1
Vout +
1.25 R2
R1
Vin
Vout
Iout
fmin
Vripple(pp)


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