amc7660 ADDtek Corp, amc7660 Datasheet - Page 9

• Manufacturer Part Number: amc7660
• Description: Converter Control Circuit
• Manufacturer: ADDtek Corp

Typical Design Reference Table:
V
V
The following power supply characteristics must be chosen:
Application concerns:
Copyright © 2006 ADDtek Corp.
F
sat
:
:
Calculation
I
Forward Voltage drop of the output rectifier
Saturation voltage of the output switch.
V
V
I
f
V
To get the best regulation performance, Low ESR capacitors at Vout are suggested.
t
pk(switch)
on
out
min
t
L
on
in
out
ripple(pp)
R
C
C
t
t
(min)
+ t
off
on
/t
- Nominal input voltage
SC
– Minimum desired output switching frequency at the selected values of V
O
T
- Desired output voltage, ?V
off
- Desired output current.
off
– Desired peak – to – peak output ripple voltage.
(
(V
in(min)
V
I
pk(switch)
in(min)
I
(t
4.0 × 10
pk(switch)
Step-Down
0.3/I
− V
on
8V
t
V
2I
on
t
+ t
on
out
− V
/t
sat
out(max)
ripple(pp)
pk(switch)
off
( t
+ t
1
off
f
+ V
− V
out
) − t
sat
+ 1
on
off
-5
? = 1.25(1 + R1/R2)
− V
F
+ t
out
t
on
off
)
off
out
)
)
t
on(max)
(
9
(V
2I
V
in(min)
I
out(max)
pk(switch)
out
(t
4.0 × 10
9
V
0.3/I
on
Step-Up
+ V
in(min)
t
V
on
− V
t
+ t
on
I
ripple(pp)
/t
out
pk(switch)
F
(t
+ t
off
1
off
f
sat
on
− V
− V
t
) − t
on
+ 1
off
)
-5
/t
)
off
in(min)
sat
t
on
off
+ 1)
t
on(max)
in
(
and I
(V
in(min)
O
I
Voltage-Inverting
2I
pk(switch)
out(max)
9
DD057_C -- JUNE 2006
(t
4.0 × 10
− V
0.3/I
?V
on
V
t
V
I
on
AMC7660
t
ripple(pp)
out
+ t
on
out
in
sat
/t
− V
pk(switch)
(t
off
+ t
? + V
1
off
t
)
f
on
on
) − t
)
+ 1
off
-5
/t
sat
off
t
t
on(max)
F
on
off
+ 1)