SC2620 Semtech Corporation, SC2620 Datasheet - Page 24

• Manufacturer Part Number: SC2620
• Description: 30V Step-down Regulator
• Manufacturer: Semtech Corporation

POWER MANAGEMENT
Typical Application Circuits
Figure 17(a).
2008 Semtech Corp.
Figure 17(b). V
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CH1 : V
CH2 : OUT1 Voltage, 2V/div
CH3 : OUT2 Voltage, 0.5V/div
CH4 : SS2 Voltage, 2V/div
FB voltage. R
500kHz 12V to 5V and 0.8V step-down converter. Notice that V
IN
Start-up Transient (I
IN
, 5V/div
15.4k
8.25k
4ms/div
47nF
C10
22nF
C7
R5
R7
22pF
47pF
C6
C9
51.1k
R9
11
1nF
1nF
C5
C8
and R
SS1
ROSC
PGOOD1
SS2
COMP2
FB2
COMP1
SC2620
12
OUT1
GND
FB1
constitute the feedback voltage divider for Channel 2.
BOOST1
BOOST2
C H 1
C H 2
C H 3
C H 4
= I
PVIN
SW1
SW2
VIN
OUT2
L1 : Coiltronics DR74
L2 : Coiltronics DR73
= 1.5A).
1N4148
D4
12V
10
R10
0.1 F
C16
10 F
C15
24
0.1 F
0.1 F
C2
C4
C1: Murata GRM21BR60J 226M
C3: Murata GRM31CR60J476M
C15: Murata GRM32DR61E106K
Figure 17(c). Channel 2 Output Short-circuit Hiccup.
D1
UPS120
D2
UPS120
1N4148
15 H
D3
L1
4.7 H
L2
Upper Trace : OUT2 Voltage, 0.1V/div
Lower Trace : I
Middle Trace : SS2 Voltage, 1V/div
22 F
C1
47 F
C3
60.4k
15.0k
R1
R2
R3
8.06k
OUT2
C11
47pF
47pF
C12
10ms/div
is lower than the nominal
L2
, 2A/div
R12
R11
80.6k
4.02k
OUT2
OUT1
0.8V/2A
5V/2A
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SC2620