SC2447 Semtech Corporation, SC2447 Datasheet - Page 7

• Manufacturer Part Number: SC2447
• Description: Dual-Phase Single or Two Output Synchronous Step-Down Controller
• Manufacturer: Semtech Corporation

Circuit Conditions: 2-Output Configuration as in Figure 16. V
Typical Application Circuit Performance
POWER MANAGEMENT
© 2006 Semtech Corp.
20mV/div
0.5V/div
V
V
10A/div
10A/div
10V/div
20A/div
1V/div
2V/div
2V/div
SS1/EN1
SS2/EN2
V
V
V
V
I
I
I
OUT1
OUT1
OUT1
OUT1
OUT2
OUT2
SW1
I
OUT1
Output Voltage Ripple (V
=20A
Soft-Start Up (V
Soft-Start Up (V
10ms/div
10ms/div
2µs/DIV
OUT1
OUT2
)
)
OUT1
)
0.1V/div
V
0.5V/div
V
20A/div
1V/div
2V/div
SS1/EN1
5A/div
SS2/EN2
2V/div
V
V
V
I
OUT1
OUT1
OUT1
I
OUT2
OUT2
IN
I
= 12V, V
I
OUT1
OUT1
I
OUT2
Load Transient Response (V
=15A to 20A
=0A
=0A
Pre-biased Start Up (V
Pre-biased Start Up (V
OUT1
= 2.5V, V
200µs/div
10ms/div
10ms/div
7
OUT2
= 1.2V, R
OUT1
OUT2
)
OUT1
)
OSC
)
= 51.1kΩ, SYNC = 0, and T
0.5V/div
V
V
20A/div
V
1V/div
2A/div
SS1/EN1
5V/div
5V/div
1V/div
SS1/EN1
2V/div
1A/div
SS2/EN2
5V/div
5V/div
V
V
V
V
V
I
I
I
OUT1
OUT1
GDL1
OUT1
OUT2
OUT2
GDL2
OUT1
R
R
OUT1
OUT2
=1Ω
=1Ω
Overload Hiccup (V
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Shutdown (V
Shutdown (V
A
= 25°C.
200µs/div
200µs/div
50ms/div
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SC2447
OUT1
OUT2
)
)
OUT1
)