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SC284P Datasheet(PDF) 19 Page - Semtech Corporation

Part # SC284P
Description  Dual Channel 2.5MHz, 2.0A Synchronous Buck with Automatic Power Save
PDF  22 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC284P Datasheet(HTML) 19 Page - Semtech Corporation

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9
SC284P
Applications Information (continued)
Figure 6 — Soft Start Operation
Figure 5 — Current Limit Protection
J
M
K
L
Stages
Operation description
0
Chip is OFF.
1
Peak current limit at 20% level
PWM "ON" when inductor current of 0A
PWM "OFF" when inductor current hits peak current limit
Stage duration of 400µs
2
Peak current limit at 25% level
PWM "ON" when inductor current of 0A
PWM "OFF" when inductor current hits peak current limit
Stage duration of 400µs
3
Peak current limit at 40% level
PWM "ON" when inductor current of 500mA
PWM "OFF" when inductor current hits peak current limit
Stage duration of 400µs
4
Peak current limit at 100% level
PWM "ON" when inductor current of 500mA
PWM "OFF" when inductor current hits peak current limit
Stage duration of 400µs
5
Peak current limit at 100% level
Switch to closed-loop PWM operation.
6
Soft Start ends.
Normal PWM operation
Overload protection is enabled
Conditions
Operation description
A
VIN > UVLO Threshold
AND
One or more CTL pin is high.
AND
Internal reference is ready.
B
End of stage 1 AND Vout<86% of target
C
End of stage 2 AND Vout<86% of target
D
End of stage 3 AND Vout<86% of target
E
End of stage 4 AND Vout<86% of target
F
Vout>86% of target
G
Vout>86% of target
H
Vout>86% of target
I
End of soft start time of 1700µs
Stages
Operation description
6
Normal PWM operation
Overload protection is enabled and peak current limit at 100% level
7
Cycle by cycle peak current limit
8
OCP protection is activated.
Foldback peak current limit.
PWM "ON" when inductor current of 0A
PWM "OFF" when inductor current hits peak current limit of foldback
mode.
Conditions
Operation description
J
Inductor current hits peak current limit
K
Peak current limit for 16 consecutive cycles
L
Vout ≥ 100% target
M
Inductor current doesn't hit peak current limit



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