ADP3208CJCPZ-RL View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
ADP3208CJCPZ-RL
ON Semiconductor
ADP3208CJCPZ-RL Datasheet PDF : 41 Pages
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ADP3208C
INPUT
VOLTAGE
Q1
DRVH
Q2
DRVL
SWITCH
NODE
L
OUTPUT
VOLTAGE
C
LOAD
Figure 28. Buck Topology
ON
OFF
L
C
LOAD
Figure 29. Buck Topology Inductor Current During t0 and t1
OFF
ON
L
C
LOAD
Figure 30. Buck Topology Inductor Current During t1 and t2
OFF
OFF
L
C
LOAD
Figure 31. Buck Topology Inductor Current During t2 and t3
INDUCTOR
CURRENT
SWITCH
NODE
VOLTAGE
t0 t1
t2
t3 t4
Figure 32. Inductor Current and Switch Node in DCM
4
OUTPUT VOLTAGE
20mV/DIV
SWITCH NODE 5V/DIV
2
INDUCTOR CURRENT
5A/DIV
3
1
LOW-SIDE GATE DRIVE 5V/DIV
2µs/DIV
Figure 33. Single-Phase Waveforms in DCM with 1 A Load Current
400
350
300
9V INPUT
250
19V INPUT
200
150
100
50
0
0
2
4
6
8
10
12
14
LOAD CURRENT (A)
Figure 34. Single-Phase CCM/DCM Frequency vs. Load Current
OUTPUT CROWBAR
To prevent the CPU and other external components from
damage due to overvoltage, the ADP3208C turns off the
DRVH1 and DRVH2 outputs and turns on the DRVL1 and
DRVL2 outputs when the output voltage exceeds the OVP
threshold (1.7 V typical).
Turning on the low-side MOSFETs forces the output capacitor
to discharge and the current to reverse due to current build up
in the inductors. If the output overvoltage is due to a drain-
source short of the high-side MOSFET, turning on the low-side
MOSFET results in a crowbar across the input voltage rail. The
crowbar action blows the fuse of the input rail, breaking the
circuit and thus protecting the microprocessor from
destruction.
When the OVP feature is triggered, the ADP3208C is latched
off. The latch-off function can be reset by removing and
reapplying VCC to the ADP3208C or by briefly pulling the EN
pin low.
Rev. 1 | Page 26 of 41 | www.onsemi.com
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