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CS5161 Datasheet(PDF) 11 Page - ON Semiconductor

Part No. CS5161
Description  CPU 5−Bit Synchronous Buck Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5161 Datasheet(HTML) 11 Page - ON Semiconductor

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CS5161, CS5161H
http://onsemi.com
11
latch. This causes the top MOSFET to shut off,
disconnecting the regulator from it’s input voltage. The Soft
Start capacitor is then slowly discharged by a 2.0 μA current
source until it reaches it’s lower 0.7 V threshold. The
regulator will then attempt to restart normally, operating in
it’s extended off time mode with a 50% duty cycle, while the
Soft Start capacitor is charged with a 60 μA charge current.
If the short circuit condition persists, the regulator output
will not achieve the 1.0 V low VFFB comparator threshold
before the Soft Start capacitor is charged to it’s upper 2.5 V
threshold. If this happens the cycle will repeat itself until the
short is removed. The Soft Start charge/discharge current
ratio
sets
the
duty
cycle
for
the
pulses
(2.0 μA/60 μA = 3.3%), while actual duty cycle is half that
due to the extended off time mode (1.65%).
This protection feature results in less stress to the
regulator components, input power supply, and PC board
traces than occurs with constant current limit protection (see
Figures 12 and 13).
If the short circuit condition is removed, output voltage
will rise above the 1.0 V level, preventing the FAULT latch
from being set, allowing normal operation to resume.
Figure 12. CS5161/5161H Hiccup Mode Short Circuit
Protection. Gate Pulses are Delivered While the Soft
Start Capacitor Charges, and Cease During Discharge
M 25.0 ms
Trace 3− Soft Start Timing Capacitor (1.0 V/div.)
Trace 4− 5.0 V Supply Voltage (2.0 V/div.)
Trace 2− Inductor Switching Node (2.0 V/div.)
Figure 13. CS5161/5161H Startup with Regulator
Output Shorted
M 50.0 μs
Trace 4− 5.0 V from PC Power Supply (2.0 V/div.)
Trace 2− Inductor Switching Node (2.0 V/div.)
Overvoltage Protection
Overvoltage protection (OVP) is provided as result of the
normal operation of the V2 control topology and requires no
additional external components. The control loop responds
to an overvoltage condition within 100 ns, causing the top
MOSFET to shut off, disconnecting the regulator from it’s
input voltage. The bottom MOSFET is then activated,
resulting in a “crowbar” action to clamp the output voltage
and prevent damage to the load (see Figures 14 and 15). The
regulator will remain in this state until the overvoltage
condition ceases or the input voltage is pulled low. The
bottom FET and board trace must be properly designed to
implement the OVP function.
Figure 14. CS5161/5161H OVP Response to an
Input−to−Output Short Circuit by Immediately
Providing 0% Duty Cycle, Crow−Barring the Input
Voltage to Ground
M 10.0 μs
Trace 1− Regulator Output Voltage (1.0 V/div.)
Trace 2− Inductor Switching Node 5.0 V/div.)
Trace 4− 5.0 V from PC Power Supply (5.0 V/div.)


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