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CS5166HGDW16 Fiches technique(PDF) 11 Page - Cherry Semiconductor Corporation

No de pièce CS5166HGDW16
Description  5-Bit Synchronous CPU Controller with Power-Good and Current Limit
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Fabricant  CHERRY [Cherry Semiconductor Corporation]
Site Internet  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS5166HGDW16 Fiches technique(HTML) 11 Page - Cherry Semiconductor Corporation

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and provided that PWRGD is low. It is also required that
the overvoltage condition be present for at least the
PWRGD delay time for the OVP signal to be activated. The
resistor values shown in Figure 15 are for VDAC = +2.8V
(DAC = 10111). The VOVP (overvoltage trip-point) can be
set using the following equation:
VOVP = VBEQ3
(1+ )
Figure 13: OVP response to an input-to-output short circuit by immedi-
ately providing 0% duty cycle, crow-barring the input voltage to
ground.
Figure 14: OVP response to an input-to-output short circuit by pulling
the input voltage to ground.
Figure 15: Circuit to implement a dedicated OVP output using the
CS5166H.
Power-Good Circuit
The Power-Good pin (pin 13) is an open-collector signal
consistent with TTL DC specifications. It is externally
pulled -up, and is pulled low (below 0.3V) when the regu-
lator output voltage typically exceeds ± 8.5% of the nomi-
nal output voltage. Maximum output voltage deviation
before Power-Good is pulled low is ± 12%.
Figure 16: PWRGD signal becomes logic high as VOUT enters -8.5% of
lower PWRGD threshold, VOUT = +2.825V (DAC = 10111).
Figure 17: Power-Good response to an out of regulation condition.
Trace 1 PWRGD (2V/div)
Trace 4 VFB (1V/div)
Trace 2 - PWRGD (2V/div)
Trace 4 - VOUT (1V/div)
2.825V
+5V
+5V
VCORE
CS5166H
PWRGD
Q1
2N3906
2N3904
Q2
2N3906
Q3
R1
R2
OVP
10K
20K
10K
5K
10K
15K
56K
Trace 4 = 5V from PC Power Supply (2V/div.)
Trace 1 = Regulator Output Voltage (1V/div.)
Trace 4 = 5V from PC Power Supply (5V/div.)
Trace1 = Regulator Output Voltage (1V/div.)
Trace 2 = Inductor Switching Node (5V/div.)
R2
R1
11
Application Information: continued


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