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CS51031YD8 Arkusz danych(PDF) 4 Page - ON Semiconductor

Numer części CS51031YD8
Szczegółowy opis  Fast PFET Buck Controller
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Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS51031YD8 Arkusz danych(HTML) 4 Page - ON Semiconductor

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CS51031
http://onsemi.com
4
Q
Q
Q
Q
RG
VC
VGATE
PGND
R
S
F2
VGATE
Flip–Flop
G2
+
VFB
Comparator
A6
VFB
1.25 V
G1
0.7 V
Hold Off
Comp
Fault
Comp
1.15 V
A4
CS Charge
Sense
Comparator
R
S
F1
Slow Discharge
Flip–Flop
GND
G4
G5
+
A3
Slow Discharge
Comparator
2.3 V
2.4 V
+
A2
CS
Comparator
2.5 V
1.5 V
IT
55
IT
5
IT
CS
G3
VREF = 3.3 V
COSC
2.5 V
1.5 V
A1
VREF
3.3 V
VCCOK
VCC
Oscillator
Comparator
VCC
VREF
IC
7IC
Figure 2. Block Diagram
CIRCUIT DESCRIPTION
THEORY OF OPERATION
Control Scheme
The CS51031 monitors the output voltage to determine
when to turn on the PFET. If VFB falls below the internal
reference voltage of 1.25 V during the oscillator’s charge
cycle, the PFET is turned on and remains on for the duration
of the charge time. The PFET gets turned off and remains off
during the oscillator’s discharge time with the maximum
duty cycle to 80%. It requires 7.0 mV typical, and 20 mV
maximum ripple on the VFB pin is required to operate. This
method of control does not require any loop stability
compensation.


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