cs51221 ON Semiconductor, cs51221 Datasheet - Page 7

• Manufacturer Part Number: cs51221
• Description: Enhanced Voltage Mode Pwm Controller
• Manufacturer: ON Semiconductor

I
COMP
SYNC
SENSE
R
V
I
T
V
SET
CC
C
FF
FB
T
(1.263 V)
V
BG
2.0 V to 1.0 V Trip Points
+
−
DISABLE
+
−
EAMP
UV Lockout
Start/Stop
+
−
3.0 V
UVL
150 ns
Blank
Soft−Start Clamp
ENABLE
−
+
FF Discharge
SS to 1.8 V Max
OSC
Max Duty Cycle
(Sat Sense)
G3
V
+
−
REF
I
+
−
LIM
= 3.3 V
Figure 2. Block Diagram
http://onsemi.com
3.1 V
(Sat Sense)
CS51221
Max SS
7
Det
3.3 V
+
−
−
+
Comp
PWM
−
+
G2
3.0 V
V
REF
S
R
OK
OV Monitor
G4
Q
Q
Shutdown
Thermal
UV Monitor
2.0 mA (maximum load current)
Discharge
Latching
+
−
G1
V
−
+
O
2.0 V
50 mA
Off
Low Sat
Gate Driver
13.5 V
5.0 mA
ON
1.0 V
V
REF
V
V
GATE
PGND
LGND
SS
OV
UV
REF
C