CS51021A, CS51022A, CS51023A, CS51024A
VCC
LGND
SLEEP
SYNC
RTCT
−+
COMP
+
2.5 V −
VFB
VREF
53 mA
SLOPE
ISENSE
Q2
ISET
OV
+
Start
Stop
−
VCC_OK
VREF = 5.0 V
4.3 V
200 ns
OSC
+
4.75 V
−
−
VREF_OK
+
+
SS
Clamp
−
+
E/A
−
−
D2
ISET
Clamp
+
D3
20 k
D1
10 k
−
VFB
Monitor
+
+
G4
− 2.0 V
0.1
Σ
0.1 V
−+
DISABLE
55 ns
Blank
0.8
VREF
12.5 mA
+
− 2.5 V
1.33
+
OV
Monitor
−
G1
−
PWM
Comp
+
−
SS
Monitor
+
VISENSE
+
2nd
Threshold
−
VREF
VC
SQ
F1
G2
D4
R
GATE
ZD1
13.5 V
PGND
VREF
55 mA
SS
+
− 4.7 V
G3
Discharge
FAULT
Latch
−
UV
UV
Monitor
+
+
1.45 V −
Figure 2. Block Diagram
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