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CS51021 Datasheet(PDF) 5 Page - Cherry Semiconductor Corporation

Part No. CS51021
Description  Enhanced Current Mode PWM Controller
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Maker  CHERRY [Cherry Semiconductor Corporation]
Homepage  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS51021 Datasheet(HTML) 5 Page - Cherry Semiconductor Corporation

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Package Pin Description: continued
PACKAGE PIN #
PIN SYMBOL
FUNCTION
+
-
4.75V
VREF
DISABLE
1.33
55µA
VREF = 5V
OSC
Discharge
Latch
2.5V
PWM
Comp
S
R
Q
+
E/A
+
START
STOP
+
-
ISET
Clamp
SS
Clamp
12.5µA
OV
Monitor
UV
Monitor
+
0.1V
0.1
+
VREF
53µA
2V
VREF_OK
Vcc_OK
SS
Monitor
VFB
Monitor
+
1.45V
55ns
Blank
×
0.8
10k
20k
VREF
13.5V
VISense
2.5V
4.3V
200ns
G1
F1
G2
D1
Q2
G3
FAULT
ZD1
D4
+
4.7V
D2
D3
SS
PGnd
VC
GATE
ISENSE
SLOPE
COMP
VFB
OV
ISET
VREF
VCC
LGnd
SYNC
RTCT
UV
×
G4
×
SLEEP
2nd
Threshold
Figure 1: CS51021/22/23/24 Block Diagram
Block Diagram
16L PDIP & SO Narrow
7RTCT
Timing resistor RT and capacitor CT determine oscillator frequen-
cy and maximum duty cycle, DMAX.
8ISET
Voltage at this pin sets pulse-by-pulse overcurrent threshold, and
second threshold (1.33 times higher) with Soft Start retrigger (hic-
cup mode).
9VFB
Feedback voltage input. Connected to the error amplifier invert-
ing input.
10
COMP
Error amplifier output. Frequency compensation network is usu-
ally connected between COMP and VFB pins.
11
SS
Charging external capacitor restricts error amplifier output volt-
age during the start or fault conditions (hiccup).
12
LGnd
Logic ground.
13
VREF
5.0V reference voltage output.
14
VCC
Logic supply voltage.
15
PGnd
Output power stage ground connection.
16
VC
Output power stage supply voltage.


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