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CS51221 Datasheet(PDF) 6 Page - Cherry Semiconductor Corporation

Part # CS51221
Description  Enhanced Voltage Mode PWM Controller
PDF  12 Pages
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Manufacturer  CHERRY [Cherry Semiconductor Corporation]
Direct Link  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS51221 Datasheet(HTML) 6 Page - Cherry Semiconductor Corporation

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Typical Performance Characteristics
6
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
Block Diagram
3.1V
VREF
DISABLE
FF Discharge
50µA
VREF = 3.3V
OSC
S
R
Q
150ns
Blank
13.5V
SS
PGnd
VC
GATE
ISENSE
COMP
VFB
I
SET
VREF
VCC
SYNC
RTCT
OV
ENABLE
VBG
FF
Latching
Discharge
1V
UV Monitor
2V
UVL
2mA(maximum load current)
Low
Sat
Gate
Driver
Thermal
Shutdown
+
-
EAMP
ILIM
G
3
G4
OV Monitor
Max SS
Det
(Sat Sense)
3.0V
UV
PWM
Comp
VREF OK
UV Lockout
Start/Stop
G1
3.3V
VO Off
5µA
SS to 1.8V Max
(Sat Sense)
Max Duty Cycle
3.0V
LGnd
2V to 1V Trip Points
Q
(1.263V)
Soft Start Clamp
ON
G2
16L PDIP & 16L SO Narrow
1
GATE
External power switch driver with 1.0A peak capability. Rail to
rail output occurs when the capacitive load is between 470pF
and 10nF.
2ISENSE
Current sense comparator input.
3
SYNC
Bidirectional synchronization. Locks to highest frequency.
4
FF
PWM ramp.
5
UV
Undervoltage protection monitor.
6
OV
Overvoltage protection monitor.
7RT/CT
Timing resistor RT and capacitor CT determine oscillator
frequency and maximum duty cycle, DMAX.
8ISET
Voltage at this pin sets pulse-by-pulse overcurrent threshold.
9VFB
Feedback voltage input. Connected to the error amplifier
inverting input.
10
COMP
Error amplifier output.
11
SS
Charging external capacitor restricts error amplifier output
voltage during the power up or fault conditions.
12
LGnd
Logic Ground.
13
VREF
3.3V reference voltage output. Decoupling capacitor can be
selected from 0.01µF to 10µF.
14
VCC
Logic supply voltage.
15
PGnd
Output power stage ground.
16
VC
Output power stage supply voltage.



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