CS51021/22/23/24
Electrical Characteristics: Unless otherwise stated, specifications apply for -40°C < T
A
< 85°C, -40°C < T
J
< 150°C,
3V < V
C
< 20V, 8.2V < V
CC
< 20V, R
T
= 12kΩ, C
T
= 390pF.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s
SLOPE Compensation
Charge Current
COMP Gain
Discharge Voltage
s
Current Sense
OFFSET Voltage
Blanking Time
Blanking Disable Voltage
Second Current Threshold Gain
I
SENSE
Input Resistance
Minimum On Time
Gain
s
OV & UV Voltage Monitors
OV Monitor Threshold
OV Hysteresis Current
UV Monitor Threshold
UV Monitor Hysteresis
s
SOFT START (SS)
Charge Current
Discharge Current
Charge Voltage, V
SS
Discharge Voltage, V
SS
Note 1: Guaranteed by Design, not 100% tested in production.
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
SLOPE = 2V
Fraction of slope voltage added
to I
SENSE
(Note 1)
SYNC = 0V
-63
0.095
-53
0.100
0.1
-43
0.105
0.2
µA
V/V
V
(Note 1)
Adjust V
FB
0.09
1.8
1.21
0.10
55
2
1.33
5
70
0.80
0.11
160
2.2
1.45
110
0.82
V
ns
V
V/V
kΩ
ns
V/V
GATE High to Low
(Note 1)
30
0.78
2.4
-10
1.38
25
2.5
-12.5
1.45
75
2.6
-15
1.52
100
V
µA
V
mV
SS = 2V
SS = 2V
-70
250
4.4
0.25
-55
1000
4.7
0.27
-40
5
0.30
µA
µA
V
V
16L PDIP & SO Narrow
1
2
3
3
GATE
I
SENSE
SYNC
(CS51021/23)
SLEEP
(CS51022/24)
SLOPE
UV
OV
External power switch driver with 1.0A peak capability.
Current sense amplifier input.
Bi-directional synchronization. Locks to the highest frequency.
Active high chip disable. In sleep mode, V
REF
and GATE are
turned off.
Additional slope to the current sense signal. Internal current
source charges the external capacitor.
Undervoltage protection monitor.
Overvoltage protection monitor.
4
5
6
4
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
