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CS51021 Datasheet(PDF) 3 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) 3 Page - Cherry Semiconductor Corporation

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3
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Electrical Characteristics: -40°C < TA < 85°C, -40°C < TJ < 150°C, 3V < VC < 20V, 8.2V < VCC < 20V,
RT = 12kΩ, CT = 390pF, unless otherwise stated
s
Error Amplifier continued
COMP High Voltage
VFB = 2.3V
4.35
4.8
5
V
COMP Low Voltage
VFB = 2.7V
0.4
0.8
1.2
V
PS Ripple Rejection
FREQ = 120Hz (Note 1)
60
85
dB
SS Clamp, VCOMP
VSS=2.5V, VFB = 0V, ISET = 2V
2.4
2.5
2.6
V
ILIM(SET) Clamp
(Note 1)
0.95
1
1.15
V
s
Oscillator
Accuracy
RT = 12k, CT = 390pF
230
255
280
kHz
Voltage Stability
Delta Frequency 8.2V < VCC < 20V
2
3
%
Temperature Stability
TMIN < TA < TMAX (Note1)
8
%
Min Charge & Discharge Time
(Note1)
0.333
µs
Duty Cycle Accuracy
RT = 12k, CT = 390pF
70
77
83
%
Peak Voltage
(Note 1)
3
V
Valley Voltage
(Note 1)
1.5
V
Valley Clamp Voltage
10k Resistor to ground on RTCT
1.2
1.4
1.6
V
Discharge Current
0.8
1
1.2
mA
Discharge Current
TA=25°C (Note 1)
0.925
1
1.075
mA
s
Synchronization (CS51021/23)
Input Threshold
1.0
1.5
2.7
V
Output Pulsewidth
160
260
360
ns
Output High Voltage
ISYNC = 100µA
3.5
4.3
4.8
V
Input Resistance
(Note 1)
35
70
140
kΩ
Drive Delay
SYNC to GATE RESET
80
120
150
ns
Output Drive Current
1k Load
1.25
2
3.5
mA
s
SLEEP (CS51022/24)
SLEEP Input Threshold
Active High
1.0
1.5
2.7
V
SLEEP Input Current
VSLEEP = 4V
11
25
46
µA
ICC @ SLEEP
VCC ≤ 15V
50
100
µA
s
GATE Driver
HIGH Voltage
Measure VC-GATE, VC = 10V, 150mA Load
1.5
2.2
V
LOW Voltage
Measure GATE-PGnd, 150mA SINK
1.2
1.5
V
HIGH Voltage Clamp
VC = 20V, 1nF
11
13.5
16
V
LOW Voltage Clamp
Measured at 10mA Output Current
0.6
0.8
V
Peak Current
VC = 20V, 1nF (Note 1)
1
A
UVL Leakage
VC = 20V, measured at 0V
-1
-50
µA
RISE Time
Load = 1nF, 1V < GATE < 9V,
60
100
ns
VC = 20V, TA = 25˚C
FALL Time
Load = 1nF, 9V > GATE > 1V, VC = 20V
15
40
ns


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