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CS3845B Datasheet(PDF) 2 Page - Cherry Semiconductor Corporation

Part # CS3845B
Description  Current Mode PWM Control Circuit with 50% Max Duty Cycle
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Manufacturer  CHERRY [Cherry Semiconductor Corporation]
Direct Link  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS3845B Datasheet(HTML) 2 Page - Cherry Semiconductor Corporation

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Electrical Characteristics: 0≤TA≤70˚C, VCC=15V; RT=10kΩ, CT=3.3nF for sawtooth mode, unless otherwise stated
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
s
Reference Section
Output Voltage
TJ=25˚C, IREF=1mA
4.90
5.00
5.10
V
Line Regulation
12≤VCC≤25V
6
20
mV
Load Regulation
1≤IREF≤20mA
6
25
mV
Temperature Stability
(Note 1)
0.2
0.4
mV/˚C
Total Output Variation
Line, Load, Temp. (Note 1)
4.82
5.18
V
Output Noise Voltage
10Hz≤f≤10kHz, TJ=25˚C (Note 1)
50
µV
Long Term Stability
TA=125˚C, 1000 Hrs. (Note 1)
5
25
mV
Output Short Circuit
TA=25˚C
-30
-100
-180
mA
s
Oscillator Section
Initial Accuracy
Sawtooth Mode, TJ=25˚C
475257
kHz
Voltage Stability
12≤VCC≤25V
0.2
1.0
%
Temperature Stability
Sawtooth Mode TMIN≤TA≤TMAX
(Note 1)
5
%
Amplitude
VOSC (peak to peak)(Note 1)
17
V
Discharge
TJ=25°C; (Note 1)
7.5
8.3
9.3
mA
TMIN≤TA≤TMAX (Note 1)
7.2
9.5
mA
s
Error Amp Section
Input Voltage
VCOMP=2.5V
2.42
2.50
2.58
V
Input Bias Current
VFB=0V
-0.3
-2.0
µA
AVOL
2≤VOUT≤4V
65
90
dB
Unity Gain Bandwidth
(Note 1)
0.7
1.0
MHz
PSRR
12≤VCC≤25V
60
70
dB
Output Sink Current
VFB=2.7V, VCOMP=1.1V
2
6
mA
Output Source Current
VFB=2.3V, VCOMP=5V
-0.5
-0.8
mA
VOUT HIGH
VFB=2.3V, RL15kΩ to Gnd
5
6
V
VOUT LOW
VFB=2.7V, RL=15kΩ to VREF
0.7
1.1
V
s
Current Sense Section
Gain
(Notes 2&3)
2.85
3.00
3.15
V/V
Maximum Input Signal
VCOMP=5V (Note 2)
0.9
1.0
1.1
V
PSRR
12≤VCC≤25V (Note 2)
70
dB
Input Bias Current
VSense=0V
-2
-10
µA
Delay to Output
TJ=25˚C (Note 1)
150
300
ns
s
Output Section
Output Low Level
ISINK=20mA
0.1
0.4
V
ISINK=200mA
1.5
2.2
V
Output High Level
ISOURCE=20mA
13.0
13.5
V
ISOURCE=200mA
12.0
13.5
V
Rise Time
TJ=25˚C, CL=1nF (Note 1)
50
150
ns
Fall Time
TJ=25˚C, CL=1nF (Note 1)
50
150
ns


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