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CS3845B Datasheet(PDF) 2 Page - ON Semiconductor

Part # CS3845B
Description  Current Mode PWM Control Circuit
PDF  8 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS3845B Datasheet(HTML) 2 Page - ON Semiconductor

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2
Electrical Characteristics: 0
≤T
A≤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
≤ V
CC ≤ 25V
6
20
mV
Load Regulation
1
≤ I
REF ≤ 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, T
J = 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
47
52
57
kHz
Voltage Stability
12
≤ V
CC ≤ 25V
0.2
1.0
%
Temperature Stability
Sawtooth Mode TMIN ≤ TA ≤ TMAX
(Note 1)
5
%
Amplitude
VOSC (peak to peak)(Note 1)
1.7
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
≤ V
OUT ≤ 4V
65
90
dB
Unity Gain Bandwidth
(Note 1)
0.7
1.0
MHz
PSRR
12
≤ V
CC ≤ 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
≤ V
CC ≤ 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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