CS3845B Datasheet, PDF (2/8 Pages) Cherry Semiconductor Corporation – Current Mode PWM Control Circuit with 50% Max Duty Cycle

Electrical Characteristics: 0≤T_A≤70°C, V_CC=15V; R_T=10kΩ, C_T=3.3nF for sawtooth mode, unless otherwise stated
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNITS
s Reference Section
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short Circuit
T_J = 25°C, I_REF=1mA
4.90
12 ≤ V_CC ≤ 25V
1 ≤ I_REF ≤ 20mA
(Note 1)
Line, Load, Temp. (Note 1)
4.82
10Hz ≤ f ≤ 10kHz, T_J = 25°C (Note 1)
T_A = 125°C, 1000 Hrs. (Note 1)
T_A = 25°C
–30
5.00
6
6
0.2
50
5
–100
5.10
20
25
0.4
5.18
25
–180
V
mV
mV
mV/°C
V
µV
mV
mA
s Oscillator Section
Initial Accuracy
Sawtooth Mode, T_J = 25°C
47
52
57
kHz
Voltage Stability
12 ≤ V_CC ≤ 25V
0.2
1.0
%
Temperature Stability
Sawtooth Mode T_MIN ≤ T_A ≤ T_MAX
(Note 1)
5
%
Amplitude
V_OSC (peak to peak)(Note 1)
1.7
V
Discharge
T_J = 25°C; (Note 1)
T_MIN ≤ T_A ≤ T_MAX (Note 1)
7.5
8.3
9.3
mA
7.2
9.5
mA
s Error Amp Section
Input Voltage
Input Bias Current
AVOL
Unity Gain Bandwidth
PSRR
Output Sink Current
Output Source Current
V_OUT HIGH
V_OUT LOW
V_COMP = 2.5V
V_FB = 0V
2 ≤ V_OUT ≤ 4V
(Note 1)
12 ≤ V_CC ≤ 25V
V_FB = 2.7V, V_COMP = 1.1V
V_FB = 2.3V, V_COMP = 5V
V_FB = 2.3V, R_L15kΩ to Gnd
V_FB = 2.7V, R_L = 15kΩ to V_REF
2.42
2.50
2.58
V
–0.3
–2.0
µA
65
90
dB
0.7
1.0
MHz
60
70
dB
2
6
mA
–0.5
–0.8
mA
5
6
V
0.7
1.1
V
s Current Sense Section
Gain
Maximum Input Signal
PSRR
Input Bias Current
Delay to Output
(Notes 2&3)
V_COMP = 5V (Note 2)
12 ≤ V_CC ≤ 25V (Note 2)
V_Sense = 0V
T_J = 25°C (Note 1)
2.85
3.00
3.15
V/V
0.9
1.0
1.1
V
70
dB
–2
–10
µA
150
300
ns
s Output Section
Output Low Level
Output High Level
Rise Time
Fall Time
I_SINK = 20mA
I_SINK = 200mA
I_SOURCE = 20mA
I_SOURCE = 200mA
T_J = 25°C, C_L = 1nF (Note 1)
T_J = 25°C, C_L = 1nF (Note 1)
0.1
0.4
V
1.5
2.2
V
13.0
13.5
V
12.0
13.5
V
50
150
ns
50
150
ns
2