CS2844 Datasheet, PDF (2/6 Pages) Cherry Semiconductor Corporation – Current Mode PWM Control Circuit with 50% Max Duty Cycle

Electrical Characteristics: -25 ≤ T_A ≤ 85˚C for CS2844/2845, 0 ≤T_A ≤ 70˚C for CS3844/3845. V_CC = 15V (Note 1); R_T = 10kΩ,
C_T = 3.3nF for sawtooth mode., unless otherwise stated.
PARAMETER
s Reference Section
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short Circuit
TEST CONDITIONS
CS2844/CS2845
CS3844/CS3845
MIN TYP MAX MIN TYP MAX UNITS
T_J=25˚C, I_REF=1mA
12≤V_CC≤25V
1≤I_REF≤20mA
(Note 2)
Line, Load, Temp. (Note 2)
10Hz≤ f≤10kHz, T_J=25˚C (Note 2)
T_A=125˚C, 1000 Hrs. (Note 2)
T_A=25˚C
4.95 5.00 5.05 4.90 5.00 5.10 V
6
20
6
20 mV
6
25
6
25 mV
0.2 0.4
0.2 0.4 mV/˚C
4.90
5.10 4.82
5.18 V
50
50
µV
5
25
5
25 mV
-30 -100 -180 -30 -100 -180 mA
s Oscillator Section
Initial Accuracy
Voltage Stability
Temperature Stability
Amplitude
Sawtooth Mode, T_J=25˚C
12≤V_CC≤25V
Sawtooth Mode T_MIN≤T_A≤T_MAX
(Note 2)
V_OSC (peak to peak)
47 52 57 47 52 57 kHz
0.2 1.0
0.2 1.0 %
5
5
%
1.7
1.7
V
s Error Amp Section
Input Voltage
Input Bias Current
A_VOL
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 2)
12≤V_CC≤25V
V_FB=2.7V, V_COMP=1.1V
V_FB=2.3V, V_COMP=5V
V_FB=2.3V, R_L=15kΩ to Gnd
V_FB=2.7V, R_L=15kΩ to V_REF
2.45 2.50 2.55 2.42 2.50 2.58 V
-0.3 -1.0
-0.3 -2.0 µA
65 90
65 90
dB
0.7 1.0
0.7 1.0
MHz
60 70
60 70
dB
2
6
2
6
mA
-0.5 -0.8
-0.5 -0.8
mA
5
6
5
6
V
0.7 1.1
0.7 1.1 V
s Current Sense Section
Gain
Maximum Input Signal
PSRR
Input Bias Current
Delay to Output
(Notes 3 & 4)
V_COMP=5V (Note 3)
12≤V_CC≤25V (Note 3)
V_Sense=0V
T_J=25˚C (Note 2)
2.85 3.00 3.15 2.85 3.00 3.15 V/V
0.9 1.0 1.1 0.9 1.0 1.1 V
70
70
dB
-2 -10
-2 -10 µA
150 300
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 2)
T_J=25˚C, C_L=1nF (Note 2)
0.1 0.4
1.5 2.2
13.0 13.5
12.0 13.5
50 150
50 150
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