CS2844 Datasheet, PDF (3/12 Pages) Cherry Semiconductor Corporation – Current Mode PWM Control Circuit with 50% Max Duty Cycle

CS2844, CS3844, CS2845, CS3845
MAXIMUM RATINGS*
Rating
Supply Voltage (I_CC < 30 mA)
Supply Voltage (Low Impedance Source)
Output Current
Output Energy (Capacitive Load)
Analog Inputs (V_FB, Sense)
Error Amp Output Sink Current
Package Thermal Resistance, PDIP–8
Junction–to–Case, R_θJC
Junction–to–Ambient, R_θJA
Package Thermal Resistance, SO–8
Junction–to–Case, R_θJC
Junction–to–Ambient, R_θJA
Package Thermal Resistance, SO–14
Junction–to–Case, R_θJC
Junction–to–Ambient, R_θJA
Package Thermal Resistance, SO–16L
Junction–to–Case, R_θJC
Junction–to–Ambient, R_θJA
Lead Temperature Soldering:
Wave Solder (through hole styles only) (Note 1)
Reflow (SMD styles only) (Note 2)
1. 10 second maximum.
2. 60 second maximum above 183°C.
*The maximum package power dissipation must be observed.
Value
Self Limiting
30
±1.0
5.0
–0.3 to + 5.5
10
52
100
45
165
30
125
23
105
260 peak
230 peak
Unit
–
V
A
µJ
V
mA
°CW
°CW
°CW
°CW
°CW
°CW
°CW
°CW
°C
°C
ELECTRICAL CHARACTERISTICS (–25° ≤ T_A ≤ 85° for CS2844/2845, 0° ≤ T_A ≤ 70° for CS3844/CS3845.
V_CC = 15 V*; R_T = 10 kΩ, C_T = 3.3 nF for sawtooth mode; unless otherwise stated.)
CS2844/CS2845
CS3844/CS3845
Characteristic
Reference Section
Test Conditions
Min Typ Max Min Typ Max
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
T_J = 25°C, I_REF = 1.0 mA
12 ≤ V_CC ≤ 25 V
1.0 ≤ I_REF ≤ 20 mA
Note 3.
4.95 5.00 5.05 4.90 5.00 5.10
–
6.0 20
–
6.0 20
–
6.0 25
–
6.0 25
–
0.2 0.4
–
0.2 0.4
Total Output Variation
Line, Load, Temperature. Note 3.
4.90 – 5.10 4.82 – 5.18
Output Noise Voltage
Long Term Stability
Output Short Circuit
Oscillator Section
10 Hz ≤ f ≤ 10 kHz, T_J = 25°C. Note 3.
T_A = 125°C, 1000 Hrs. Note 3.
T_A = 25°C
–
50
–
–
50
–
–
5.0 25
–
5.0 25
–30 –100 –180 –30 –100 –180
Initial Accuracy
Sawtooth Mode, T_J = 25°C
47
52
57
47
52
57
Voltage Stability
12 ≤ V_CC ≤ 25 V
–
0.2 1.0
–
0.2 1.0
Temperature Stability
Sawtooth Mode T_MIN ≤ T_A ≤ T_MAX. Note 3.
–
5.0
–
–
5.0
–
Amplitude
V_OSC (peak to peak)
–
1.7
–
3. These parameters, although guaranteed, are not 100% tested in production.
*Adjust V_CC above the start threshold before setting at 15 V.
–
1.7
–
Unit
V
mV
mV
mV/°C
V
µV
mV
mA
kHz
%
%
V
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