CS2842A Datasheet, PDF (3/10 Pages) Cherry Semiconductor Corporation – Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout

CS2842A, CS3842A, CS2843A, CS3843A
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
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
260 peak
230 peak
Unit
−
V
A
μJ
V
mA
°CW
°CW
°CW
°CW
°CW
°CW
°C
°C
ELECTRICAL CHARACTERISTICS (−25° ≤ T_A ≤ 85° for CS2842A/CS2843A, 0° ≤ T_A ≤ 70° for CS3842A/CS3843A.
V_CC = 15 V*; R_T = 680 Ω, C_T = 0.022 μF for triangular mode, R_T = 10 kΩ, C_T = 3.3 nF for sawtooth mode (see Figure 7);
unless otherwise stated.)
CS2842A/CS2843A CS3842A/CS3843A
Characteristic
Reference Section
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Test Conditions
T_J = 25°C, I_OUT = 1.0 mA
12 ≤ V_IN ≤ 25 V
1.0 ≤ I_OUT ≤ 20 mA
Note 3.
Min Typ Max Min Typ Max
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
Initial Accuracy
Voltage Stability
Temperature Stability
10 Hz ≤ f ≤ 10 kHz, T_J = 25°C (Note 3.)
T_A = 125°C, 1.0 kHrs. (Note 3.)
T_A = 25°C
−
50
−
−
50
−
−
5.0 25
−
5.0 25
−30 −100 −180 −30 −100 −180
Sawtooth Mode (see Figure 7), T_J = 25°C
47
52
57
47
52
57
Triangular Mode (see Figure 7), T_J = 25°C
47
52
57
44
52
60
12 ≤ V_CC ≤ 25 V
−
0.2 1.0
−
0.2 1.0
Sawtooth Mode T_MIN ≤ T_A ≤ T_MAX (Note 3.)
−
5.0
−
Triangular Mode T_MIN ≤ T_A ≤ T_MAX (Note 3.) −
8.0
−
−
5.0
−
−
8.0
−
Amplitude
OSC peak to peak
−
1.7
−
−
1.7
−
Discharge Current
T_J = 25°C
T_MIN ≤ T_A ≤ T_MAX
7.5 8.3 9.3 7.5 8.3 9.3
7.2
−
9.5 7.2
−
9.5
3. These parameters, although guaranteed, are not 100% tested in production.
*Adjust V_CC above the start threshold before setting at 15 V.
Unit
V
mV
mV
mV/°C
V
μV
mV
mA
kHz
kHz
%
%
%
V
mA
mA
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