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CS2842A Datasheet, PDF (5/10 Pages) Cherry Semiconductor Corporation – Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout
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CS2842A, CS3842A, CS2843A, CS3843A
ELECTRICAL CHARACTERISTICS (continued) (−25° ≤ TA ≤ 85° for CS2842A/CS2843A, 0° ≤ TA ≤ 70° for CS3842A/CS3843A.
VCC = 15 V*; RT = 680 Ω, CT = 0.022 μF for triangular mode, RT = 10 kΩ, CT = 3.3 nF for sawtooth mode (see Figure 7);
unless otherwise stated.)
CS2842A
CS3842A
CS2843A/CS3843A
Characteristic
Test Conditions
Undervoltage Lockout Section
Start Threshold
−
Min Typ Max Min Typ Max Min Typ Max Unit
15
16
17 14.5 16 17.5 7.8 8.4 9.0
V
Min. Operating Voltage After Turn On
9.0 10
11 8.5 10 11.5 7.0 7.6 8.2
V
*Adjust VCC above the start threshold before setting at 15 V.
PACKAGE PIN DESCRIPTION
Package Pin Number
DIP−8
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 3
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 4
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 5
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ −
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 6
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ −
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 7
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 8
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ −
SO−8
1
2
3
4
5
−
6
−
7
8
−
SO−14
1
3
5
7
8
9
10
11
12
14
2, 4, 6, 13
Symbol
COMP
VFB
Sense
OSC
GND
Pwr GND
VOUT
VCC Pwr
VCC
VREF
NC
Description
Error amp output, used to compensate error amplifier.
Error amp inverting input.
Noninverting input to Current Sense Comparator.
Oscillator timing network with capacitor to ground, resistor to VREF.
Ground.
Output driver ground.
Output drive pin.
Output driver positive supply.
Positive power supply.
Output of 5.0 V internal reference.
No connection.
TYPICAL PERFORMANCE CHARACTERISTICS
900
800
RT = 680 Ω
700
600
500 RT = 1.5 kΩ
400
300
200
RT = 10 kΩ
100
.0005
.001 .002 .003 .005 .01
CT (μF)
.02 .03 .04 .05
Figure 2. Oscillator Frequency vs. CT
100
90
80
70
60
50
40
30
20
10
RT (Ω)
Figure 3. Oscillator Duty Cycle vs. RT
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