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CS3842AGN8 Datenblatt(PDF) 5 Page - ON Semiconductor

Teilenummer CS3842AGN8
Bauteilbeschribung  Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout
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Hersteller  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS3842AGN8 Datenblatt(HTML) 5 Page - ON Semiconductor

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CS2842A, CS3842A, CS2843A, CS3843A
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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.)
Characteristic
Test Conditions
CS2842A
CS3842A
CS2843A/CS3843A
Unit
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Undervoltage Lockout Section
Start Threshold
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
Symbol
Description
DIP−8
SO−8
SO−14
1
1
1
COMP
Error amp output, used to compensate error amplifier.
2
2
3
VFB
Error amp inverting input.
3
3
5
Sense
Noninverting input to Current Sense Comparator.
4
4
7
OSC
Oscillator timing network with capacitor to ground, resistor to VREF.
5
5
8
GND
Ground.
9
Pwr GND
Output driver ground.
6
6
10
VOUT
Output drive pin.
11
VCC Pwr
Output driver positive supply.
7
7
12
VCC
Positive power supply.
8
8
14
VREF
Output of 5.0 V internal reference.
2, 4, 6, 13
NC
No connection.
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 2. Oscillator Frequency vs. CT
Figure 3. Oscillator Duty Cycle vs. RT
900
800
700
600
500
.0005
.001
.002
.04 .05
CT (μF)
400
300
200
100
.03
.02
.01
.003 .005
RT = 680 Ω
RT = 1.5 kΩ
RT = 10 kΩ
100
90
80
70
50
RT (Ω)
40
30
20
10
60


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