CS3843A datasheet(5/10 Pages) ONSEMI

部件名	CS3843A

功能描述	Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout

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制造商	ONSEMI [ON Semiconductor]

网页	http://www.onsemi.com

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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

COMP

Error amp output, used to compensate error amplifier.

2

3

VFB

Error amp inverting input.

3

5

Sense

Noninverting input to Current Sense Comparator.

4

7

OSC

Oscillator timing network with capacitor to ground, resistor to VREF.

5

8

GND

Ground.

−

9

Pwr GND

Output driver ground.

6

10

VOUT

Output drive pin.

−

11

VCC Pwr

Output driver positive supply.

7

12

VCC

Positive power supply.

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

类似零件编号 - CS3843A

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类似说明 - CS3843A

制造商	部件名	数据表	功能描述
Cherry Semiconductor Co...	CS2842A	156Kb / 6P	Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout
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