CS3845GDR8 datasheet(5/12 Pages) ONSEMI

부품명	CS3845GDR8

상세설명	Current Mode PWM Control Circuit

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ELECTRICAL CHARACTERISTICS (continued) (–25

° ≤ TA ≤ 85° for CS2844/2845, 0° ≤ TA ≤ 70° for CS3844/CS3845.

VCC = 15 V*; RT = 10 kΩ, CT = 3.3 nF for sawtooth mode; unless otherwise stated.)

CS2844

CS3844

CS2845/CS3845

Characteristic

Test Conditions

Min

Typ

Max

Min

Typ

Max

Min

Typ

Max

Unit

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

DIP–8 & SO–8

SO–14

Symbol

Description

1

3

COMP

Error amp output, used to compensate error amplifier.

2

3

4

VFB

Error amp inverting input.

3

5

Sense

Noninverting input to Current Sense Comparator.

4

7

6

OSC

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

5

9

11

GND

Ground.

–

8

10

Pwr GND

Output driver ground.

6

10

12

VOUT

Output drive pin.

–

11

13

VCC Pwr

Output driver positive supply.

7

12

14

VCC

Positive power supply.

8

14

15

VREF

Output of 5.0 V internal reference.

–

2, 4, 6, 13

1, 2, 7, 8,

9, 16

NC

No connection.

Figure 2. Test Circuit Open Loop Laboratory Test Fixture

VREF

VCC

VOUT

GND

COMP

VFB

Sense

OSC

0.1

µF

0.1

µF

RT

1.0 k

Ω

1.0 W

2N2222

100 k

Ω

VCC

VREF

VOUT

GND

A

5.0 k

Ω

Sense

ADJUST

CT

4.7 k

Ω

4.7 k

Ω

1.0 k

Ω

ERROR AMP

ADJUST

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