CS2844 datasheet(5/12 Pages) ONSEMI

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CS2844, CS3844, CS2845, CS3845

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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

–

14.5

17.5

7.8

8.4

9.0

Min. Operating Voltage

After Turn On

9.0

8.5

11.5

7.0

7.6

8.2

*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

COMP

Error amp output, used to compensate error amplifier.

VFB

Error amp inverting input.

Sense

Noninverting input to Current Sense Comparator.

OSC

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

GND

Ground.

–

Pwr GND

Output driver ground.

VOUT

Output drive pin.

–

VCC Pwr

Output driver positive supply.

VCC

Positive power supply.

VREF

Output of 5.0 V internal reference.

–

2, 4, 6, 13

1, 2, 7, 8,

9, 16

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

1.0 k

Ω

1.0 W

2N2222

100 k

Ω

VCC

VREF

VOUT

GND

5.0 k

Ω

Sense

ADJUST

4.7 k

Ω

4.7 k

Ω

1.0 k

Ω

ERROR AMP

ADJUST

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