CS2844 datasheet(3/6 Pages) CHERRY

3 / 6 page

CS2844/CS2845

CS3844/CS3845

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX UNITS

CS2844

CS3844

CS2845/CS3845

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX MIN

TYP

MAX UNITS

Notes:

1. Adjust Vcc above the start threshold before setting at 15V.

3. Parameter measured at trip point of latch with VFB=0.

2.These parameters, although guaranteed, are not 100% tested in production.

4. Gain defined as:

A =

; 0 ≤ VSense ≤ 0.8V.

∆VCOMP

∆VSense

Under-Voltage Lockout Section

Start Threshold

14.5

17.5

7.8

8.4

9.0

Min. Operating

After Turn On

8.5

11.5

7.0

7.6

8.2

Voltage

Package Pin Description

PACKAGE PIN #

PIN SYMBOL

FUNCTION

Total Standby Current

Start-Up Current

0.5

1.0

0.5

1.0

Operating Supply Current

VFB=VSense=0V RT=10kΩ, CT=3.3nF

VCC Zener Voltage

ICC=25mA

PWM Section

Maximum Duty Cycle

Minimum Duty Cycle

14L

16L

PDIP/SO

SO Narrow

SO Wide

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, resis-

tor to VREF.

Gnd

Ground.

Pwr Gnd

Output driver Ground.

610

VOUT

Output drive pin.

VCCPwr

Output driver positive supply.

712

VCC

Positive power supply.

814

VREF

Output of 5V internal reference.

2,4,6,13

1,2,7,8,9,16

No Connection.

Electrical Characteristics: -25≤TA≤85˚C for CS2844/2845, 0≤TA≤70˚C for CS3844/3845. VCC=15V (Note 1); RT=10kΩ,

CT=3.3nF for sawtooth mode., unless otherwise stated.

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