CS52845EDR14 datasheet(3/6 Pages) CHERRY

Part #	CS52845EDR14

Description	Current Mode PWM Control Circuit with 50% Max Duty Cycle

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Manufacturer	CHERRY [Cherry Semiconductor Corporation]

Direct Link	http://www.cherrycorp.com/

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Package Pin Description

PACKAGE PIN #

PIN SYMBOL

FUNCTION

Electrical Characteristics: Unless otherwise stated, specifications apply for -40 ≤ TA ≤ 85˚C; VCC = 15V (Note 1); RT = 10kΩ;

CT = 3.3nF for sawtooth mode.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

s

Total Standby Current

Start-Up Current

0.5

1.0

mA

Operating Supply Current

VFB=VSense=0V RT=10kΩ, CT=3.3nF

11

17

mA

VCC Zener Voltage

ICC=25mA

34

V

s

PWM Section

Maximum Duty Cycle

46

48

50

%

Minimum Duty Cycle

0

%

s

Undervoltage Lockout Section

Start Threshold

7.8

8.4

9.0

V

Min. Operating Voltage

After Turn On

7.0

7.6

8.2

V

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

8L

14L

SO Narrow

1

COMP

Error amp output, used to compensate error amplifier.

23

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

9

Gnd

Ground.

5

8

Pwr Gnd

Output driver Ground.

610

VOUT

Output drive pin.

711

VCCPwr

Output driver positive supply.

712

VCC

Positive power supply.

814

VREF

Output of 5V internal reference.

2,4,6,13

NC

No Connection.

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