SC4808CMSTRT View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC4808CMSTRT

High Performance Dual Ended PWM Controller

Semtech Corporation 

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless specified: VCC = 12V; CL = 100pF; TA = -40°C to 105°C

Parameter

Test Conditions

VCC Under Voltage Lockout

Turn-on

Turn-off

Line Under Voltage Lockout

Start Threshold

RTOP = 14kΩ, RBOT = 10kΩ

Hysteresis

RTOP = 14kΩ, RBOT = 10kΩ

Soft Start

Internal Soft Start Ramp

Soft Start Duration

Soft Start Delay

Rcs = 1kΩ

(See formula in the Application

Information Soft Start section)

Oscillator

Oscillator Frequency

Oscillator Ramp

Rosc = 11kΩ, Cosc = 200pF

RC pin to GND capacitance

Oscillator Frequency Range

Sync/CLOCK

Clock SYNC Threshold

Sync Frequency Range

Bandgap

Reference Voltage

Reference Current

Overall

Startup Current

Operating Supply Current

VCC Zener Shunt Voltage

VCC < start threshold

FB = 0V, CS = 0V

IDD = 10mA

SC4808C

Min

Typ

Max

Unit

7.5

8

8.5

V

6.5

7

7.5

V

-3% VREF +3%

V

5.6% of

VREF

mV

200

µs/V

12

µs

140

µs

450

500

550

KHz

VREF/2

V

+0.25

22

pF

50

1000

KHz

1.0

V

Fosc*1.3 KHz

2.970 3.125 3.280

V

5

mA

150

µA

7

mA

16

V

 2006 Semtech Corp.

3

www.semtech.com

Share Link: