SC4808B-1 데이터 시트보기 (PDF) - Semtech Corporation

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SC4808B-1

High Performance Dual Ended PWM Controller

Semtech Corporation 

SC4808B-1

POWER MANAGEMENT

Electrical Characteristics (Cont.)

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

Parameter

Test Conditions

Min

Typ

Max

Unit

VCC Under Voltage Lockout

Start Threshold

4.0

4.40

4.5

V

Hysteresis

100

140

180

mV

Line Under Voltage Lockout

Start Threshold

R23 = 14kΩ, R33 = 10kΩ (see page 11) -3% VREF +3%

V

Hysteresis

R23 = 14kΩ, R33 = 10kΩ (see page 11)

5.6% of

VREF

mV

Soft Start

Internal Soft Start Ramp

200

µs/V

Soft Start Duration

Rcs = 1kΩ

(See formula in the application

information section on page 18)

12

µs

Soft Start Delay

140

µs

Oscillator

Oscillator Frequency

Oscillator Ramp

Rosc = 11kΩ, Cosc = 200pF

450

500

550

KHz

VREF/2

V

+0.25

RC pin to GND capacitance

22

pF

Oscillator Frequency Range

50

1000

KHz

Sync/CLOCK

Clock SYNC Threshold

1.0

V

Sync Frequency Range

Bandgap

Fosc*1.3 KHz

Reference Voltage

2.970 3.125 3.280

V

Reference Current

5

mA

Overall

Startup Current

VCC < start threshold

150

µA

Operating Supply Current

FB = 0V, CS = 0V

7

mA

VCC Zener Shunt Voltage

IDD = 10mA

16

V

 2006 Semtech Corp.

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www.semtech.com

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