SC4808B Просмотр технического описания (PDF) - Semtech Corporation

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Компоненты Описание

производитель

SC4808B

High Performance Dual Ended PWM Controller

Semtech Corporation 

SC4808A/B

POWER MANAGEMENT

Electrical Characteristics (Cont.)

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

Parameter

Test Conditions

VCC Under Voltage Lockout

Start Threshold (SC4808A)

Hysteresis (SC4808A)

Start Threshold (SC4808B)

Hysteresis (SC4808B)

Line Under Voltage Lockout

Start Threshold

R23 = 14kΩ, R33 = 10kΩ (see page 14)

Hysteresis

R23 = 14kΩ, R33 = 10kΩ (see page 14)

Soft Start

Internal Soft Start Ramp

Soft Start Duration (SC4808A)

Soft Start Duration (SC4808B)

Soft Start Delay

Oscillator

Oscillator Frequency

Oscillator Ramp

Rcs = 7kΩ

(See formula in the application

information section on page 21)

Rcs = 1kΩ

(See formula in the application

information section on page 21)

Rosc = 11kΩ, Cosc = 200pF

RC pin to GND capacitance

Oscillator Frequency Range

Sync/CLOCK

Clock SYNC Threshold(SC4808A)

Clock SYNC Threshold(SC4808B)

Sync Frequency Range

Bandgap

Reference Voltage (SC4808A)

Reference Current (SC4808A)

Reference Voltage (SC4808B)

Reference Current (SC4808B)

Overall

Startup Current

Operating Supply Current

VCC Zener Shunt Voltage

VCC < start threshold

FB = 0V, CS = 0V

IDD = 10mA

Min

10.75

3.5

4.0

40

-3%

450

50

4.75

2.970

16

Typ

12

4.5

4.40

70

VREF

5.6% of

VREF

200

110

12

140

500

VREF/2

+0.25

22

1.6

1.0

5.0

5

3.125

5

Max

13.25

5.5

4.5

110

+3%

550

1000

Fosc*1.3

5.25

3.280

150

7

Unit

V

V

V

mV

V

mV

µs/V

µs

µs

µs

KHz

V

pF

KHz

V

V

KHz

V

mA

V

mA

µA

mA

V

 2005 Semtech Corp.

3

www.semtech.com

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