AS2208 Ver la hoja de datos (PDF) - Unspecified

Número de pieza

componentes Descripción

Fabricante

AS2208

Primary Side PWM Controller

Unspecified 

Primary Side PWM Controller

AS2208

Pin Function Description

Pin Number Function

1

COMP

2

ISNS

3

RT/CT

4

OV

5

GND

6

OUT

7

VCC

8

VREG

Description

This is the inverting input to the PWM comparator. A divided and level shifted

representation of this voltage is compared to the ISNS input to determine OUT duty

cycle. A 1 mA current source is provided as a pull-up for an optocoupler.

A voltage proportional to inductor current is connected to this pin. The PWM uses this

information to terminate the gate drive of the output.

Oscillator frequency and maximum duty cycle are set by connecting a resistor (RT) to

VREG and a capacitor (CT) to ground.

This pin latches OUT low when pulled above 2.5 V. The latch can be reset by pulling

OV above 4 V then back to ground.

Circuit common ground.

This totem pole output is designed to directly drive a power MOSFET switch capable of

sourcing and sinking peak currents up to 1 A.

Positive supply voltage for the IC.

Output of 5V series regulator.

Absolute Maximum Ratings

Parameter

Symbol

Rating

Unit

Supply Voltage (ICC < 30 mA)

VCC

Self-Limiting

V

Supply Voltage (Low Impedance Source)

VCC

20

V

Reference Current

IREF

200

mA

Output Current

IOUT

1

A

Output Voltage

VOUT

20

V

Continuous Power Dissipation at 25° C

PD

500

mW

Junction Temperature

TJ

150

°C

Storage Temperature Range

TSTG

– 65 to 150

°C

Lead Temperature, Soldering 10 Seconds

TL

300

°C

Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress

rating only and functional operation of the device at these or any other conditions above indicated in the operational sections of this

specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

Recommended Conditions

Typical Thermal Resistance

Parameter

Supply Voltage

Oscillator

Symbol

VCC

FOSC

Rating

10 - 15

50 - 250

Unit

V

kHz

Package

8L PDIP

8L SOIC

θJA

95° C/W

175° C/W

θJC Typical Derating

50° C/W 10.5 mW/°C

45° C/W

5.7 mW/°C

ASTEC Semiconductor

79

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