CP494 datasheet(2/11 Pages) CERAMATE

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CP494

SWITCHMODE Pulse Width Modulation Control Circuit

* All specs and applications shown above subject to change without prior notice.

1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU ,

TAOYUAN, TAIWAN

Email: server@ceramate.com.tw

Tel:886-3-3214525

Http: www.ceramate.com.tw

Fax:886-3-3521052

Page 2 of 11

Rev 1.0 Apr.19,2004

RECOMMENDED OPERATING CONDITIONS

Characteristics

Symbol

Min

Typ

Max

Unit

Power Supply Voltage

VCC

7.0

Collector Output Voltage

VC1, VC2

–

Collector Output Current (Each transistor)

IC1, IC2

–

200

Amplified Input Voltage

Vin

–0.3

–

VCC – 2.0

Current Into Feedback Terminal

lfb

–

0.3

Reference Output Current

lref

–

Timing Resistor

1.8

500

Timing Capacitor

0.0047

0.001

Oscillator Frequency

fosc

1.0

200

kHz

ELECTRICAL CHARACTERISTICS (VCC = 15 V, CT = 0.01 mF, RT = 12 kW, unless otherwise noted.)

For typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies, unless otherwise noted.

Characteristics

Symbol

Min

Typ

Max

Unit

REFERENCE SECTION

Reference Voltage (IO = 1.0 mA)

Vref

4.75

5.0

5.25

Line Regulation (VCC = 7.0 V to 40 V)

Regline

–

2.0

Load Regulation (IO = 1.0 mA to 10 mA)

Regload

–

3.0

Short Circuit Output Current (Vref = 0 V)

ISC

OUTPUT SECTION

Collector Off–State Current

(VCC = 40 V, VCE = 40 V)

IC(off)

–

2.0

100

Emitter Off–State Current

VCC = 40 V, VC = 40 V, VE = 0 V)

IE(off)

–

–100

Collector–Emitter Saturation Voltage (Note 2)

Common–Emitter (VE = 0 V, IC = 200 mA)

Emitter–Follower (VC = 15 V, IE = –200 mA)

Vsat(C)

Vsat(E)

–

1.1

1.5

1.3

2.5

Output Control Pin Current

Low State (VOC v 0.4 V)

High State (VOC = Vref)

IOCL

IOCH

–

0.2

–

3.5

Output Voltage Rise Time

Common–Emitter (See Figure 12)

Emitter–Follower (See Figure 13)

–

100

200

Output Voltage Fall Time

Common–Emitter (See Figure 12)

Emitter–Follower (See Figure 13)

–

100

2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.

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