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

7.0

15

40

V

Collector Output Voltage

–

30

40

V

Collector Output Current (Each transistor)

–

–

200

mA

Amplified Input Voltage

–0.3

–

V

Current Into Feedback Terminal

–

–

0.3

mA

Reference Output Current

–

–

10

mA

Timing Resistor

1.8

30

500

k

W

Timing Capacitor

0.0047

0.001

10

mF

Oscillator Frequency

1.0

40

200

kHz

Characteristics

Symbol

Min

Typ

Max

Unit

REFERENCE SECTION

4.75

5.0

5.25

V

–

2.0

25

mV

–

3.0

15

mV

15

35

75

mA

OUTPUT SECTION

Collector Off–State Current

–

2.0

100

mA

Emitter Off–State Current

–

–

–100

mA

Collector–Emitter Saturation Voltage (Note 2)

–

–

1.1

1.5

1.3

2.5

V

Output Control Pin Current

–

–

10

0.2

–

3.5

mA

mA

Output Voltage Rise Time

Common–Emitter (See Figure 12)

Emitter–Follower (See Figure 13)

–

–

100

100

200

200

ns

Output Voltage Fall Time

Common–Emitter (See Figure 12)

Emitter–Follower (See Figure 13)

–

–

25

40

100

100

ns

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