MIC3808 데이터 시트보기 (PDF) - Micrel

부품명

상세내역

일치하는 목록

MIC3808

Push-Pull PWM Controller

Micrel 

MIC3808/3809

Micrel

Parameter

Condition

Min Typ Max Units

Undervoltage Lockout Section

Start Threshold

MIC3808, Note 9

MIC3809

11.5 12.5 13.5

V

4.1

4.3

4.5

V

Minimum Operating Voltage

After Start

MIC3808

MIC3809

7.6

8.3

9

V

3.9

4.1

4.3

V

Hysteresis

MIC3808

MIC3809

3.5

4.2

5.1

V

0.1

0.2

0.3

V

Soft Start Section

COMP Rise Time

FB = 1.8V, Rise from 0.5V to 3V

2.5

20

ms

Overall Section

Startup Current

Operating Supply Current

VDD < Start Threshold

FB = 0V, CS = 0V, Notes 9 and 10

130 260

µA

1

2

mA

VDD Zener Shunt Voltage

IDD = 10mA, Note 12

13

14

15

V

Note 1.

Note 2.

Note 3.

Note 4.

Note 5.

Note 6.

Exceeding the absolute maximum rating may damage the device.

The device is not guaranteed to function outside its operating rating.

Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.

Measured at RC. Signal amplitude tracks VDD.

The COMP pin is internally clamped to 3.65V(typ). The COMP pin source current is tested at VCOMP = 3.0V to avoid interfering with this clamp

voltage. The minimum source current increases as VCOMP approaches VCLAMP.

∆VCOMP

Gain is defined by A = ∆VCS , 0 ≤ VCS ≤ 0.4V.

Note 7. Parameter measured at trip point of latch with FB at 0V.

Note 8. The internal current sink on the CS pin is designed to discharge an external filter capacitor. It is not intended to be a DC sink path.

Note 9. For MIC3808, set VDD above the start threshold before setting at 10V.

Note 10. Does not include current in the external oscillator network.

Note 11. Maximum operating voltage is equal to the VDD [zener] shunt voltage. When operating at or near the shunt voltage, care must be taken to limit

the VDD pin current to less than the 20mA VDD maximum supply current rating.

Note 12. Start threshold and Zener Shunt threshold track one another.

April 2005

5

MIC3808/3809

Share Link: