ASM8P1843 datasheet(5/11 Pages) ALSC

5 / 11 page

ASM8P18S42 / ASM8P18S42ER

ASM8P1843 / ASM8P18S43ER

June 2005

ASM8P18S44ER / ASM8P18S45ER

rev 0.6

Voltage Mode PWM Controller with EMI Reduction

5 of 11

Notice: The information in this document is subject to change without notice.

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Rise Time

TA = 25°C, CL=1nF

Fall Time

TA = 25°C, CL=1nF

Shoot Through Current

UVLO SECTION

ASM8P1843,

ASM8P18S43ER,

ASM8P18S45ER,

7.8

Start threshold

Vth(START)

ASM8P18S42,

ASM8P18S42ER

ASM8P18S44ER

15.4

ASM8P1843,

ASM8P18S43ER,

ASM8P18S45ER

6.7

Stop Threshold

Vth(STOP)

ASM8P18S42,

ASM8P18S42ER,

ASM8P18S44ER

10.2

PWM SECTION

PWM frequency

400

kHz

ASM8P18S44ER,

ASM8P18S45ER

Duty Cycle Range

ASM8P18S42,

ASM8P18S42ER,

ASM8P1843,

ASM8P18S43ER

TOTAL DEVICE

Start up Current

IST

275

Peak Output Current

IOUT(PK)

1000

Operating Current

ICC(OPR)

VFB = 0; ISNS = 0.5;

VDD = 15V

Thermal Shutdown

Junction Temp

155

°C

Thermal Recovery

126

°C

SPREAD SPECTRUM SECTION

ASM8P18S43ER,

ASM8P18S45ER

1/20

Modulation Rate

ASM8P18S42,

ASM8P18S42ER,

ASM8P18S44ER

1/10

of Switching

Frequency

(KHz)

Modulation Depth

Refer RD Resistor Vs. % Modulation Depth Plot

OSCILLATOR SECTION

Frequency change with Voltage

Df/d VCC

0.04

0.05

Oscillator Amplitude

1.66

V (Pk-Pk)

Temperature Stability

TOSC

0.1

°C

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