ASM8P1843 datasheet(4/11 Pages) ALSC

4 / 11 page

ASM8P18S42 / ASM8P18S42ER

ASM8P1843 / ASM8P18S43ER

June 2005

ASM8P18S44ER / ASM8P18S45ER

rev 0.6

Voltage Mode PWM Controller with EMI Reduction

4 of 11

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

Electrical Characteristics

Unless otherwise noted, VDD=15V, Capacitor on FSEL = 330pf, ISENS = 0.5V. Specifications are over the –40°C to +85°C ambient temperature range. Typical

values are at 25°C.

Parameter

Symbol

Conditions

Min

Typ

Max

Units

REFERENCE SECTION

ASM8P18S42 & ASM8P1843

Output voltage

VREF

TA = +25°C, IOUT = 1mA

4.90

5.00

5.1

Line Regulation

N VREF

12V < VDD < 18V, IOUT = 5?A

Total Reference variation

Line, Temperature

0.7

Temperature Stability

TCREF

0.5

mV/°C

Load Regulation (ASM8P1843)

ImA < Io < 20mA

ERROR AMPLIFIER SECTION

Input Bias Current

IBIAS

-20

Input Voltage

Vpin1 = 1.25V

1.2

1.25

1.3

Open Loop Voltage Gain

AVOL

Power Supply Rejection Ratio

PSRR

VSTART < VCC < VCC max

Output Sink Current

IOL

VFB = 1.32V, VCOMP = 0.15V

-1.5

Output Source Current

IOH

VFB = 1.18V, VCOMP = 4.17V

0.3

High Output Voltage

VOH

VFB = 1.25V, RL = 15KP

4.17

Low Output Voltage

VOL

VFB = 1.25V

0.15

CURRENT SENSE SECTION

Over Current Protection

Threshold

VI(MAX)

FB = 0V (VCOMP = 5V)

0.90

1.00

1.10

Delay to output

TPD

VFB = 0V, ISNS = 0 to 2V

125

Under Current Sense Period

TUCS

200

Under Current Recovery Period

TUCSD

Cycles of PWM

Frequency

ASM8P18S42,

ASM8P18S42ER

1/4

ASM8P1843

ASM8P18S43ER

ASM8P18S44ER

1/10

Cycle Skip

condition:

ISENS R

0.1V

ASM8P18S45ER

Skip

x fS

OUTPUT SECTION

Low Output Voltage

VOL

ISINK = 50mA

ISINK = 200mA

0.128

0.470

High Output Voltage

VOH

ISOURCE = 50mA

ISOURCE = 200mA

At VDD

=15V

14.71

13.77

On Resistance, High

RDS(ON)H

ISOURCE = 0.2A

6.5

On Resistance, Low

RDS(ON)L

ISINK = 0.2A

2.5

ASM8P1843 Datasheet(PDF) 4 Page - Alliance Semiconductor Corporation

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