ASM8I1843F-08-MX datasheet(5/11 Pages) ALSC

Part #	ASM8I1843F-08-MX

Description	Voltage Mode PWM Controller with EMI Reduction

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Manufacturer	ALSC [Alliance Semiconductor Corporation]

Direct Link	https://www.alliancememory.com

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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

tR

TA = 25°C, CL=1nF

30

nS

Fall Time

tF

TA = 25°C, CL=1nF

30

nS

Shoot Through Current

0

UVLO SECTION

ASM8P1843,

ASM8P18S43ER,

ASM8P18S45ER,

7.8

Start threshold

Vth(START)

ASM8P18S42,

ASM8P18S42ER

ASM8P18S44ER

15.4

V

ASM8P1843,

ASM8P18S43ER,

ASM8P18S45ER

6.7

V

Stop Threshold

Vth(STOP)

ASM8P18S42,

ASM8P18S42ER,

ASM8P18S44ER

10.2

PWM SECTION

PWM frequency

fS

40

400

kHz

ASM8P18S44ER,

ASM8P18S45ER

0

50

Duty Cycle Range

ASM8P18S42,

ASM8P18S42ER,

ASM8P1843,

ASM8P18S43ER

0

95

%

TOTAL DEVICE

Start up Current

IST

275

?A

Peak Output Current

IOUT(PK)

1000

mA

Operating Current

ICC(OPR)

VFB = 0; ISNS = 0.5;

VDD = 15V

5

6

mA

Thermal Shutdown

VZ

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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