Datasheet > AC242E-F8A-G-LF-TR

AC242E-F8A-G-LF-TR

更新时间： 2022-12-01 19:04:52

品牌	Logo	应用领域
美高森美 - MICROSEMI		/
页数	文件大小	规格书
8页	201K
描述
Switching Controller

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Power Management AAC242/243

PARAMETER

PARAMETERS

TYP.

UNITS

CONDITIONS

MIN.

MAX.

OUTPUT SECTION

Voltage Out Low

0.4

2.2

Isink = 20mA

Isink = 200mA

Isink = 20mA

Voltage Out Low

Voltage Out High

13.5

12.5

Voltage Out High

13.5

Isink = 200mA

Vcc=6V, Isink = 1mA

C_L=1000pF

Voltage Out UVLO

1.1

Voltage Output Rise Time

Voltage Output Fall Time

Current Output Source Peak

Current Output Sink Peak

C_L=1000pF

1.2

0.7

UNDER-VOLTAGE LOCKOUT SECTION

Voltage Start Threshold (142)

Voltage Start Threshold (143)

Voltage Turnoff Threshold (142)

Voltage Turnoff Threshold (143)

Zener Clamp Voltage

7.8

8.4

8.2

7.6

I_cc≤25mA

TOTAL DEVICE SECTION

Start-up Supply Current

0.4

0.6

Operating Supply Current

The improved switching performance increases the high peak current associated with internal and external

capacitances and will require careful grounding and PCB trace routing. Bypass and timing capacitors should be of

high quality and located carefully with short traces. The reference capacitor must be located very close to the IC

with minimum trace lengths. A single point ground should be located at pin 5 ground. The use of a good ground

plane is recommended. Under certain conditions of high peak currents it may be advisable to isolate the Vref pin

from the bypass capacitor with a resistor to prevent interaction of the high current with the internal oscillator

operation.

Charge and discharge times are given by the following formulas:

T_C=0.55R_tC_t

T_D=R_tC_tLn[(0.0063R_t-2.7)/(0.0063R_t-4)]

Frequency =( T_C+ T_D)^-1

Oscillator simplified circuit.

COMP

Vref

Vcc

Isense

R/C

OUT

GND

–

AADS00012 / R127B

Preliminary

October 2010 4 / 8

1 2 345 6 7 8

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