APW7145 datasheet(4/23 Pages) ANPEC

4 / 23 page

Rev. A.7 - Mar., 2011

APW7145

www.anpec.com.tw

Electrical Characteristics (Cont.)

Refer to the “Typical Application Circuits”. These specifications apply over VIN=12V, VOUT=3.3V and TA= -40 ~ 85°C, unless otherwise

specified. Typical values are at TA=25°C.

APW7145

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

OSCILLATOR AND DUTY CYCLE

FOSC

Oscillator Frequency

TJ = -40 ~ 125

oC, V

IN = 4.75 ~ 14V

450

500

550

kHz

Foldback Frequency

VOUT = 0V

kHz

Maximum Converter’s Duty

TON_MIN

Minimum Pulse Width of LX

150

CURRENT-MODE PWM CONVERTER

Error Amplifier Transconductance

VFB=VREF±50mV

200

µA/V

Error Amplifier DC Gain

COMP = NC

Current-Sense to COMP Voltage

Transresistance

0.1

V/A

Between VIN and Exposed Pad,

VIN = 5V, TJ=25°C

100

High-Side Switch Resistance

Between VIN and Exposed Pad,

VIN = 12V, TJ=25°C

Ω

Between GND and Exposed Pad,

VIN = 5V, TJ=25°C

100

Low-Side Switch Resistance

Between GND and Exposed Pad,

VIN = 12V, TJ=25°C

Ω

PROTECTIONS

ILIM

High-Side Switch Current-limit

Peak Current

6.5

VTH_UV

FB Under-Voltage Threshold

VFB falling

VTH_OV

FB Over-Voltage Threshold

VFB rising

118

123

128

FB Under-Voltage Debounce

µs

TOTP

Over-Temperature Trip Point

150

Over-Temperature Hysteresis

Dead-Time

VLX = -0.7V

SOFT-START, SOFT-STOP, ENABLE, AND INPUT CURRENTS

TSS

Soft-Start / Soft-Stop Interval

1.5

2.5

EN Low Logic Level

VEN falling

0.5

EN High Logic Level

VEN rising

2.1

High-side Switch Leakage Current

VEN = 0V, VLX = 0V

µA

IFB

FB Pin Input Current

-100

+100

IEN

EN Pin Input Current

VEN = 0V ~ VIN

-100

+100

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