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A4401

Automotive Quasi-Resonant Flyback Control IC

Allegro MicroSystems 

A4401

Automotive Quasi-Resonant Flyback Control IC

ELECTRICAL CHARACTERISTICS1,2 valid at TJ = –40°C to +150°C, VIN = 7 to 40 V (unless noted otherwise)

Characteristics

Symbol

Test Conditions

Min.

Typ.

General

VIN Quiescent Current

LX Leakage Current

LX Input Bias Current

Minimum Frequency

Soft Start

Gate Drive

IINOFF

IINON

ILXLEAK

ILX

fSW

tSS

EN = Low

EN = High, no MOSFET switching

EN = Low, VLX = 40 V

EN = High, VLX = 60 V

–

–

–

2.3

–

–

–

–

25

35

5

10

Drive High Voltage, VIN > 10 V

Drive High Voltage, 10 V > VIN > 7 V

Rise Time, VIN > 10 V

Rise Time, 10 V > VIN > 7 V

Fall Time, VIN > 10 V

Fall Time, 10 V > VIN > 7 V

Current Sense Input

VGDH

tr

tf

CLOAD = 1 nF, 10% to 90% of VGS= 9 V

CLOAD = 1 nF, 10% to 90% of VGS , VIN = 7 V

CLOAD = 1 nF, 90% to 10% of VGS = 0 V

CLOAD = 1 nF, 90% to 10% of VGS , VIN = 7 V

–

8.4

–

VIN – 0.5

–

60

–

90

–

30

–

40

Maximum Sense Voltage (Current Limit)

Sense Input Bias Current

Current Sense Blanking

Reference Supply

VCL

IISS

tBLANK

VISS = –300 mV to 1 V

600

800

–

–

100

145

Reference Voltage Tolerance

VREF

Operational Transconductance Amplifier

1.180

1.205

Output Impedance

Gm Constant3

Output Source Current

Output Sink Current

Input Bias Current

Enable Input

ZOP

KGm

ISRC

ISIN

IBIAS

VCOMP = 1.4 V, VA = 1.06 V, TA = 25ºC

VCOMP = 1.4 V, VA= 1.36 V, TA = 25ºC

10

–

–

470

–30

–25

20

25

–

–100

EN Input Low Voltage

EN Input High Voltage

EN Input Hysteresis

EN Input Current

Protection

VIL

VIH

VIhys

IINL

IINH

VIN = 0 V

VIN = 14 V

VIN = 40 V

–

–

2.4

–

200

500

–10

–

–

–

–

–

VIN Turn-On Threshold

VUVON Voltage rising

5.4

–

VIN Turn-Off Threshold

VUVOFF Voltage falling

4.9

–

Undervoltage Hysteresis

VUVhys

–

0.5

Overtemperature Shutdown

TJSD Temperature increasing

–

165

Overtemperature Hysteresis

TJSDhys

–

15

1For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.

2Specifications over operating temperature range are assured by design and characterization.

3Guaranteed by design.

Max.

10

3.3

1

145

45

15

9.5

VIN – 0.25

–

–

–

–

1000

10

190

1.230

–

–

–20

30

–

0.8

–

–

10

50

200

7

6.5

–

–

–

Units

μA

mA

μA

μA

kHz

ms

V

V

ns

ns

ns

ns

mV

μA

ns

V

MΩ

μS

μA

μA

nA

V

V

mV

μA

μA

μA

V

V

V

ºC

ºC

Allegro MicroSystems, Inc.

4

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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