A8513 データシートの表示（PDF） - Allegro MicroSystems

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A8513

Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver

Allegro MicroSystems 

A8513

Wide Input Voltage Range, High Efficiency

Fault Tolerant LED Driver

ELECTRICAL CHARACTERISTICS1 Valid at VIN = 16 V, TA = 25ºC, indicates specifications guaranteed through the full

operating temperature range with TA = TJ = –40ºC to125 ºC, typical specifications are at TA = 25ºC; unless otherwise specified

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Input Voltage Specifications

Operating Input Voltage Range

VIN Pin UVLO Start Threshold

VIN Pin UVLO Stop Threshold

VIN Pin UVLO Hysteresis

Input Current

VIN

VUVLOrise

VUVLOfall

VUVLOhys

VIN rising

VIN falling

4.5

−

40

V

−

−

4.35

V

−

−

3.90

V

−

450

−

mV

Input Quiescent Current

IQ

Input Sleep Supply Current

IQSLEEP

Input Logic Levels (EN/PWM and ¯F¯¯A¯¯U¯¯L¯¯T¯ 3)

EN/PWM = VIH , SW = 2 MHz, no load

VIN = 16 V, EN/PWM = 0 V

−

5

−

mA

−

1

10

μA

Input logic Level (Low)

Input logic Level (High)

EN/PWM Pull-Down Resistor

¯F¯¯A¯¯U¯¯L¯¯T¯ Pin Pull-Down Voltage

¯F¯¯A¯¯U¯¯L¯¯T¯ Pin Leakage Current

Error Amplifier

VIL

VIH

REN/PWM

VFAULT

IFAULTlkg

5 V < VIN < 40 V

5 V < VIN < 40 V

EN/PWM = 5 V

IFAULT = 0.5 mA

VFAULT = 5 V

−

−

400

mV

1.5

−

−

V

−

100

−

kΩ

−

−

0.4

V

−

−

1

μA

Open Loop Voltage Gain

Transconductance

Source Current

Sink Current

COMP Pin Pull-Down Resistance

Output Overvoltage Protection

AVOL

gm

IEA(SRC)

IEA(SINK)

RCOMP

ΔICOMP = ±10 μA

VCOMP = 1.5 V

VCOMP = 1.5 V

¯F¯¯A¯¯U¯¯L¯¯T¯ asserted

−

45

−

dB

−

990

−

μA/V

−

–360

−

μA

−

360

−

μA

−

2000

−

Ω

Overvoltage Protection Threshold

OVP Pin Leakage Current

OVP Pin Undervoltage Threshold

Secondary Overvoltage Protection

BOOST Switch

VOVPHI(th)

IOVPH

VUVP(th)

VOVP(sec)

Measured at OVP Pin

Standard CMOS input, measured at

VOVP = 1.2 V

Measured at OVP Pin

Measured at SW Pin

1.168

1.218

1.268

V

−

−

100

nA

−

−

110

mV

53

55.5

58

V

Switch On-Resistance

Switch Leakage Current

Switch Current Limit

Secondary Switch Current Limit

RDS(on)SW

ISWlkg

ISW(LIM)

ISW(LIM2)

ISW = 750 mA, VIN = 16 V

VSW = 16 V, EN/PWM = VIL , TA = TJ

between –40ºC and 85ºC

VSW = 16 V, EN/PWM = VIL , TA = TJ = 125ºC

Higher than ISW(LIM)(max) in all conditions,

A8513 latches when detected

−

450

800

mΩ

−

0.1

1

uA

−

10

−

uA

1.9

2.2

2.8

A

3

3.5

4.64

A

Minimum Switch On-Time

Minimum Switch Off-Time

tSW(ON)

tSW(OFF)

−

75

100

ns

−

55

85

ns

Continued on the next page…

Allegro MicroSystems, Inc.

5

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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