A8513KLYTR-T Просмотр технического описания (PDF) - Allegro MicroSystems

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A8513KLYTR-T

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 (continued) 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

Oscillator Frequency

A8513KLYTR-1-T, A8513KLPTR-1-T

1.8

2

2.2

MHz

Oscillator Frequency

A8513KLYTR-2-T, A8513KLPTR-2-T

fSW

A8513KLYTR-3-T, A8513KLPTR-3-T

0.9

1

1.1

MHz

450

500

550

kHz

A8513KLYTR-4-T, A8513KLPTR-4-T

225

250

275

kHz

LED Current Sinks

LED Accuracy

LED Regulation Voltage

ISET to ILED Current Gain

ISET Pin Voltage

Allowable ISET Current

Soft Start LED Current Gain

ErrLED

VLED

AISET

VISET

ISET

AILEDSS

ISET = 150 μA

ISET = 150 μA

ISET = 150 μA

Current through enabled LED pin during

soft start

−

−

3

%

−

880

−

mV

1014

1045

1076

A/A

−

1.003

−

V

40

−

160

μA

−

48

−

A/A

Maximum PWM Dimming Off-Time

tPWML

Measured while EN/PWM = low during

dimming control, and internal references

are powered-on (exceeding tPWML results in

shutdown)

−

16

−

ms

Minimum PWM On-Time

EN/PWM High to LED-On Delay

EN/PWM Low to LED-Off Delay

Thermal Protection (TSD)

tPWMH

tdPWM(on)

tdPWM(off)

First cycle when powering-up A8513

Time between PWM enable and when LED

current reaches 90% of maximum;

VPWM = 0 → 2 V

Time between PWM enable going low

and when LED current reaches 10% of

maximum; VPWM = 2 → 0 V

−

1.5

3

μs

−

250

500

ns

−

250

500

ns

Thermal Shutdown Threshold2

TTSD Temperature rising

−

165

−

ºC

Thermal Shutdown Hysteresis2

TTSDHYS

−

20

−

ºC

1For input and output current specifications, negative current is defined as coming out of the node or pin (sourcing), and positive current is defined as

going into the node or pin (sinking).

2Ensured by design and characterization, not production tested.

3 ¯F¯¯A¯¯U¯¯L¯¯T¯ pin is high voltage tolerant

Allegro MicroSystems, Inc.

6

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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