A8512 Просмотр технического описания (PDF) - Allegro MicroSystems

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A8512

LED Backlight Driver for LCD Monitors and Televisions

Allegro MicroSystems 

A8512

LED Backlight Driver for LCD Monitors and Televisions

ELECTRICAL CHARACTERISTICS Valid at VIN = 12 V; TA = 25°C, RFSET = 52 kΩ, RISET = 12.4 kΩ, except indicates

specifications guaranteed over the full operating temperature range with TA = TJ , unless otherwise noted

Characteristics

Symbol

Test Conditions

Min. Typ.1 Max.

Input Voltage Range

Internal Bias Voltage Range

Internal Gate Driver Voltage

Undervoltage Lockout Threshold for VIN

Undervoltage Lockout Hysteresis for VIN

VIN

VBIAS

VDRIVER

VUVLO

VUVLOHYS

VIN ≥ 10 V

VIN falling

Switching at no load

8

–

24

4.75 – 5.5

6.5 –

8

5.7 6.5 6.8

– 0.55 –

–

7

–

Supply Current2

IVIN

Shutdown, EN = VIL, TA = 25°C

Standby, EN = VIH, PWM = VIL, soft start

completed

– 0.1 1

–

2

3

Boost Controller

Switching Frequency

Minimum Switch Off-Time

Minimum Switch On-Time

Logic Input Levels (EN and PWM pins)

fSW

toff(min)

ton(min)

Driver output

Driver output

0.8 1 1.25

–

72

–

–

72

–

Input Voltage Level Low

Input Voltage Level High

Input Leakage Current2

Error Amplifier

VIL

VIH

IIN

EN = PWM = 5 V

–

– 0.4

1.5 –

–

– 100 –

COMP Pin Source Current

COMP Pin Sink Current

COMP Pin Pull-Down Resistance

Driver Section

IEA(src)

IEA(snk)

RCOMPPD

VCOMP = 1.5 V

VCOMP = 1.5 V

¯F¯ ¯A¯¯U¯¯L¯ ¯T¯ = 0

– 160 –

–

20

–

– 1000 –

Peak Source Current5

Peak Sink Current5

High Side Gate Drive On Resistance

Low Side Gate Drive On Resistance

Sense Overcurrent Threshold Voltage

LED Current Sinks

Ipk(src)

Ipk(snk)

RDS(on)H

RDS(on)L

VSEN

Measured at VDRIVER = 0 V

Measured at VDRIVER = VREG7V

Measured at VDRIVER = VREG7V / 2

Measured at VDRIVER = VREG7V / 2

VSENSE1 – VSENSE2

–

2

–

–

2

–

–

4

–

–

3

–

80 95 110

LEDx Pin Regulation Voltage

ISET to ILEDx Current Gain

ISET Pin Voltage

ISET Allowable Current Range2

VLEDx

AISET

VISET

ISET

ILED = 80 mA

ISET = 100 μA

– 1.4 –

– 640 –

– 1.235 –

41

– 190

Unit

V

V

V

V

V

mA

μA

mA

MHz

ns

ns

V

V

μA

μA

μA

kΩ

A

A

Ω

Ω

mV

V

A/A

V

μA

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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