Datasheet > AS3649

AS3649

更新时间： 2022-02-26 13:33:21

品牌	Logo	应用领域
艾迈斯 - AMSCO		/
页数	文件大小	规格书
39页	3486K
描述
2500mA High Current LED Flash Driver

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AS3649 数据手册

AS3649

Datasheet - Electrical Characteristics

Table 3. Electrical Characteristics (Continued)

Symbol

Parameter

Condition

Min

Typ

Max

Unit

Minimum voltage between pin VOUT1/2 and LED_OUT1/

2 for operation of the current source with current_boost=0

VILED_COMP

230

LED_OUT current source

voltage compliance

VILED_COMP

VILED_COMP with current_boost=1

290

_BOOST

Represents a maximum connection length of 10cm (LED

connection and ground return path)

LLED_CONNECT

ION

LED connection inductance

100

5.6

Protection and Fault Detection Functions (see page 12)

VVOUT overvoltage

VVOUTMAX

DCDC Converter Overvoltage Protection

5.0

5.3

protection

Current Limit for coil

LDCDC (Pin SW)

coil_peak=00b

coil_peak=01b

2.25

2.61

2.5

2.9

2.75

3.19

measured at 25% PWM

duty cycle³

coil_peak (see page

23)=10b

ILIMIT

Default value

3.0

3.3

3.7

3.63

4.1

maximum 40000s lifetime

operation in overcurrent

limit

coil_peak=11b

Flash LED short circuit

detection voltage

VLEDSHORT

TOVTEMP

Voltage measured between pins LED_OUT1,2 and GND

Junction temperature

1.2

144

Overtemperature

Protection

ºC

TOVTEMPHYS

Overtemperature

Hysteresis

Can be adjusted with register flash_timeout (page 26)

1124

+7.5

2.5

tFLASHTIMEO

Flash Timeout Timer

Undervoltage Lockout

Accuracy

-7.5

2.25

Falling VVIN

2.4

VUVLO

VUVLO VUVLO VUVLO

+0.05

Rising VVIN

+0.1

+0.15

Defined by vin_low_v - see Current Reduction by VIN

Measurements in Flash Mode and Diagnostic Pulse on

page 15

Battery Low Voltage

Protection

3.0-

3.47

VIN_LOW_VOLTA

-2.5%

+2.5%

Protection and Fault Detection Functions - NTC

Range

-7

-5

600

µA

Adjustable by ntc_current (page

25) in 40µA steps

INTC

NTC Current Source

I - accuracy

V(NTC) <= 1.7V

µA

If ntc_on (page 25)=1 and the voltage on NTC drops

below VNTC_TH, any flash/torch or pwm operation of

LED_OUT is stopped

Threshold for

overtemperature

VNTC_TH

1.0

ADC

Resolution

Range

bits

full

ADC Code

scale

ADC input range; channel

selected by

adc_channel (page 27)

NTC

0.0

2.2

5.5

VIN

TJUNC (AS3649 junction temperature)

see Table 6

ºC

% full

scale

NTC

-1.5

+1.5

ADC measurement

accuracy

Accuracy

TJUNC (-30ºC...150ºC)

TJUNC (0ºC...85ºC)

-8

-5

ºC

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