AS3685A datasheet(6/25 Pages) AMSCO

6 / 25 page

AS3685A/AS3685B

Datasheet

www.austriamicrosystems.com/

AS3685

(ptr)

Revision 2.2

5 - 24

Table

4 – Current Source (Sink) Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

ITORCH2ISET

Torch Current to Bias Current

Ratio

1639

A/A

AS3685A, EN1=0, EN2=1

(150mA with RISET = 14.2kΩ)

400

AS3685A, EN1=1, EN2=1 or

AS3685B with ILED>350mA

(with RISET = 14.2kΩ)

VSWITCH

Mode Switching Threshold on

V(ILED) between 1:1 -> 1:1.5

and 1:1.5 -> 1:2

150

200

250

All lower currents

Table

5 –Digital Interface characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

VIH

High Level Input voltage

1.5

VBAT

VIL

Low Level Input voltage

0.0

0.5

ILEAKAGE

Input pin leakage current

-10

μA

tPULSEWIDTH

Pulsewidth for signals on EN1

and EN2 (high or low pulses)

1.0

unlimited

μs

For Pins EN1 and EN2

Do not leave EN1 and EN2

floating; (47kΩ pulldowns can

be used)

Table

6 – Protection Functions

Symbol

Parameter

Min

Typ

Max

Unit

Note

TOVTEMP

Overtemperature protection

140

°C

TOVTEMPHYST

Overtemperature protection

Hysteresis

°C

If the junction temperature

exceeds TOVTEMP, the current

sink will be disabled and the

charge pump switched back

into 1:1 mode until the

temperature drops below

TOVTEMP - TOVTEMPHYST

tFLASHTIMEOUT

Flash Timeout Time

-20%

800

+20%

AS3685A, EN1=1, EN2=1 or

AS3685B flash modes

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