LIA120STR datasheet(2/10 Pages) IXYS

2 / 10 page

INTEGRATED CIRCUITS DIVISION

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R03

LIA120

Absolute Maximum Ratings are stress ratings. Stresses in

excess of these ratings can cause permanent damage to

the device. Functional operation of the device at conditions

beyond those indicated in the operational sections of this

data sheet is not implied.

Parameter

Conditions

Symbol

Min

Typ

Max

Units

Input Characteristics @ 25ºC

LED forward voltage

LED = 5 mA, VCOMP = VFB (Fig.1)

0.8

1.2

1.4

Reference voltage

LED = 10 mA, VCOMP = VFB (Fig.1)

A = -40 to +85°C

REF

1.210

1.265

A = 25°C

1.228

1.24

1.252

Deviation of V

REF over temperature - See Note 1

A = -40 to +85°C

REF (DEV)

-32

Transfer Characteristics @ 25ºC

Current Transfer Ratio in Feedback (I

REF/ILED)ILED = 5mA, VREF = 0.5V (Fig.2)

1.0

3.0

Current transfer ratio (I

KA/ILED)ILED = 5 mA, VCOMP = VFB, VKA = 5 V (Fig. 4)

1.0

3.0

Current Transfer Ratio Matching (I

KA/IREF)ILED = 5mA, VKA = 5.0V

100

115

Feedback input current

LED = 10 mA, R1 = 10 kΩ (Fig.2)

REF

226

µA

Deviation of I

REF over temperature - See Note 1

A = -40 to +85°C

REF (DEV)

110

µA

Minimum drive current

COMP = VFB (Fig.1)

LED (MIN)

Off-state error amplifier current

IN = 6 V, VFB = 0 (Fig.3)

OFF

0.001

0.1

µA

Error amplifier output impedance - See Note 2

LED = 0.1 mA to 15 mA, VCOMP = VFB, f<1 kHz (Fig.1)

OUTI

0.21



Output Characteristics @ 25ºC

Cathode dark current

IN = Open, VKA = 10V (Fig. 3)

KAO

0.3

100

Cathode-Anode voltage breakdown

KA = 1µA

Isolation Characteristics @ 25ºC

Withstand insulation voltage

≤ 50%, T

A = 25°C, t = 1 min (Note 3)

ISO

3750

rms

Resistance (input to output)

I-O = 500 VDC (Note 3)

I-O

-1012



AC Characteristics @ 25ºC

Bandwidth (LED) - See Note 4

-B

100

kHz

Common mode rejection ratio - See Note 5

LED = 1.0 mA, RL=100 kΩ, f=100 Hz (Fig. 5)

CMRR

Linearity

LED = 5 mA, 100 mVPP

THD

1. The deviation parameters V

REF(DEV) and IREF(DEV) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average

full-range temperature coefficient of the reference input voltage,

∆V

REF , is defined as:

∆V

REF| (ppm/°C) = {VREF (DEV)/VREF (TA 25°C)} X 10

6 /

∆T

where

∆T

A is the rated operating free-air temperature range of the device.

2. The dynamic impedance is defined as |Z

OUT| = ∆VCOMP/∆ILED, for the application circuit in Figure 6, |Zout| = K1R1

3. Device is considered as a two terminal device: Pins 1, 2, 3 and 4 are shorted together and Pins 5, 6, 7 and 8 are shorted together.

4. See compensation section for calculating bandwidth of LIA120.

5. Common mode transient immunity at output high is the maximum tolerable (positive) dVcm/dt on the leading edge of the common mode impulse signal, Vcm, to assure that the output will

remain high. Common mode transient immunity at output low is the maximum tolerable (negative) dVcm/dt on the trailing edge of the common pulse signal,Vcm, to assure that the output will

remain low.

Electrical Characteristics:

Parameter

Symbol

Ratings

Units

Photodiode Cathode-Anode Voltage

KAO

Photodiode Anode-Cathode Voltage

AKO

0.5

Input Voltage

LED

Input DC Current

LED

Total Power Dissipation (note 1)

145

Operating Temperature

-40 to +85

ºC

Storage Temperature

-40 to +125

ºC

Absolute Maximum Ratings (@ 25ºC)

1 Derate linearly from 25°C at a rate of 2.42 mW/ °C.

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