LIA130
Optically Isolated Error Amplifier
Features
• Optocoupler, Precision Reference, and Error
Amplifier in a Single Package
• 1.240V ± 1% Reference (@ 25ºC)
• Linear Optical Coupler Technology with an Industry
Standard 431-type
• CTR 300% to 600% Linearity
• 3750Vrms Isolation
Description
The LIA130 is an optically isolated amplifier with a
431-type precision programmable shunt reference
combined in the same package. The optocoupler
portion of the LIA130 comprises a Gallium Arsenide
(GaAs) light-emitting diode (LED) optically coupled to
a silicon phototransistor. The current transfer ratio of
the device is between 300% and 600%.
The combination of features in the LIA130 is optimal
for use in isolated AC-to-DC power supplies and
DC-to-DC converters. It replaces several discrete
components, saves valuable circuit board space, and
reduces complexity.
Applications
• Power System for Workstations
• Telecom Central Office Supply
• Telecom Bricks
The device is available in DIP and surface-mount
packages.
Block Diagram
NC
8 LED
1
C
2
7 FB
E
3
6 COMP
Approvals
• UL Recognized Component: File # E76270
• CSA Certified Component: Certificate # 1305490
Ordering Information
NC
Pb
DS-LIA130-R00C
5 GND
4
RoHS
2002/95/EC
Part #
LIA130
LIA130S
LIA130STR
Description
8 Pin DIP (50/Tube)
8-Pin Surface Mount (50/Tube)
8-Pin Surface Mount (1000/Reel)
e3
PRELIMINARY
1
LIA130
Absolute Maximum Ratings (@ 25˚ C)
Parameter
Collector-Emitter Voltage
Emitter-Collector Voltage
Input Voltage
Input DC Current
Collector Current
Input Power Dissipation 1
Transistor Power Dissipation 2
Total Power Dissipation 3
Storage Temperature
Operating Temperature
1
Symbol Ratings Units
VCEO
20
V
VECO
7
V
VLED
10
V
ILED
20
mA
IC
50
mA
PD
145
mW
PD
85
mW
PD
145
mW
-55 to +125
°C
TSTG
-40 to +85
°C
TOPR
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.
Derate linearly from 25°C at a rate of 2.42 mW/ °C.
Derate linearly from 25°C at a rate of 1.42 mW/ °C.
Derate linearly from 25°C at a rate of 2.42 mW/ °C.
2
3
Electrical Characteristics
Parameter
Input Characteristics @ 25°C
LED forward voltage
Reference voltage
1
Deviation of VREF over temperature
Ratio of VREF variation to the output of the error amplifier
Feedback input current
Deviation of IREF over temperature 1
Minimum drive current
Off-state error amplifier current
Error amplifier output impedance 2
Conditions
Symbol
Min
Typ
Max
Units
ILED = 5 mA, VCOMP = VFB (Fig.1)
VCOMP = VFB, ILED = 10 mA, -40 to +85°C (Fig.1)
VCOMP = VFB, ILED = 10 mA, 25°C (Fig.1)
TA = -40 to +85°C
VF
0.9
1.224
1.228
-
1.24
1.24
77
1.4
1.259
1.252
TBD
V
mV
-
0.002
TBD
mV/V
-
0.09
0.028
45
0.001
0.22
TBD
TBD
80
0.1
-
μA
μA
μA
μA
Ω
70
7
0.3
-
50
-
nA
V
V
VREF
ILED = 10 mA, R1 = 10 kΩ (Fig.3)
TA = -40 to +85°C
VCOMP = VFB (Fig.1)
VLED = 6 V, VFB = 0 (Fig.4)
VCOMP = VFB, ILED = 0.1 mA to 15 mA, f<1 kHZ
VREF (DEV)
ΔVREF/
ΔVCOMP
IREF
IREF (DEV)
ILED (MIN)
I (OFF)
IZOUTI
VCE = 10V (Fig. 5)
IC = 1.0mA
IE = 100 µA
ICEO
BVCEO
BVECO
ILED = 10 mA, VCOMP = VREF to 10 V (Fig.2)
V
Output Characteristics @ 25°C
Collector dark current
Collector-emitter voltage breakdown
Emitter-collector voltage breakdown
1. The deviation parameters VREF(DEV) and IREF(DEV) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average fullrange temperature coefficient of the reference input voltage, ΔVREF, is defined as:
|ΔVREF| (ppm/°C) = {VREF (DEV)/VREF (TA 25°C)} X 106 / ΔTA
where ΔTA is the rated operating free-air temperature range of the device.
2. The dynamic impedance is defined as |ZOUT| = ΔVCOMP/ΔILED. When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by:
|ZOUT, TOT| = ΔV/ΔI ≈ |ZOUT| X [1 + R1/R2]
2
PRELIMINARY
R00C
LIA130
Electrical Characteristics
Parameter
Transfer Characteristics @ 25°C
Current transfer ratio
Collector-emitter saturation voltage
Isolation Characteristics @ 25°C
Input-output insulation leakage current 1
Withstand insulation voltage 1
Resistance (input to output) 1
Switching Characteristics @ 25°C
Bandwidth
Common mode transient immunity at output high 2
Common mode transient immunity at output low 2
Conditions
Symbol
Min
Typ
Max
Units
ILED = 5 mA, VCOMP = VFB, VCE = 5 V (Fig. 6)
ILED = 10 mA, VCOMP = VFB, IC = 2.5 mA (Fig. 6)
CTR
VCE (SAT)
300
-
500
0.099
600
0.5
%
V
RH = 45%, TA = 25°C, t = 5s, VI-O = 3000 VDC
RH <= 50%, TA = 25°C, t = 1 min
VI-O = 500 VDC
II-O
VISO
RI-O
2500
-
1012
1.0
-
μA
Vrms
Ω
(Fig. 7)
ILED = 0 mA, Vcm = 10 VPP RL = 2.2 kΩ (Fig. 8)
ILED = 10 mA, Vcm = 10 VPP RL = 2.2 kΩ (Fig. 8)
BW
|CMH|
|CML|
-
10
TBD
TBD
-
kHZ
kV/μs
kV/μs
1. 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.
2. 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.
Example Application for the LIA130
VOUT
VIN
PWM
Control
LIA130
R00C
1
8
2
7
3
6
4
5
PRELIMINARY
R1
R2
3
LIA130
Test Circuits
ILED
IREF
8
2
6
3
IOFF
VLED
8
2
6
3
+
+
7
7
5
5
IREF Test Circuit
8
IOFF Test Circuit
ICEO
2
VCE
6
ILED
2
8
+
IC
VCE
3
3
6
+
+
VCOMP
7
7
VREF
5
5
ICEO Test Circuit
ILED
CTR, VCE-sat Test Circuit
8
2
6
3
ILED
8
2
6
3
VF
+
VCOMP
+
7
VREF
7
VREF
5
VREF, VF, ILED-min Test Circuit
4
5
ΔVREF / ΔVCOMP Test Circuit
PRELIMINARY
R00C
LIA130
Test Circuits (cont.)
VCC = +5VDC
IF = 10 mA
RL
1
47Ω
8
1μf
VOUT
2
7
VIN
0.47V
0.1 VPP
3
6
4
5
Frequency Response
VCC = +5VDC
IF = 0 mA (A)
IF = 10 mA (B)
R1
2.2kΩ
VOUT
1
8
2
7
3
6
4
5
A B
VCM
_
+
10VP-P
CMH and CML
R00C
PRELIMINARY
5
LIA130
PERFORMANCE DATA*
ILED - Supply Current (µA)
10
5
0
-5
-10
-15
-1.0
-0.5
0.0
0.5
1.0
1.5
150
120
90
60
30
0
-30
-60
-90
-120
-150
-1.0
100
90
80
70
60
0.0
0.5
1.0
0
20
40
60
Temperature (ºC)
80
-40
LIA130
Off Current vs. Ambient Temperature
(VLED=13.2V, VFB=0V)
0.4
0.3
0.2
0.1
100
IC - Collector Current (mA)
10
0
0
20
40
60
Temperature (ºC)
20
40
60
80
80
100
60
80
20
85ºC
55ºC
25ºC
-5ºC
15
10
5
100
100
ILED=20mA
80
60
ILED=10mA
40
ILED=5mA
20
0
-20
0
120
20
-40
-20
LIA130
Collector Current vs. Ambient Temperature
(VCE=5V)
30
0
20
40
Temperature (ºC)
LIA130
LED Forward Current vs. Forward Voltage
0.8
Temperature (ºC)
40
-10
-20
0
-40
LIA130
Dark Current vs. Temperature
(VCE=10V)
50
ILED=10mA
1.31
1.5
0
-20
1.34
ILED - Forward Current (mA)
0.5
I(OFF) - Off Current (nA)
IREF - Reference Current (mA)
110
-40
1.37
VCOMP - Cathode Voltage (V)
LIA130
Reference Current vs. Ambient Temperature
(ILED=10mA, R1=10KΩ)
ICEO - Dark Current (nA)
1.40
1.28
-0.5
VCOMP - Cathode Voltage (V)
50
LIA130
Reference Voltage vs.
Ambient Temperature
ILED=1mA
-40
-20
0
20
40
60
Temperature (ºC)
80
100
(IC/IF) - Current Transfer Ratio (%)
ILED - Supply Current (mA)
15
LIA130
LED Current vs. Cathode Voltage
(TA=25ºC, VCOMP=VFB)
VREF - Reference Voltage (V)
LIA130
LED Current vs. Cathode Voltage
(TA=25ºC, VCOMP=VFB)
700
0.9
1.0 1.1 1.2 1.3 1.4
VF - Forward-Voltage (V)
1.5
1.6
LIA130
Current Transfer Ratio vs LED Current
(VCE=5V)
600
500
-5ºC
25ºC
55ºC
85ºC
400
300
200
100
0
0
5
10
15
20
ILED - Forward Current (mA)
25
*The Performance data shown in the graphs above is typical of device performance. For guaranteed parameters not indicated in the written specifications, please
contact our application department.
6
PRELIMINARY
R00C
LIA130
PERFORMANCE DATA*
0.25
0.20
0.15
0.10
0.05
0.00
180
-40
-20
0
20
40
60
80
160
140
ILED=20mA
120
100
80
ILED=10mA
60
ILED=5mA
40
ILED=1mA
20
0
100
LIA130
Delta VREF / Delta VCOMP
vs. Ambient Temperature
LIA130
Collector Current vs. Collector Voltage
(TA=25ºC)
0
Temperature (ºC)
1
2
3
4
5
6
7
8
VCE - Collector-Emitter (V)
9
10
VCE (sat) - Saturation Voltage (V)
0.30
IC - Collector Current (mA)
VCE (sat) - Saturation Voltage (V)
LIA130
Saturation Voltage vs. Ambient Temperature
(ILED=10mA; IC=10mA)
-1.5
-2.0
-2.5
-3.0
-40
-20
0
20
40
60
Temperature (ºC)
80
100
LIA130
Voltage Gain vs. Frequency
Voltage Gain, A(Vo/Vin) dB
15
0
100Ω
-15
500Ω
1kΩ
-30
10
100
Frenquency kHz
1000
*The Performance data shown in the graphs above is typical of device performance. For guaranteed parameters not indicated in the written specifications, please
contact our application department.
R00C
PRELIMINARY
7
LIA130
The LIA130
The LIA130 is essentially an optically isolated
error amplifier. It comprises three of the necessary
components to form an isolated power supply: an
optocoupler, an error amplifier, and a reference
voltage device. The LIA130 is the functional equivalent
of a 431 series shunt voltage regulator plus an
optocoupler in the same package.
LED Pin
The LED within the LIA130 is powered by a sample of
the output voltage that is being regulated. Typically, a
resistor divider is provided to keep this voltage sample
within the operating range of the LED and its series
resistor. As the output voltage changes, the LED light
output changes, which provides a changing error
voltage from the phototransistor output of the LIA130.
The sampled voltage must be at least 1.24V (the
reference voltage) plus 1.5V (the LED voltage drop)
or a minimum of 2.74 volts. The sampled voltage can
also be provided from a slaved secondary winding of
the transformer rather than a resistor divider.
There must be a current-limiting resistor in series with
the LED pin to keep the current flow through the LED
within its operating range for all expected sampled
output levels. This resistor must be selected along with
the resistor in series with the output phototransistor.
FB Pin
The LIA130, when connected as shown in the Typical
Application Circuit, will regulate the output voltage so
that the voltage on its FB pin is 1.24V. Set the values
of the two voltage divider resistors, R1 and R2 in this
way:
R1/R2 = (VOUT / VREF) - 1
The value of R1 is set by the input offset current,
0.8μA. 1% accuracy is obtained when the value of R1
satisfies this formula:
COMP Pin
The frequency response of the converter can be
optimized for the particular application by placing a
compensation network between the COMP pin and
the FB pin of the LIA130. In a system with a typical
low-bandwidth requirement, only a 0.1µF capacitor
might be needed.
If the system has more critical bandwidth
requirements, then measurements must be made of
the system's loop. See “Practical Design of Power
Supplies” by Ron Lenk, IEEE Press, 1998, for an
excellent description.
C & E Pins
The output phototransistor of the LIA130 provides the
isolated and amplified error signal that represents the
DC output level of the converter. Typically, the collector
of the phototransistor will be pulled up to voltage and
the emitter will be grounded.
The value of the collector's pull-up resistor and the
value of the LED current-limiting resistor must be
determined together with respect to the input voltage
range of the PWM circuitry. The variation in CTR of
the LIA130 must also be taken into account.
As an example, consider first that the minimum CTR
of the LIA130 is 300%. If the current-limiting resistor
of the LED is set to allow a maximum current through
the LED of 1mA when the converter output is at a
nominal 15 volts:
RLED = (15V - 2.74V) / 0.001A = 12.260kΩ
then a minimum of 3mA will flow through the collector
pull-up resistor. If the collector is pulled up to 12V and
the PWM has an internal reference voltage of 5V, then
the minimum resistor value is:
RPULLUP > (12V - 5V) / 0.003A > 2.333kΩ
((VOUT - 1.24) / R1) > 80µA
GND Pin
Connect the GND pin of the LIA130 to the secondary
ground of the converter.
[Standard values can be selected for RLED and
RPULLUP and the small differences then re-calculated.]
NC Pins
The NC (not connected) pins have no internal
connection and must not have any connection to
the secondary side, as this might compromise the
primary-to-secondary isolation.
8
PRELIMINARY
R00C
LIA130
MANUFACTURING INFORMATION
Soldering
For proper assembly, the component must be
processed in accordance with the current revision
of IPC/JEDEC standard J-STD-020. Failure to
follow the recommended guidelines may cause
permanent damage to the device resulting in impaired
performance and/or a reduced lifetime expectancy.
Washing
Clare does not recommend ultrasonic cleaning or the
use of chlorinated solvents.
Pb
RoHS
2002/95/EC
e3
MECHANICAL DIMENSIONS
8-Pin DIP Through-Hole Package
2.540 ± 0.127
(0.100 ± 0.005)
PC Board Pattern
9.652 ± 0.381
(0.380 ± 0.015)
8-0.800 DIA.
(8-0.031 DIA.)
7.620 ± 0.254
(0.300 ± 0.010)
9.144 ± 0.508
(0.360 ± 0.020)
6.350 ± 0.127
(0.250 ± 0.005)
0.457 ± 0.076
(0.018 ± 0.003)
3.302 ± 0.051
(0.130 ± 0.002)
6.350 ± 0.127
(0.250 ± 0.005)
7.620 ± 0.127
(0.300 ± 0.005)
7.239 TYP.
(0.285)
0.254 TYP
(0.01)
4.064 TYP
(0.160)
2.540 ± 0.127
(0.100 ± 0.005)
7.620 ± 0.127
(0.300 ± 0.005)
Dimensions
mm
(inches)
0.889 ± 0.102
(0.035 ± 0.004)
Recommended PCB Land Pattern
8-Pin Surface Mount Package
9.652 ± 0.381
(0.380 ± 0.015)
2.540 ± 0.127
(0.100 ± 0.005)
6.350 ± 0.127
(0.250 ± 0.005)
9.525 ± 0.254
(0.375 ± 0.010)
0.457 ± 0.076
(0.018 ± 0.003)
2.54
(0.10)
0.635 ± 0.127
(0.025 ± 0.005)
3.302 ± 0.051
(0.130 ± 0.002)
8.90
(0.3503)
1.65
(0.0649)
7.620 ± 0.254
(0.300 ± 0.010)
0.254 ± 0.127
(0.010 ± 0.0005)
0.65
(0.0255)
4.445 ± 0.127
(0.175 ± 0.005)
Dimensions
mm
(inches)
0.813 ± 0.120
(0.032 ± 0.004)
R00C
PRELIMINARY
9
LIA130
MECHANICAL DIMENSIONS (Cont.)
Tape and Reel Packaging for 8-Pin Surface Mount Package
W = 16.30 max
(0.642 max)
330.2 DIA.
(13.00 DIA.)
Top Cover
Tape Thickness
0.102 MAX.
(0.004 MAX.)
1
8
Top Cover
Tape
K0 = 4.90
(0.193)
K1 = 4.20
(0.165)
Embossed Carrier
Embossment
P = 12.00
(0.472)
User Direction of Feed
Ao = 10.30
(0.406)
Bo = 10.30
(0.406)
Dimensions
mm
(inches)
NOTE: Tape dimensions not shown comply with JEDEC Standard EIA-481-2
For additional information please visit our website at: www.clare.com
Clare, Inc. makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications
and product descriptions at any time without notice. Neither circuit patent licenses nor indemnity are expressed or implied. Except as set forth in Clare’s Standard Terms and Conditions of
Sale, Clare, Inc. assumes no liability whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability,
fitness for a particular purpose, or infringement of any intellectual property right.
The products described in this document are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other
applications intended to support or sustain life, or where malfunction of Clare’s product may result in direct physical harm, injury, or death to a person or severe property or environmental
damage. Clare, Inc. reserves the right to discontinue or make changes to its products at any time without notice.
10
PRELIMINARY
Specification: DS-LIA130-R00C
©Copyright 2009, Clare, Inc.
All rights reserved. Printed in USA.
11/17/09