I
NTEGRATED
C
IRCUITS
D
IVISION
Features
•
Low Input Voltage of 1.6V over temperature
•
Precision reference, error amplifier, and optocoupler
in a single package
•
Voltage Reference: 1.299V ±0.5% @ 25°C
LIA135: ±1% @ -40°C to +85°C
LIA136: ±1.5% @ -40°C to +110°C
•
LIA136: Reduced dark current at high temperature
•
Common Mode Transient Immunity:
LIA135: 5V/ns
LIA136: 20V/ns
•
Simplified frequency compensation
•
CTR 500% to 2000%
•
Lowest optical offset current (I
CE
vs. V
LED
)
Low Voltage Optically Isolated
Error Amplifiers
Description
The LIA135 and LIA136 are low voltage optically
isolated error amplifiers with a precision
programmable shunt reference combined into a single
package capable of operating down to 1.6V. The
optocoupler portion of the LIA135 / LIA136 comprises
an infrared LED that is optically coupled to an NPN
phototransistor providing a current transfer ratio from
500% to 2000%. Ensuring low voltage performance,
the input voltage range of 1.6V to 10V is guaranteed
over the operational temperature range.
LIA135 / LIA136
Applications
•
•
•
•
Low Voltage Power Supply Feedback
Isolated Power Supply Feedback
AC-to DC Power Supplies
DC-to-DC Converters
The combination of features in the LIA135 / LIA136
are optimal for use in isolated AC-to-DC power
supplies and DC-to-DC converters. The bias current
for the shunt regulator does not pass through the LED,
which eliminates bias-related optical current, giving
the user the industry’s largest dynamic range (1000:1).
These devices are available in DIP and surface mount
(SMT) packages.
Approvals
•
UL Recognized Component: File # E76270
•
CSA Certified Component: Certificate # 1305490
Ordering Information
Part
LIA135
LIA135S
LIA135STR
LIA136
LIA136S
LIA136STR
Description
8-pin DIP, Tube (50/Tube)
8-pin Surface Mount, Tube (50/Tube)
8-pin Surface Mount, Tape & Reel (1000/Reel)
8-pin DIP, Tube (50/Tube)
8-pin Surface Mount, Tube (50/Tube)
8-pin Surface Mount, Tape & Reel (1000/Reel)
LIA135 and LIA136 Block Diagrams
LED
COMP
FB
LED
C
COMP
FB
+
_
+
_
+
_
+
_
GND
GND
LIA135
DS-LIA135 / LIA136-R01
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LIA136
1
E
B
C
E
I
NTEGRATED
C
IRCUITS
D
IVISION
LIA135 / LIA136
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
1.3
1.4
1.5
1.6
Package Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
3
3
4
5
7
2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1
2.2
2.3
2.4
2.5
Input Side Biasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optocoupler Output Transistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N/C Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
9
9
9
9
3. Design Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Error Amplifier Input Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Discrete Optocoupler Output Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Integrated Optocoupler Output Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. Manufacturing Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1
4.2
4.3
4.4
4.5
Moisture Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ESD Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Soldering Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Board Wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
11
11
11
12
2
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I
NTEGRATED
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IVISION
LIA135 / LIA13
1. Specifications
1.1 Package Pinout
1.2 Pin Description
Pin#
1
1
2
3
4
8
7
6
5
Name
N/C
N/C
B
C
E
LED
COMP
GND
FB
Description
No Connect - not used
LIA135: No Connect - not used
LIA136: Phototransistor Base
Phototransistor Collector
Phototransistor Emitter
LED Anode and Input Side Power
Error Amplifier Compensation
(Error amplifier output)
Ground (Secondary side of supply)
Feedback Input
(Error Amplifier Input / Summing node)
2
3
4
5
6
7
8
1.3 Absolute Maximum Ratings
Parameter
Collector-Emitter Voltage
Emitter-Collector Voltage
Collector Current
Input Voltage (Referenced to GND)
Input DC Current
Input Power Dissipation
1
Transistor Power Dissipation
2
Total Power Dissipation
1
Isolation Voltage, Input Side to Output Side
Operating Temperature:
LIA135
LIA136
Storage Temperature
1
2
Symbol
V
CEO
V
ECO
I
CE
V
LED
I
LED
P
D(IN)
P
D(NPN)
P
D
V
IO
T
A
T
STG
Ratings
25
7
50
15
20
145
85
145
3750
-40 to +85
-40 to +110
-55 to +125
Unit
V
V
mA
V
mA
mW
mW
mW
V
rms
°C
°C
°C
Derate linearly from 25°C at a rate of 2.42mW/°C.
Derate linearly from 25°C at a rate of 1.42mW/°C.
Unless otherwise specified, Absolute Maximum ratings are at 25°C. 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
these or any other conditions beyond those indicated in the operational sections of this data sheet is not implied.
Typical values are characteristic of the device at 25°C, and are the result of engineering evaluations. They are
provided for information purposes only, and are not part of the manufacturing testing requirements.
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NTEGRATED
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IVISION
1.4 Electrical Characteristics
Parameter
Input voltage
LED forward voltage
Reference voltage
1
LIA135 / LIA136
Symbol
V
LED
V
F
V
REF
LIA135:
LIA136:
Conditions
T
A
=-40°C to +85°C
T
A
=-40°C to +110°C
V
FB
=V
COMP
=GND, I
LED
=5mA (Fig. 1)
V
LED
=1.6V, I
LED
=10mA (Fig. 2)
T
A
=25°C
LIA135:
T
A
=-40°C to +85°C
LIA136:
T
A
=-40°C to +110°C
V
LED
=1.6V, I
LED
=10mA, (Fig. 2)
LIA135:
T
A
=-40°C to +85°C
LIA136:
T
A
=-40°C to +110°C
1.6V
<
V
LED
<
10V, I
LED
=10mA (Fig. 2)
V
LED
=1.6V, I
LED
=10mA (Fig. 2)
V
LED
=1.6V, I
LED
=10mA, (Fig. 2)
Min
Typ
Max
Unit
Input Characteristics @ 25°C (Unless Otherwise Specified)
1.6
0.9
1.293
1.286
1.280
-
-
-
0.1
-
-
-
-
-
20
7
500
-
-
-
1.299
1.299
1.299
3
6
-0.37
0.34
0.35
0.4
75
0.001
1
0.3
-
-
-
10
0.099
1
1
-
-
10
1.4
1.305
1.312
1.318
12
21
-2.7
0.5
0.55
0.6
100
0.1
-
50
-
-
2000
-
0.5
10
10
-
-
V
V
V
Deviation of V
REF
over temperature
2
V
REF(DEV)
mV
mV/V
A
A
A
A
S
nA
V
V
%
kHz
V
A
Ratio of V
REF
variation to V
LED
change
FB input bias current
Deviation of I
IB
over temperature
2
V
REF
/V
LED
I
IB
I
IB(DEV)
Quiescent bias current
Error amplifier Off-State current
Shunt transconductance
3
Collector dark current
Collector-emitter breakdown voltage
Emitter-collector breakdown voltage
Current transfer ratio
Bandwidth
Collector-emitter saturation voltage
Minimal Operating Point Output Current
4
LIA135:
T
A
=-40°C to +85°C
LIA136:
T
A
=-40°C to +110°C
V
LED
=1.6V, V
FB
< V
REF,
I
F
=0mA (Fig. 5)
I
Q
I
LED(off)
V
LED
=10V, V
FB
=0V (Fig. 3)
g
m
(I
LED
/V
FB
) V
LED
=1.6V, I
LED
= 0.2mA to 10mA @ f=1kHz (Fig. 2)
I
CE
BV
CEO
BV
ECO
CTR
B
W
V
CE(sat)
I
C(min)
V
CE
=10V, R
B
=1M (Fig. 4)
I
C
=1mA
I
E
=100A
I
LED
=5mA, V
CE
=5V, R
B
=1M (Fig. 5)
(Fig. 7)
I
LED
=10mA, I
C
=2.5mA, R
B
=1M (Fig. 5)
V
LED
=10V (Fig. 6)
LIA135: V
FB
=1.258V, T
A
= -40°C to +85°C
LIA136: V
FB
=1.252V, R
B
=1M, T
A
= -40°C to +110°C
V
LED
=1.6V, (Fig. 6)
LIA135: V
FB
=1.307V, T
A
= -40°C to +85°C
LIA136: V
FB
=1.313V, R
B
=1M, T
A
= -40°C to +110°C
I
LED
=0mA, V
CM
=10V
PP
, R
C
=2.2k (Fig. 8)
LIA135:
LIA136:
R
B
=1M, C
B
=100pF
I
LED
=10mA, V
CM
=10V
PP
, R
C
=2.2k (Fig. 8)
LIA135:
LIA136:
R
B
=1M, C
B
=100pF
Output Characteristics @ 25°C (Unless Otherwise Specified)
Transfer Characteristics @ 25°C (Unless Otherwise Specified)
-
-
10
10
Full-on Operating Point Output Current
4
I
C(on)
mA
Common Mode Transient Immunity Characteristics @ 25°C (Unless Otherwise Specified)
Output = High
5
|CM
H
|
-
-
-
-
5
20
5
20
-
-
-
-
V/ns
Output = Low
5
|CM
L
|
V/ns
1 Reference voltage measured at Pin FB under the specified conditions.
2 Deviation parameters VREF(DEV) and IIB(DEV) are defined as the difference between the minimum and maximum values obtained over the rated temperature range.
3 With two external resistors, the total shunt transconductance of the circuit is defined as:
R2
g
=
g
m
----------------------
m
R1 + R2
4 See
Figure 9: Operational Template on page 6.
5 Common mode transient immunity at Output = High is the maximum positive dVcm/dt on the rising edge of the common mode impulse signal, Vcm, to ensure the
output will remain high. Common mode transient immunity at Output = Low is the maximum negative dVcm/dt on the falling edge of the common pulse signal, Vcm,
to ensure the output will remain low.
4
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1.5 Test Diagrams
Figure 1: V
F
Test Circuit
C
LED
E
LIA136
only
B
LIA135 / LIA13
Figure 2: V
REF
, I
IB
,
V
REF
/V
LED
, g
m
, Test Circuit
I
LED
C
LED
E
LIA136
only
B
COMP
R1
I
LED
V
F
COMP
V
LED
+
_
+
_
FB
GND
Figure 3: I
LED(off)
Test Circuit
C
LED
I
LED(off)
+
E
LIA136
only
B
COMP
+
_
+
_
FB
GND
Figure 5: CTR, V
CE(sat),
Bias Current Test Circuit
I
C
C
I
LED
+
V
CE
E
LIA136
only
I
F
I
Q
COMP
R
B
R
B
B
B
+
_
V
FB
GND
+
_
GND
R01
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+
+
_
FB
+
+
_
FB
V
FB
+
+
LED
+
V
LED
+
I
IB
+
+
_
+
_
FB
V
REF
GND
R2
Figure 4: I
CE
Test Circuit
I
CE
V
CE
C
LED
E
LIA136
only
COMP
R
B
B
+
_
+
_
FB
GND
Figure 6: I
C(min)
, I
C(on)
Test Circuit
I
C
V
CE
C
LED
E
LIA136
only
COMP
V
LED
5
