SUTEX LR8 High input voltage adjustable 3-terminal linear regulator Datasheet

LR8
High Input Voltage
Adjustable 3-Terminal Linear Regulator
Features
General Description
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The Supertex LR8 is a high voltage, low output current,
adjustable linear regulator. It has a wide operating input
voltage range of 13.2V to 450V. The output voltage can be
adjusted from 1.20V to 440V provided that the input voltage
is at least 12V greater than the output voltage. The output
voltage can be adjusted by means of two external resistors
R1 and R2 as shown in the typical application circuits. The
LR8 regulates the voltage difference between VOUT and ADJ
pins to a nominal value of 1.20V. The 1.20V is amplified by
the external resistor ratio R1 and R2. An internal constant bias
current of typically 10µA is connected to the ADJ pin. This
increases VOUT by a constant voltage of 10µA times R2.
13.2V to 450V input voltage range
Adjustable 1.20V to 440V output regulation
5% output voltage tolerance
Output current limiting
10µA typical ADJ current
Internal junction temperature limiting
Applications
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Off-line SMPS startup circuits
Adjustable high voltage constant current source
Industrial controls
Motor controls
Battery chargers
Power supplies
The LR8 has current limiting and temperature limiting. The
output current limit is typically 20mA and the minimum
temperature limit is 125°C. An output short circuit current will
therefore be limited to 20mA. When the junction temperature
reaches its temperature limit, the output current and/or output
voltage will decrease to keep the junction temperature from
exceeding its temperature limit. For SMPS start-up circuit
applications, the LR8 turns off when an external voltage
greater than the output voltage of the LR8 is applied to VOUT
of the LR8. To maintain stability, a bypass capacitor of 1.0µF
or larger and a minimum DC output current of 500µA are
required.
The device is available in TO-243AA (SOT-89), TO-252 (DPAK), and TO-92 packages.
Typical Application Circuit
*
VOUT
VIN
VIN
VOUT
ADJ
LR8
R1
C2
C1
R2
*Required for conditions where VIN is less than VOUT.
RLOAD
LR8
Ordering Information
DEVICE
LR8
Package Option
TO-243AA
TO-252
TO-92
LR8N8-G
LR8K4-G
LR8N3-G
-G indicates package is RoHS compliant (‘Green’)
Pin Configurations
Absolute Maximum Ratings
VOUT
VOUT
Parameter
Value
VIN input voltage (voltages ref to ADJ)
-0.5V to +480V
Output voltage range
-0.5V to +470V
Operating ambient temperature range
-40°C to +85°C
Operating junction temperature range
-40°C to +125°C
Storage temperature range
-65°C to +150°C
VIN
ADJ
VOUT
VIN
ADJ
VIN
TO-243AA (SOT-89) TO-252 (D-PAK)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those indicated in the operational sections
of the specifications is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
(top view)
(top view)
VOUT
ADJ
TO-92
(front view)
Product Marking
Product marking for TO-243AA:
LR8
where
Electrical Characteristics (Test conditions unless otherwise specified:
Symbol
Parameter
VIN - VOUT
= 2-week alpha date code
-40°C < TA < 85°C.)
Min
Typ
Max
Input to output voltage difference
12
-
450
V
---
VOUT
Overall output voltage regulation
1.14
1.20
1.26
V
13.2V < VIN< 400V,
R1 = 2.4KΩ, R2 = 0
VOUT
Overall output voltage regulation
375
400
425
V
R1 = 2.4KΩ, R2 = 782KΩ
ΔVOUT
Line regulation
-
0.003
0.01
%/V
ΔVOUT
Load regulation
-
1.4
3.0
%
VIN = 17V, VOUT = 5V,
0.5mA <IOUT< 10mA
ΔVOUT
Temperature regulation
-1
-
+1
%
VIN = 17V, VOUT = 5V, IOUT = 10mA,
-40°C < TA < 85°C
IOUT
Output current limit
10
-
30
mA
TJ < 85°C, VIN - VOUT = 12V
IOUT
Output current limit
-
-
0.5
mA
TJ > 125°C, VIN - VOUT = 450V
IOUT
Minimum output current
-
0.3
0.5
mA
Includes R1 and load current
IADJ
Adjust output current
5
10
15
µA
---
C2
Minimum output load capacitance
1
-
-
µF
---
DVOUT/DVIN
Ripple rejection ratio
50
60
-
dB
120Hz, VOUT = 5V
TLIMIT
Junction temperature limit
125
-
-
°C
---
2
Units Conditions
17V < VIN< 400V, VOUT = 5V,
IOUT = 0.5mA
LR8
Thermal Characteristics
Power Dissipation
@ TA = 25°C
θJC
°C/W
θJA
°C/W
TO-92
0.74W
125
170
TO-243AA
1.6W
15
78†
TO-252
2.5W
6.25
50†
Package
†Mounted on FR4 board, 25mm x 25mm x 1.57mm.
Significant PD increase possible on ceramic substrate.
Functional Block Diagram
VIN
LR8
Pass
Element
Overtemp &
Overcurrent
1.2V
VOUT
10µA
ADJ
Typical Application Circuits
Figure 1: High Input Voltage, 5.0V Output Linear Regulator
*
VOUT = 5.0V
VIN = 17V to 450V
VIN
VOUT
ADJ
LR8
R1
6.04KΩ
1%
C1
R2
18.2KΩ
1%
* Required for conditions where VIN is less than VOUT
3
C2
1.0µF
RLOAD ≤16.5KΩ
R2
VOUT = 1.20V 1+
R1
+ IADJ R2
LR8
Typical Application Circuits
Figure 2: SMPS Start-Up Circuit
VIN = (VOUT + 12V) to 450V
+
VAUXILIARY
VOUT1
-
VIN
VOUT
+
ADJ
VOUT2
LR8
VCC
FB
PWM IC
Figure 3: High Voltage Adjustable Constant Current Source
IOUT =
R
+
VIN
1.20V
R
VOUT
ADJ
VIN = (VOUT + 12V) to 450V
LR8
LOAD
1.0µF
-
4
LR8
Typical Performance Curves
Temperature Variation
1.30
VIN
1.25
VOUT = 1.2V
VOUT (V)
LR8
ADJ
12V
2.4KΩ
1.0µF
1.20
1.15
1.10
1.05
1.00
-50
-25
0
25
50
75
100
125
100
125
T(junction) ( OC)
Adjustment Current
12
11
VOUT = 1.2V
IADJ (µA)
VIN
LR8
12V,
200V,
400V
ADJ
2.4KΩ
10
VIN = 400V
VIN = 12V
9
1.0ΩF
I
8
ADJ
VIN = 200V
7
6
-50
-25
0
25
50
75
T(junction) (OC)
Load Regulation
5.2
V
V
IN
OUT
= 5.0V
IOUT
LR8
5.1
ADJ
25V
1.0µF
VOUT (V)
6.04KΩ
±1%
5.0
RLOAD
18.2KΩ
±1%
4.9
4.8
0
2
4
6
IOUT (mA)
5
8
10
LR8
Typical Performance Curves (cont.)
VOUT vs. VIN
6
VOUT = 5.0V
VIN
5
VOUT (V)
LR8
6.04KΩ
±1%
ADJ
1.0µF
0V to 50V
1KΩ
18.2KΩ
±1%
4
3
2
1
0
0
10
20
30
40
50
8
10
VIN (V)
Ripple Rejection
VIN
20VP-P
@ 60Hz
LR8
VOUT = 5.0V
ADJ
Ripple Rejection Ratio (dB)
-65
IOUT
6.04KΩ
±1%
1.0µF
RLOAD
18.2KΩ
±1%
-63
-62
-61
-60
0
2
4
6
I OUT (mA)
30
25
l c l (m A )
65V
-64
20
15
10
-40
-20
0
20
40
Temperature (°C)
6
60
80
100
LR8
Typical Performance Curves (cont.)
LR8
±
Ω
Ω
±
Ω
Ω
Load Transient Response
LR8
±
Ω
Ω
±
Ω
Line Transient Response
Line Power Up Transient
Line Power Down Transient
7
LR8
3-Lead TO-243AA (SOT-89) Package Outline (N8)
4.50 ± 0.10
1.50 ± 0.10
0.40 ± 0.05
1.72 ± 0.10
Exclusion Zone
No Vias/Traces in
this area. Shape
of pad may vary.
4.10 ± 0.15
2.21 ± 0.08
2.45 ± 0.15
1.05 ± 0.15
0.5 ± 0.06
0.42 ± 0.06
1.50 BSC
3.00 BSC
Top View
Bottom View
Side View
Notes:
All dimensions are in millimeters; all angles in degrees.
3-Lead TO-252 (D-PAK) Package Outline (K4)
0.250 - 0.265
0.086 - 0.094
0.195 -0.215
0.035 - 0.050
0.018 - 0.035
4
0O - 15O
0.370 - 0.410
0.240 ± 0.005
0.005 MAX
0.040 MAX
1
2
3
0.047 - 0.070
0.108 REF
0.030 - 0.045
0O - 10O
0.090 BSC
0.025 - 0.035
0.018 - 0.024
0.170 MIN
0.20 BSC
Cutouts may not
be present
4
0.205 MIN
Notes:
All dimensions in inches; angles in degrees
3
2
1
8
LR8
3-Lead TO-92 Package Outline (N3)
0.135 MIN
0.125 - 0.165
0.080 - 0.105
1
2
3
Top View
0.175 - 0.205
0.170 - 0.210
Seating Plane
1 2 3
0.500 MIN
0.014 - 0.022
0.014 - 0.022
0.045 - 0.055
0.095 - 0.105
Front View
Side View
Notes:
All dimensions are in millimeters; all angles in degrees.
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline
information go to http://www.supertex.com/packaging.html.)
Doc.# DSFP-LR8
A121806
9
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