Supertex LR8K4-G Datasheet

Supertex inc.

Adjustable 3-Terminal Linear Regulator

LR8

High Input Voltage,

Features

► 13.2 - 450V input voltage range ► Adjustable 1.20 - 440V output regulation ► 5% output voltage tolerance ► Output current limiting ► 10µA typical ADJ current ► Internal junction temperature limiting

Applications

► Off-line SMPS startup circuits ► Adjustable high voltage constant current source ► Industrial controls ► Motor controls ► Battery chargers ► Power supplies

General Description

The Supertex LR8 is a high voltage, low output current, adjustable linear regulator. It has a wide operating input voltage range of

13.2 - 450V. The output voltage can be adjusted from 1.20 - 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 amplied

by the external resistor ratio R1 and R2. An internal constant bias current of typically 10µA is connected to the ADJ pin. This increases V

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.

by a constant voltage of 10µA times R2.

OUT

Typical Application Circuit

V

IN

C

1

* Required for conditions where VIN is less than V

VIN

LR8

The device is available in TO-243AA (SOT-89), TO-252 (D-PAK), and TO-92 packages.

*

V

OUT

VOUT

ADJ

R

2

R

1

C

OUT

2

R

LOAD

.

Doc.# DSFP-LR8 B080113

Supertex inc.

www.supertex.com

LR8

VOUT

Ordering Information

Part Number Package Options Packing

LR8K4-G TO-252 (D-PAK) 2000/Reel

LR8N3-G TO-92 1000/Bag

LR8N3-G P002 TO-92 2000/Reel

LR8N3-G P003 TO-92 2000/Reel

LR8N3-G P005 TO-92 2000/Reel

LR8N3-G P013 TO-92 2000/Reel

LR8N3-G P014 TO-92 2000/Reel

LR8N8-G TO-243AA (SOT-89) 2000/Reel

-G denotes a lead (Pb)-free / RoHS compliant package

Absolute Maximum Ratings

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

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 specications is not implied. Exposure to absolute maximum rating conditions for

extended periods may affect device reliability.

Typical Thermal Resistance

Package θ

TO-252 (D-PAK) 81OC/W

TO-92 132OC/W

TO-243AA (SOT-89) 133OC/W

ja

Pin Conguration

ADJ

VIN

ADJ

TO-92TO-252 (D-PAK)

VOUT

ADJ

VOUT

VIN

TO-243AA (SOT-89)

Product Marking

Si YYWW

LR8K4

LLLLLLL

Package may or may not include the following marks: Si or

SiLR

8

YWLL

Package may or may not include the following marks: Si or

LR8W

Package may or may not include the following marks: Si or

TO-243AA (SOT-89)

YY = Year Sealed WW = Week Sealed L = Lot Number = “Green” Packaging

TO-252 (D-PAK)

Y = Last Digit of Year Sealed W = Code for Week Sealed L = Lot Number = “Green” Packaging

TO-92

W = Code for Week Sealed = “Green” Packaging

Electrical Characteristics

(Test conditions unless otherwise specied: -40°C < TA < 85°C.)

Sym Parameter Min Typ Max Units Conditions

VIN - V

V

OUT

ΔV

OUT

ΔV

OUT

ΔV

OUT

I

OUT

Doc.# DSFP-LR8 B080113

Input to output voltage difference 12 - 450 V ---

OUT

1.14 1.20 1.26 V

Overall output voltage regulation

375 400 425 V R

Line regulation - 0.003 0.01 %/V

Load regulation - 1.4 3.0 %

Temperature regulation -1 - +1 %

10 - 30 mA TJ < 85°C, VIN - V

Output current limit

- - 0.5 mA TJ > 125°C, VIN - V

2

13.2V < VIN< 400V, R1 = 2.4kΩ, R2 = 0

17V < VIN< 400V, V I

OUT

VIN = 17V, V

0.5mA <I

VIN = 17V, V

-40°C < TA < 85°C

= 2.4kΩ, R2 = 782kΩ

1

OUT

= 0.5mA

= 5V,

OUT

< 10mA

OUT

= 5V, I

OUT

= 12V

OUT

Supertex inc.

www.supertex.com

= 5V,

= 10mA,

OUT

= 450V

Electrical Characteristics (cont.)

(Test conditions unless otherwise specied: -40°C < TA < 85°C.)

Sym Parameter Min Typ Max Units Conditions

I

Minimum output current - 0.3 0.5 mA Includes R1 and load current

OUT

I

ADJ

Adjust output current 5.0 10 15 µA ---

C2 Minimum output load capacitance 1.0 - - µF ---

DV

/DVIN Ripple rejection ratio 50 60 - dB 120Hz, V

OUT

T

LIMIT

Junction temperature limit 125 - - °C ---

Thermal Characteristics

OUT

LR8

= 5V

Package

Power Dissipation

@ TA = 25°C

θ

jc

°C/W

TO-92 0.74W 125 170

TO-243AA 1.6W 15 78

TO-252 2.5W 6.25 50

Note:

† Mounted on FR4 board, 25mm x 25mm x 1.57mm.

Functional Block Diagram

VIN

Pass

Element

Overtemp & Overcurrent

10µA 1.2V

VOUT

ADJ

LR8

θ

ja

†

Doc.# DSFP-LR8 B080113

Supertex inc.

3

www.supertex.com

Typical Application Circuits

*

Figure 1: High Input Voltage, 5.0V Output Linear Regulator

V

=

IN

17 to 450V

C

1

* Required for conditions where V

Figure 2: SMPS Start-Up Circuit

VIN

LR8

VOUT

ADJ

R

2

18.2kΩ 1%

is less than V

IN

R

1

6.04kΩ 1%

OUT

V

= 5.0V

OUT

C

2

1.0µF

V

= 1.20V 1+

OUT

R

LOAD

2

1

≤16.5kΩ

+ I

ADJ

LR8

V

IN

= (V

+ 12V) to 450V

OUT

VIN

LR8

VOUT

ADJ

V

AUXILIARY

V

CC

FB

PWM IC

Figure 3: High Voltage Adjustable Constant Current Source

I

+

VIN

VOUT

R

OUT

=

1.20V R

+

1

V

OUT

-

+

V

1

OUT

-

Doc.# DSFP-LR8 B080113

V

=

IN

(V

+ 12V) to 450V

OUT

-

LR8

ADJ

1.0µF

4

Load

Supertex inc.

www.supertex.com

Typical Performance Curves

V

IN

LR8

V

OUT

LR8

Temperature Variation

1.30

1.25

= 1.2V

1.20

12V

12V, 200V 400V

ADJ

2.4k

Ω

1.0µF

(V)

1.15

OUT

V

1.10

1.05

1.00

-50 -25 0 25 50 75 100 125

T (junction) (OC)

Adjustment Current

12

11

I

ADJ

V

OUT = 1.2V

2.4kΩ

1.0ΩF

10

(µA)

ADJ

I

V

= 400V

IN

9

8

V

= 200V

7

IN

V

IN

= 12V

V

IN

LR8

ADJ

25V

Doc.# DSFP-LR8 B080113

6

-50 -25 0 25 50 75 100 125

T (junction) (OC)

Load Regulation

5.2

V

IN

LR8

ADJ

OUT

= 5.0V

6.04kΩ

±

1%

I

OUT

1.0µF R

LOAD

(V)

V

OUT

5.1

5.0

18.2kΩ

±

1%

4.9

4.8 0 2 4 6 8 10

I

(mA)

OUT

Supertex inc.

5

www.supertex.com

Typical Performance Curves (cont.)

05

V

IN

LR8

OUT

= 5.0V

LR8

V

vs. V

6

OUT

5

IN

0V to 50V

20V

P-P

@ 60Hz

65V

ADJ

18.2kΩ ±1%

6.04kΩ ±1%

1.0µF

1kΩ

4

(V)

3

OUT

V

2

1

0

01020304

V

(V)

IN

0

Ripple Rejection

-65

V

IN

V

= 5.0V

OUT

I

OUT

-64

LR8

ADJ

18.2kΩ

±

1%

6.04kΩ

±

1%

1.0µF R

LOAD

-63

-62

Ripple Regection Ratio (dB)

-61

Doc.# DSFP-LR8 B080113

-60 0 2 4 6 8 10

I

30

25

20

(mA)

CL

l

15

10

-40 -20 0 20 40 60 80 100

Temperature (OC)

6

(mA)

OUT

Supertex inc.

www.supertex.com

Typical Performance Curves (cont.)

Load Transient Response

V

OUT

= 5.0V

6.04kΩ ±1%

1.0µF

10kΩ

25V

V

IN

LR8

ADJ

18.2kΩ ±1%

Line Transient Response

sw

532Ω

Closed

SW

Open

V

OUT

LR8

Load Transient Response

400V

V

IN

0V

400V

V

IN

OUT

= 5.0V

400V

LR8

ADJ

18.2kΩ ±1%

V

IN

6.04kΩ ±1%

1.0µF

10kΩ

V

400V

V

0V

OUT

0V

IN

Line Transient Response

IN

0V

5.0V

V

OUT

0V

Doc.# DSFP-LR8 B080113

Line Power Up Transient

0V

5.0V

V

OUT

0V

Line Power Down Transient

Supertex inc.

7

www.supertex.com

3-Lead TO-252 D-PAK Package Outline (K4)

LR8

E

4

1 2 3

Front View

b3

E1

L3

θ1

D1

D

L4

L5

Note 1

b2

e

Rear View

b

View B

Side View

A

c2

H

L2

Gauge Plane

θ

L

L1

A1

Seating

Plane

View B

Note:

1. Although 4 terminal locations are shown, only 3 are functional. Lead number 2 was removed.

Symbol A A1 b b2 b3 c2 D D1 E E1 e H L L1 L2 L3 L4 L5

Dimen-

sion

(inches)

JEDEC Registration TO-252, Variation AA, Issue E, June 2004. * This dimension is not specied in the JEDEC drawing.

†

This dimension differs from the JEDEC drawing.

Drawings not to scale. Supertex Doc. #: DSPD-3TO252K4, Version F040910.

MIN .086 .000* .025 .030 .195 .018 .235 .205 .250 .170

NOM - - - - - - .240 - - - - .060 - - - - -

MAX .094 .005 .035 .045 .215 .035 .245 .217* .265 .200* .410 .070 .050 .040 .060 10O15

.090 BSC

.370 .055

.108

REF

.035 .025* .035†0O0

.020 BSC

θ

θ1

O

Doc.# DSFP-LR8 B080113

Supertex inc.

8

www.supertex.com

3-Lead TO-92 Package Outline (N3)

D

Seating Plane

1 2 3

L

LR8

A

Front View

E1

1

Bottom View

e1

b

e

c

Side View

E

3

2

Symbol A b c D E E1 e e1 L

MIN .170 .014

Dimensions

(inches)

NOM - - - - - - - - -

MAX .210 .022

JEDEC Registration TO-92. * This dimension is not specied in the JEDEC drawing. † This dimension differs from the JEDEC drawing.

Drawings not to scale. Supertex Doc.#: DSPD-3TO92N3, Version E041009.

Doc.# DSFP-LR8 B080113

†

.014

.022

†

.175 .125 .080 .095 .045 .500

†

.205 .165 .105 .105 .055 .610*

Supertex inc.

9

www.supertex.com

3-Lead TO-243AA (SOT-89) Package Outline (N8)

D

D1

E

H

E1

C

LR8

L

1 2 3

b

e

e1

Top View

b1

A

Side View

Symbol A b b1 C D D1 E E1 e e1 H L

†

1.50 BSC

3.00 BSC

3.94 0.73

Dimensions

(mm)

MIN 1.40 0.44 0.36 0.35 4.40 1.62 2.29 2.00

NOM - - - - - - - - - -

MAX 1.60 0.56 0.48 0.44 4.60 1.83 2.60 2.29 4.25 1.20

JEDEC Registration TO-243, Variation AA, Issue C, July 1986.

† This dimension differs from the JEDEC drawing Drawings not to scale. Supertex Doc. #: DSPD-3TO243AAN8, Version F111010.

(The package drawing(s) in this data sheet may not reect the most current specications. For the latest package outline

information go to http://www.supertex.com/packaging.html.)

Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives

an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com)

Doc.# DSFP-LR8 B080113

10

Supertex inc.

1235 Bordeaux Drive, Sunnyvale, CA 94089

Tel: 408-222-8888

www.supertex.com

†