LR8K4-G [SUPERTEX]

High Input Voltage Adjustable 3-Terminal Linear Regulator; 高输入电压可调三端线性稳压器


型号：	LR8K4-G
厂家：	Supertex, Inc
描述：	High Input Voltage Adjustable 3-Terminal Linear Regulator 高输入电压可调三端线性稳压器线性稳压器IC 调节器电源电路输出元件
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LR8

High Input Voltage

Adjustable 3-Terminal Linear Regulator

Features

General Description

The Supertex LR8 is a high voltage, low output current,

adjustable linear regulator. It has a wide operating input

voltage range of 13.2V 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 V_OUTby 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

► Off-line SMPS startup circuits

► Adjustable high voltage constant current source

► Industrial controls

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.

► Motor controls

► Battery chargers

► Power supplies

The device is available in TO-243AA (SOT-89), TO-252 (D-

PAK), and TO-92 packages.

Typical Application Circuit

V_OUT

ADJ

LR8

R_LOAD

*Required for conditions where V_INis less than V_OUT

LR8

Ordering Information

Package Option

DEVICE

TO-243AA

TO-252

TO-92

LR8

LR8N8-G

LR8K4-G

LR8N3-G

-G indicates package is RoHS compliant (‘Green’)

Pin Conﬁgurations

V_OUT

Absolute Maximum Ratings

Parameter

V_OUT

Value

V_INinput voltage (voltages ref to ADJ)

Output voltage range

-0.5V to +480V

-0.5V to +470V

-40°C to +85°C

-40°C to +125°C

-65°C to +150°C

Operating ambient temperature range

Operating junction temperature range

Storage temperature range

V_IN

ADJ

V_IN

ADJ

V_OUT

V_IN

ADJ

V_OUT

TO-252 (D-PAK)

TO-243AA (SOT-89)

TO-92

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)

(front view)

Product Marking

Product marking for TO-243AA:

LR8

where = 2-week alpha date code

Electrical Characteristics^{(Test conditions unless otherwise speciﬁed: -40°C < TA < 85°C.)}

Symbol

Parameter

Min

Typ

Max Units Conditions

V_IN- V_OUT

Input to output voltage difference

450

1.26

425

---

13.2V < V_IN< 400V,

R1 = 2.4KΩ, R2 = 0

V_OUT

Overall output voltage regulation

Line regulation

1.14

375

1.20

400

V_OUT

R1 = 2.4KΩ, R2 = 782KΩ

17V < V_IN< 400V, V_OUT= 5V,

I_OUT= 0.5mA

ΔV_OUT

0.003

0.01

%/V

V_IN= 17V, V_OUT= 5V,

0.5mA <I_OUT< 10mA

ΔV_OUT

Load regulation

1.4

3.0

V_IN= 17V, V_OUT= 5V, I_OUT= 10mA,

-40°C < T_A< 85°C

Temperature regulation

-1

I_OUT

I_ADJ

Output current limit

0.5

mA T_J< 85°C, V_IN- V_OUT= 12V

mA T_J> 125°C, V_IN- V_OUT= 450V

mA Includes R1 and load current

Output current limit

Minimum output current

Adjust output current

0.3

µA

µF

°C

---

Minimum output load capacitance

---

DV_OUT/DV_INRipple rejection ratio

T_LIMITJunction temperature limit

125

120Hz, V_OUT= 5V

---

LR8

Thermal Characteristics

Power Dissipation

°C^J/^CW

°C^J/W^A

Package

@ T_A= 25°C

TO-92

0.74W

125

170

78†

50†

TO-243AA

1.6W

TO-252

2.5W

6.25

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

Signiﬁcant PD increase possible on ceramic substrate.

Functional Block Diagram

LR8

V_IN

V_OUT

ADJ

Pass

Element

Overtemp &

Overcurrent

1.2V

10µA

Typical Application Circuits

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

_OUT= 5.0V

V_IN

V_OUT

ADJ

V_IN= 17V to 450V

6.04KΩ

LR8

R_LOAD≤16.5KΩ

1.0µF

18.2KΩ

+ I_ADJ

V_OUT= 1.20V 1+

* Required for conditions where V_INis less than V_OUT

LR8

Typical Application Circuits

Figure 2: SMPS Start-Up Circuit

V_IN= (V_OUT+ 12V) to 450V

V_AUXILIARY

V_OUT

V_IN

V_OUT

ADJ

V_OUT2

LR8

V_CC

PWM IC

Figure 3: High Voltage Adjustable Constant Current Source

1.20V

I_{OUT =}

V_OUT

ADJ

V_IN

LR8

V_IN= (V_OUT+ 12V) to 450V

LOAD

1.0µF

LR8

Typical Performance Curves

Temperature Variation

1.30

1.25

1.20

1.15

1.10

V_IN

V_OUT= 1.2V

LR8

ADJ

12V

2.4K

1.0µF

1.05

1.00

-50

-25

100

125

T(junction) ( C)

Adjustment Current

V_IN

V_OUT= 1.2V

2.4KΩ

LR8

V_IN= 400V

V_IN= 12V

12V,

200V,

400V

ADJ

1.0ΩF

I_ADJ

V_IN= 200V

-50

-25

100

125

T(junction) ( C)

Load Regulation

5.2

V_IN

V_OUT= 5.0V

I_OUT

LR8

5.1

5.0

6.04KΩ

ADJ

25V

1.0µF

R_LOAD

18.2KΩ

4.9

4.8

I_OUT(mA)

LR8

Typical Performance Curves ^(cont.)

V_OUTvs. V_IN

V_OUT= 5.0V

V_IN

LR8

6.04KΩ

ADJ

1.0µF

0V to 50V

1KΩ

18.2KΩ

V_IN(V)

Ripple Rejection

-65

-64

-63

-62

I_OUT

V_OUT= 5.0V

V_IN

LR8

ADJ

6.04KΩ

20V_P-P

@ 60Hz

1.0µF

R_LOAD

65V

18.2KΩ

-61

-60

I_OUT(mA)

-40

-20

100

Temperature (°C)

LR8

Typical Performance Curves ^(cont.)

LR8

Ω

Load Transient Response

Line Transient Response

Line Power Down Transient

LR8

Ω

Line Power Up Transient

LR8

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

4.50 0.10

1.72 0.10

1.50 0.10

0.40 0.05

Exclusion Zone

No Vias/Traces in

this area. Shape

of pad may vary.

4.10 0.15

2.45 0.15

2.21 0.08

1.05 0.15

0.42 0.06

0.5 0.06

1.50 BSC

3.00 BSC

Top View

Side View

Bottom View

Notes:

All dimensions are in millimeters; all angles in degrees.

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

0.250 - 0.265

0.195 -0.215

0.086 - 0.094

0.035 - 0.050

0.018 - 0.035

0^O- 15^O

0.370 - 0.410

0.240 0.005

0.040 MAX

0.005 MAX

0.047 - 0.070

0.108 REF

0.030 - 0.045

0.090 BSC

0^O- 10^O

0.025 - 0.035

0.018 - 0.024

0.20 BSC

0.170 MIN

Cutouts may not

be present

0.205 MIN

Notes:

All dimensions in inches; angles in degrees

LR8

3-Lead TO-92 Package Outline (N3)

0.135 MIN

0.125 - 0.165

0.080 - 0.105

Top View

0.175 - 0.205

0.170 - 0.210

1 2 3

Seating Plane

0.500 MIN

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

LR8K4-G [SUPERTEX]

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