LR645 DATA SHEET (04/09/2015) DOWNLOAD

LR645
High-Input Voltage SMPS, Start-up/Linear Regulator
Features
Description
• Accepts inputs from 15 to 450V
• Output currents: up to 3.0mA continuous, 30mA
peak
• Supply current typically 50µA
• Line regulation typically 0.1mV/V
• Output can be trimmed from 8.0 to 12V
• Output current can be increased to 150mA with
external FET
LR645 is a high-input voltage, low-output current, linear
regulator that is available in two versions. A 3-terminal,
fixed-output voltage version is available in TO-92, TO220 and SOT-89 packages, as well as an adjustable
voltage version available in an 8-lead SOIC package.
Applications
• Off-line SMPS startup circuits (pulse loads)
• Low power off-line regulators
• Regulators for noisy inputs
The 3-terminal version of LR645 functions like any
other low-voltage, 3-terminal regulator except it allows
the use of much higher-input voltages. When used in a
Switched-mode Power Supply (SMPS), start-up circuit,
LR645 eliminates the need for large power resistors. In
this application, current is drawn from the high voltage
line only during start-up. Only leakage current flows
after start-up, thereby reducing the continuous power
dissipation to a few milliwatts.
The adjustable-voltage version allows trimming of the
output voltage from 8.0 to 12V. This version can also be
connected to an external depletion mode metal–oxide–
semiconductor field-effect transistor (MOSFET) for
increased output current. When used in conjunction
with depletion mode MOSFET DN2540N5, an output
current of up to 150mA is achieved.
WARNING
The LR645 does NOT provide galvanic isolation. When operated from an AC line, potentially lethal voltages can be
present on the IC. Adequate means of protecting the end user from such voltages must be provided by the circuit
developer.
 2015 Microchip Technology Inc.
DS20005384A-page 1
LR645
Package Type
TRIM
NC
GATE
NC
VOUT
VIN
VOUT
GND
NC
+VIN
GND
TO-92
8-Lead SOIC
GND
GND
VOUT
GND
VIN
TO-243AA (SOT-89)
VOUT
+VIN
GND
TO-220
See Table 2-1 for pin information
DS20005384A-page 2
 2015 Microchip Technology Inc.
LR645
1.0
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
Input Voltage .................................................................................................................................................................................. 450V
Output voltage............................................................................................................................................................................... 15.5V
Operating and storage temperature ............................................................................................................................. -55°C to +150°C
Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at those or any other conditions, above those indicated in the operational listings of
this specification, is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
1.1
ELECTRICAL SPECIFICATIONS
TABLE 1-1:
Symbol
VOUT
∆VOUT
ELECTRICAL CHARACTERISTICS 1
Parameter
Min
Typ
Max
Output voltage
9.3
10
10.7
V
No load
Output voltage over temperature2
9.0
10
11.5
V
TJ = - 40 to +125°C, No load
-
40
200
mV
VIN = 15 to 400V, No load
VIN = 50V, IOUT = 0 to 3.0mA
Line regulation
Load regulation
Units Conditions
-
150
400
mV
15
-
450
V
Input quiescent current
-
50
150
µA
No Load
IOFF
VIN off-state leakage current
-
0.1
10
µA
VAUX ≥ VOUT +1V applied to VOUT pin
IAUX
Input current to VOUT
VIN
Operating input voltage range
IINQ
-
-
200
µA
VAUX ≥ VOUT +1V applied to VOUT pin
50
60
-
dB
120 Hz, No Load
voltage2
-
25
-
µV
0.01 to 100 KHz
IPEAK
Output peak current3
-
30
-
mA
COUT = 10 µF, VIN = 400V
VAUX
External voltage applied to VOUT
-
-
13.2
V
∆VOUT/∆VIN Ripple rejection ratio2
en
Noise
8-lead, adjustable voltage version only
VOUT
∆VOUT
1
2
3
8
-
12
V
Load regulation at 8V trim2
-
200
400
mV
VIN = 15V, IOUT = 0 to 1.0 mA
Load regulation at 12V trim2
-
100
400
mV
VIN = 50V, IOUT = 0 to 3.0 mA
No load
Test Conditions unless otherwise specified: TA = 25°C, VIN = 15V-450V, COUT = 0.01 µF
Guaranteed by design
Pulse test duration <1.0 msec, duty cycle <2%
TABLE 1-2:
1
Output regulation trim range2
THERMAL CHARACTERISTICS1
Package
θja
Power Dissipation @TA=25°C
8-lead SOIC
101°C/W
0.31
0.74
TO-92
132°C/W
TO-220
29°C/W
1.8
TO-243AA (SOT-89)
133°C/W
1.6
Mounted on FR5 board; 25mm x 25mm x 1.57mm. Significant PD increase possible on ceramic substrate.
 2015 Microchip Technology Inc.
DS20005384A-page 3
LR645
2.0
PIN DESCRIPTION
The locations of the pins are listed in Package Type.
TABLE 2-1:
Function
PIN DESCRIPTION
Description
VIN
Regulator input. 8 - 450V.
GND
Ground return for all internal circuitry. This pin must be electrically connected to circuit common.
GATE
Output GATE driver for an external N-channel depletion.
TRIM
A voltage divider from VOUT to this pin adjusts the output voltage.
VOUT
Regulator output.
NC
No connection.
DS20005384A-page 4
 2015 Microchip Technology Inc.
LR645
3.0
FUNCTIONAL DESCRIPTION
3.1
SMPS Start-Up Circuit
through a diode to the VOUT pin of LR645 will start to
increase. When the auxiliary voltage becomes larger
than the output voltage LR645 turns OFF both its internal high voltage input line and output voltage, allowing
the auxiliary voltage to power the VCC line of the PWM
IC. After startup, LR645 doesn’t draw any input current
from the high-voltage line other than the leakage current of the internal MOSFET switch, which is typically
0.1µA.
One of the main applications for LR645 is a start-up circuit for off-line, switch-mode power supplies (SMPS),
as shown in Figure 3-1. A minimum output capacitance
of 10 nF is recommended for stability. The wide operating, input voltage range of LR645 allows the SMPS to
operate and start-up from rectified AC, or a DC voltage
of 15 to 450V, without adjustment.
The 3-terminal version shown in Figure 3-1 has load
regulation guaranteed from 0 to 3.0mA at a fixed nominal output voltage of 10V. Applications requiring higher
output current and/or a different output voltage can use
the 8 pin adjustable version.
During start-up, the LR645 powers the VCC line of the
Pulse-Width Modulation (PWM) IC with a nominal output voltage of 10V. The auxiliary voltage connected
FIGURE 3-1:
SMPS START-UP CIRCUIT
+
+
5.0V
VAUX = 12V
15 - 450V
VCC
VIN
LR6
CIN
PWM IC
COUT
GND
-
3.2
High-Current SMPS Start-Up
Circuit
breakdown voltage of the external MOSFET, but cannot exceed the 450V rating of LR645.
The 8-lead version of LR645 has connections for an
external depletion-mode MOSFET for higher-output
current and external resistors for adjustable-output
voltage. As shown in Figure 3-2, the output current is
increased to 150mA by using the DN2540, a 400V
depletion-mode MOSFET. The maximum operating
input voltage will be limited by the drain-to-source,
The output voltage can be adjusted from 8 to 12V with
two external resistors: R1 and R2. The ratio of R2/R1
determines the output voltage. R2 is connected
between the VOUT and TRIM pins; R1 is connected
between TRIM and GND pins. Figure 3-3 is a curve
showing output voltage versus resistor ratio R2/R1.
The optimum range for R1 + R2 is 200KΩ to 300KΩ.
This minimizes loading and optimizes accuracy of the
output voltage. Figure 3-3 uses an R1 + R2 of 250KΩ.
FIGURE 3-2:
HIGH-CURRENT SMPS START-UP CIRCUIT
+
+
5.0V
DN2540
–
VAUX = 12V
GATE
15V
to
400V
VCC
VOUT
LR645
CIN
R2
TRIM
GND
COUT
PWM IC
R1
–
Note:
When used with the DN25, +VIN is not connected on the LR6.
 2015 Microchip Technology Inc.
DS20005384A-page 5
LR645
FIGURE 3-3:
TYPICAL OUTPUT
VOLTAGE VS RESISTOR
RATIO
Figure 3-4 shows the LR645 as a pre-regulator to a
precision regulator for high precision regulation. Higher
output current is also possible by using an external
depletion-mode MOSFET DN2540N5 as shown in
Figure 3-5.
12
Output Voltage (V)
FIGURE 3-4:
Max
875
ACSA
LR6
10
AC Line
24V - 277V
R1 + R2 = 250kΩ
3.4
8
2.5
3.0
3.5
Off Line Linear Regulator
COUT
0.1μF
Power Dissipation Considerations
P DISS =  V IN – V OUT    I OUT + I MAXQuiescent 
=  400V – 10V    3.0mA + 150A 
= 1.23Watts
Circuits that require low voltages to operate logic and
analog circuits benefit from LR645. The conventional
use of step-down transformers can be eliminated,
thereby saving space and cost. Some examples of lowvoltage applications are: proximity controlled light
switches, street lamp controls, and low-voltage power
supplies for appliances such as washing machines,
dishwashers, and refrigerators.
The 1.23 watts is for continuous operation. This is
within the dissipation capabilities of the TO-220 and
SOT-89 packages. See Table 1-2 on Page 3 for deratings. For SMPS start-up applications, the output current is usually required only during start-up. This
duration depends upon the auxiliary supply output
capacitor and COUT, but is typically a few hundred milliseconds. All package types of the LR645 have been
characterized for use with a COUT of at least 10µF, and
an AC line of 277V.
The wide operating-input voltage range of 15 to 450V,
as well as the ripple rejection ratio of 50dB minimum,
allows the use of a small, high-voltage input capacitor.
The input AC line can be either full-wave or half-wave
rectified. A minimum output capacitance of 0.01µF is
recommended for output stability.
FIGURE 3-5:
CIN
1.0μF
5.000V
± 0.002V
@
0 to 3mA
LR645 is a true linear regulator. Its power dissipation is
therefore a function of input voltage and output load
current. For example, if the LR645 provides a continuous load current of 3mA at 10V, while its input voltage
is 400V, total dissipation in the LR645 will be:
4.0
Resistor Ratio (R2/R1)
3.3
CASCADING FOR
PRECISION
HIGH-CURRENT REGULATION
DN2540N5
AC Line
24 - 277V
GATE
CIN
LR645
VOUT
COUT
5.0V
REG
5.0V
+
0 - 150mA
-
GND
DS20005384A-page 6
 2015 Microchip Technology Inc.
LR645
FIGURE 3-6:
BLOCK DIAGRAM
VIN
LR645
VOUT
TRIM
–
+
GATE
GND
 2015 Microchip Technology Inc.
DS20005384A-page 7
LR645
4.0
PACKAGING INFORMATION
4.1
Package Marking Information
Example
8-lead SOIC
XXXXXXXX
XX e3 YYWW
NNN
LR645LG
e3 1508
343
Example
3-lead TO-220
XXXYYWW
NNN
3-lead TO-92
XXXXXX
XXXX e3
YWWNNN
Legend: XX...X
Y
YY
WW
NNN
e3
*
DS20005384A-page 8
LR6508
343
Example
LR645
N3 e3
508343
LR645N5
e3 1508343
XXXXXXXXX
XXXXXXX e3
YYWWNNN
Note:
Example
3-lead TO-243AA *
(SOT-89)
Product Code or Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for product code or customer-specific information. Package may or
not include the corporate logo.
 2015 Microchip Technology Inc.
LR645
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
 2015 Microchip Technology Inc.
DS20005384A-page 9
LR645
3-Lead TO-243AA (SOT-89) Package Outline (N8)
D
D1
C
E H
1
2
E1
3
L
b
b1
A
e
e1
Side View
Top View
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
Symbol
Dimensions
(mm)
A
b
b1
C
D
D1
E
E1
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
e
1.50
BSC
e1
3.00
BSC
H
L
3.94
0.73†
-
-
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.
DS20005384A-page 10
 2015 Microchip Technology Inc.
LR645
3-Lead TO-220 Package Outline (N5)
A
E
ΦP
E2
Seating
Plane
A1
A
Thermal
Pad
E
Q
H1
4
D2
D
D1
Chamfer
Optional
1
2
3
E1
L
View
B
A2
c
e
Front View
A
Side View
1
View A - A
3
2
L1
b
b2
View B
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
Symbol
Dimension
(inches)
A
A1
A2
b
b2
c
D
D1
D2
E
E1
E2
MIN
.140
.020
.080
.015
.045
.012†
.560
.326†
.474†
.380
.270
0.20*
NOM
-
-
-
.027
.057
-
-
-
-
-
-
-
MAX
.190
.055
.120†
.040
.070
.024
.650
.361†
.507
.420
.350
.030
e
.100
BSC
H1
L
L1
Q
ĭP
.230
.500
.200*
.100
.139
-
-
-
-
-
.270
.580
.250
.135
.161
JEDEC Registration TO-220, Variation AB, Issue K, April 2002.
7KLVGLPHQVLRQLVQRWVSHFL¿HGLQWKH-('(&GUDZLQJ
‚7KLVGLPHQVLRQGLIIHUVIURPWKH-('(&GUDZLQJ
Drawings not to scale.
 2015 Microchip Technology Inc.
DS20005384A-page 11
LR645
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
DS20005384A-page 12
 2015 Microchip Technology Inc.
LR645
APPENDIX A:
REVISION HISTORY
Revision A (April 2015)
• Update file to new format
 2015 Microchip Technology Inc.
DS20005384A-page 13
LR645
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
Device
-
XX
X
-
Package Environmental
Options
Device:
Package:
LR645
X
Media
Type
= High-Input, Voltage SMPS, Start-up/Linear
Regulator
LG
N3
N5
N8
=
=
=
=
Environmental
G
= Lead (Pb)-free/ROHS-compliant package
Media Type:
(blank)
=
=
=
=
DS20005384A-page 14
8-lead SOIC (adjustable voltage)
TO-92 (fixed voltage)
TO-220(fixed voltage)
TO-243AA (SOT-89) (fixed voltage)
Examples:
a)
LR645LG-G:
b)
LR645N3-G
c)
LR645N3-G-P003:
d)
LR645N3-G-P013:
e)
LR645N5-G
f)
LR645N8-G
8-lead SOIC package,
3300/reel.
TO-92 package,
1000/bag
TO-92 package,
2000/reel.
TO-92 package,
2000/ammo pack.
TO-220 package,
50/tube
TO-243AA package,
2000/reel
3300/Reel for LG packages
1000/Bag for N3 packages
50/Tube for TO-220 packages
2000/Reel for TO-243AA packages
P003
= 2000/Reel for N3 package
P013
= 2000/Ammo Pack for N3 package
 2015 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
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Information contained in this publication regarding device
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The Microchip name and logo, the Microchip logo, dsPIC,
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MTP, SEEVAL and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
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Silicon Storage Technology is a registered trademark of
Microchip Technology Inc. in other countries.
Analog-for-the-Digital Age, Application Maestro, BodyCom,
chipKIT, chipKIT logo, CodeGuard, dsPICDEM,
dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, Mindi, MiWi, MPASM, MPF, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code
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SQTP is a service mark of Microchip Technology Incorporated
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All other trademarks mentioned herein are property of their
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Printed on recycled paper.
ISBN: 978-1-63277-244-2
QUALITYMANAGEMENTSYSTEM
CERTIFIEDBYDNV
== ISO/TS16949==
 2015 Microchip Technology Inc.
Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
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and manufacture of development systems is ISO 9001:2000 certified.
DS20005384A-page 15
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Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenzhen
Tel: 86-755-8864-2200
Fax: 86-755-8203-1760
Taiwan - Hsin Chu
Tel: 886-3-5778-366
Fax: 886-3-5770-955
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Kaohsiung
Tel: 886-7-213-7828
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Germany - Pforzheim
Tel: 49-7231-424750
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Italy - Venice
Tel: 39-049-7625286
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Poland - Warsaw
Tel: 48-22-3325737
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
Sweden - Stockholm
Tel: 46-8-5090-4654
UK - Wokingham
Tel: 44-118-921-5800
Fax: 44-118-921-5820
Taiwan - Taipei
Tel: 886-2-2508-8600
Fax: 886-2-2508-0102
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
01/27/15
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 2015 Microchip Technology Inc.