LR745 [MICROCHIP]
High-Input Voltage SMPS Start-up;
| 型号： | LR745 |
| 厂家： | 
MICROCHIP |
| 描述： | High-Input Voltage SMPS Start-up |
| 文件： | 总15页 (文件大小：333K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LR745
High-Input Voltage SMPS Start-up
Features
Description
• Accepts inputs from 35 to 450V
• Output current limiting
LR745 is a high input voltage SMPS start-up circuit.
LR745 is ideally suited for use with industry standard
low-voltage, Pulse-Width Modulation (PWM) ICs hav-
ing start thresholds of 13.9 to 18.0V. It allows the PWM
ICs to be operated from rectified 120 or 240VAC lines,
and eliminates the use of power resistors often used for
this purpose.
• For PWM ICs with start-up threshold voltage of
13.9 - 18.0V
• Very low power consumption after start-up
Applications
The internal circuitry of the LR745 allows the PWM ICs
to operate at a VCC voltage below their start-threshold
voltage after start-up. The auxiliary voltage can be less
than the start-threshold voltage, which allows for
improved efficiency. Current from the high voltage line
is drawn only during the start-up period. After start-up,
the internal, high-voltage line is disconnected from the
IC, thereby reducing the continuous power dissipation
to a minimum.
• Notebook and laptop computers
• Telecommunication power supplies
• Battery chargers
• Motor controllers
2015 Microchip Technology Inc.
DS20005394A-page 1
LR745
Package Type
GND
VOUT
VIN
VOUT
GND
VIN
GND
TO-92
See Table 2-1 for pin information
TO-243AA (SOT-89)
DS20005394A-page 2
2015 Microchip Technology Inc.
LR745
1.0
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
Input Voltage .................................................................................................................................................................................. 450V
Output voltage.................................................................................................................................................................................. 25V
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
1
TABLE 1-1:
Symbol
ELECTRICAL CHARACTERISTICS
Parameter
Min
Typ
Max Units Conditions
Output voltage
18.0
17.7
2.0
24
24.3
4.0
V
V
IOUT= 0
VOUT
VOUT over temperature
IOUT= 0, TA= -40°C to +85°C
IOUT
VIN
Output current limiting
Operating input voltage range
Input quiescent current
Output turn off voltage
VOFF over temperature
Output reset voltage
3.0
mA
V
35
450
500
IINQ
µA
V
VIN= 400V, IOUT= 0
TA= -40°C to +85°C
12.6 13.25 13.9
12.3 13.25 14.2
VOFF
V
6.3
6.0
7.0
7.0
7.7
8.0
75
V
VRESET
VRESET over temperature
V
TA= -40°C to +85°C
VIN= 400V
IOFF
VAUX
IAUX
VIN off-state leakage current
µA
External voltage applied to
VOUT
22
V
Input current applied to VOUT
500
µA
VAUX= 22V
1
Test Conditions unless otherwise specified: TA = 25°C, VIN = 450V
TABLE 1-2:
THERMAL CHARACTERISTICS
Package
θja
TO-92
132°C/W
133°C/W
TO-243AA (SOT-89)
2015 Microchip Technology Inc.
DS20005394A-page 3
LR745
2.0
PIN DESCRIPTION
The locations of the pins are listed in Package Type.
TABLE 2-1:
Function
PIN DESCRIPTION
Description
VIN
GND
VOUT
Regulator input. 8 - 450V.
Ground return for all internal circuitry. This pin must be electrically connected to circuit common.
Regulator output.
DS20005394A-page 4
2015 Microchip Technology Inc.
LR745
supplied by C1, causing the VCC voltage decrease.
When VCC decreases to 13.25V, LR745 will turn off its
output, thereby reducing its input current from 3.0mA to
10s of microamperes. At this point, all 20mA will be
supplied by C1. The PWM IC can now operate to a min-
imum VCC voltage, typically 10V.
3.0
APPLICATION INFORMATION
Figure 3-1 shows a simplified typical configuration of a
switch mode power supply, SMPS, using LR745 in the
start-up circuit.
LR745’s VOUT terminal is connected to the VCC line of
a PWM IC. An auxiliary winding on the transformer
generates a VCC voltage to power the PWM IC after
start-up. LR745 supplies power for the PWM IC only
during start-up. After start-up, LR745 turns off and the
auxiliary winding supplies power for the PWM IC.
Figure 3-2 shows the typical current and voltage wave-
forms at various stages from power-up to operation
powered by the auxiliary winding.
Once the switching MOSFET starts operating, the
energy in the primary winding is transferred to the sec-
ondary outputs and the auxiliary winding, thereby build-
ing up VAUX. It is necessary to size the VCC storage
capacitor, C1, such that VAUX increases to a voltage
greater than 10V before VCC decreases to 10V. This
allows VAUX to supply the required operating current for
the PWM IC.
If for some reason the auxiliary voltage does not reach
10V, VCC will continue to decrease. Once VCC goes
below 10V, the PWM IC will return to its start-up condi-
tion. The PWM IC will now only draw 0.5mA. VCC will
continue to decrease but at a much slower rate. Once
VCC decreases below 7.0V, LR745 will turn the output,
VOUT, back on. VOUT will start charging C1 as described
in Stage I.
3.1
Stage I
Once a voltage is applied on VIN, LR745 starts to
charge the VCC capacitor, C1. The VCC voltage starts to
increase at a rate limited by the internal current limiter
of 3.0mA. The PWM IC is in its start-up condition and
will typically draw 0.5mA from the VCC line. The VCC
voltage will continue to increase until it reaches the
PWM IC’s start threshold voltage, typically 16V.
3.3
Stage III
3.2
Stage II
At this stage, LR745 output is turned off and the PWM
IC is operating from the VAUX supply. The auxiliary volt-
age, VAUX, can be designed to vary anywhere between
the minimum operating VCC voltage of the PWM IC
(10V) to the maximum auxiliary voltage rating of the
LR745 (22V).
Once VCC reaches 16V, the PWM IC is in its operating
condition and will typically draw 20mA, depending on
the operating frequency and size of the switching
metal–oxide–semiconductor field-effect transistor
(MOSFET). The output of LR745, VOUT, is internally
current limited to 3.0mA. The remaining 17mA will be
FIGURE 3-1:
SIMPLIFIED SMPS USING LR745
High Voltage
VIN
VAUX
IIN
D2
IAUX
C2
VCC
VOUT
LR7
PWM IC
C1
GND
2015 Microchip Technology Inc.
DS20005394A-page 5
LR745
FIGURE 3-2:
START-UP WAVEFORMS
Stage
I
Stage
II
Stage
III
16.0
PWM IC Start Threshold Voltage
VOUT
(V)
LR7 VOFF Trip Point
13.5
12.0
Auxiliary Supply Powers PWM IC
8.0
4.0
t
0.0
3.0
IIN
(mA)
2.0
1.0
I
IN ≈ 0mA
t
t
t
0.0
12.0
8.0
4.0
VAUX
(V)
V
AUX = 12V
0.0
30.0
IAUX = 20mA
20.0
10.0
0.0
I
(AmUXA)
DS20005394A-page 6
2015 Microchip Technology Inc.
LR745
3.4
Block Diagram
FIGURE 3-3:
BLOCK DIAGRAM
VIN
R4
M1
+
23V
-
VZ
M2
2.0 - 4.0mA
VOUT
VREF
R1
Reset
-
comp1
+
R2
R3
VOUT
Q
R D
-
comp1
+
CLK
Clock
GND
LR745 is a high voltage, switch-mode power supply
start-up circuit which has 3 terminals: VIN, GND, and
VOUT. An input voltage range of 35 - 450V DC can be
applied directly at the input VIN pin. The output voltage,
VOUT, is monitored by the 2 comparators: comp1 and
comp2. An internal reference, VREF, and resistor
divider R1, R2, and R3set the nominal VOUT trip points
of 7.0V for comp1 and 13.25V for comp2.
VOUT will start to decrease when it is connected to an
external load greater than the internal constant current
source, which is the case when the PWM IC starts up.
When VOUT falls below 13.25V, the output of comp2 will
switch from a logic low to a logic high. The output of
comp2 will clock in a logic 1 into the D flip-flop, causing
the D flip-flop’s output, Q, to switch from a logic low to
a logic high. Transistor M2 will then be turned on pulling
the gate of transistor M1 to ground, thereby turning
transistor M1 off. Transistor M1 will remain off as long
as VOUT is greater than 7.0V. Once VOUT decreases
below 7.0V, comp1 will reset the D flip-flop, thereby
turning transistor M2 off and transistor M1 back on.
When a voltage is applied on VIN, VOUT will start to
ramp up from 0V. When VOUT is less than 7.0V, the out-
put of comp1 will be at a logic high state, keeping the D
flip-flop in a reset state. The output of the D flip-flop, Q,
will be at logic low keeping transistor M2 off. The data
input for the D flip-flop, D, is internally connected to a
logic high. As VOUT becomes greater than 7.0V, comp1
will change to a logic low state. VOUT will continue to
increase, and the constant current source, typically
3.0mA output, will charge an external storage capaci-
tor. As VOUT reaches above 13.25V, the output of
comp2 will then switch from a logic high to a logic low
state. The D flip-flop’s output does not change state
since its clock input is designed to trigger only on a ris-
ing edge, logic low to logic high transition. When there
is no load connected to the output, the output voltage
will continue to increase until it reaches 21.5V, which is
the Zener voltage minus the threshold voltage of tran-
sistor M1. The Zener voltage is typically 23V, and the
threshold voltage of M1 is typically 1.5V. The Zener
diode is biased by resistor R4.
2015 Microchip Technology Inc.
DS20005394A-page 7
LR745
4.2
SMPS with wide minimum to
maximum load
4.0
DESIGN CONSIDERATIONS
To ensure the best design using LR745, evaluate the
value of C1 and the SMPS requirements.
An important point is that the LR745’s output voltage,
VOUT, must discharge to below the nominal VOFF trip
point of 13.25V in order for its output to turn off. If the
SMPS requires a wide minimum to maximum output
load variation, it will be difficult to guarantee that VCC
will fall below 13.25V under minimum load conditions.
Consider an SMPS that is required to power small as
well as large loads and is also required to power up
quickly. Such a SMPS may power up too fast with a
small load, not allowing the VCC voltage to fall below
13.25V. For such conditions, the circuit in Figure 4-1 is
recommended.
4.1
Calculating the value for C1
Sizing the VCC capacitor, C1, is an important factor.
Making C1 too large will cause the SMPS to power up
too slowly. However, if too small, C1 will not allow the
SMPS to power up due to insufficient charge in the
capacitor to power the IC and MOSFET until the auxil-
iary supply is available. The value of C1 can be approx-
imated by the following equation:
1
f
--
N 1
In Figure 4-1, the VREF pin of the UC3844 is used to
bias the ground pin of the LR745. The VREF pin on the
UC3844 is a 5.0V reference, which stays at 0V until the
VCC voltage reaches the start threshold voltage. Once
VCC reaches the start threshold voltage, VREF will
switch digitally from 0V to 5.0V. During start-up, the
LR745 will be on, and VCC will start to increase up to
16V. Once VCC reaches16V, the UC3844 will start to
operate and VREF will increase from 0V to 5.0V. The
LR745 will see an effective VOUT voltage of 11V (16V
minus 5.0V) because the ground of the LR745 is now
at 5.0V. The LR745 will immediately turn off its output,
VOUT, without having to wait for the VCC voltage to
decrease. The VREF switching from 0 to 5.0V during
start is a common feature in most PWM ICs.
C1 = ------------------------------------
V
START – VMIN
Definitions:
- f = switching frequency
- N = number of clock cycles required to
charge VAUX to VMIN value
- I = PWM operating current
- VSTART = PWM IC start threshold rating
- VMIN = PWM IC minimum VCC operating volt-
age
Consider for example, a PWM IC with a switching fre-
quency of 100KHz, operating current of 20mA, start
threshold of 16V, and a minimum operating voltage of
10V. If 100 clock cycles are required to charge the aux-
iliary voltage to 10V, the minimum value of C1 is calcu-
lated as follows:
1
--------------------
100 20mA
100kHz
C1 = ----------------------------------------------------------------
16V – 10V
C1 = 3.3F
FIGURE 4-1:
USING V
FOR GROUND VOLTAGE
REF
VIN
VOUT
VCC
LR7
C1
PWM IC
VREF
GND
DS20005394A-page 8
2015 Microchip Technology Inc.
LR745
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
3-lead TO-92
Example
LR745
Example
3-lead TO-243AA *
(SOT-89)
XXXXXX
XXXYYWW
LR7513
e3
e3
XXXX
N3
YWWNNN
513343
NNN
343
Legend: XX...X Product Code or Customer-specific information
Y
Year code (last digit of calendar year)
YY
WW
NNN
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 (
can be found on the outer packaging for this package.
e
3
*
)
e
3
Note: 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.
DS20005394A-page 9
LR745
3-Lead TO-243AA (SOT-89) Package Outline (N8)
D
D1
C
H
E
E1
1
2
3
L
b
b1
A
e
e1
Top View
Side View
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
Symbol
A
1.40
-
b
0.44
-
b1
0.36
-
C
0.35
-
D
4.40
-
D1
1.62
-
E
2.29
-
E1
2.00†
-
e
e1
H
3.94
-
L
0.73†
-
MIN
NOM
MAX
Dimensions
(mm)
1.50
BSC
3.00
BSC
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.
DS20005394A-page 10
2015 Microchip Technology Inc.
LR745
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
2015 Microchip Technology Inc.
DS20005394A-page 11
LR745
APPENDIX A: REVISION HISTORY
Revision A (April 2015)
• Update file to new format
DS20005394A-page 12
2015 Microchip Technology Inc.
LR745
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
X
Examples:
a)
b)
c)
d)
LR745N3-G
TO-92 package,
1000/bag
Package Environmental Media
Options Type
LR745N3-G-P003:
LR745N3-G-P013:
LR745N8-G
TO-92 package,
2000/reel.
TO-92 package,
2000/ammo pack.
TO-243AA package,
2000/reel
Device:
LR745 = High-Input, Voltage SMPS, Start-up/Linear
Regulator
Package:
N3
N8
= TO-92 (fixed voltage)
= TO-243AA (SOT-89) (fixed voltage)
Environmental
Media Type:
G
= Lead (Pb)-free/ROHS-compliant package
(blank) = 1000/Bag for N3 packages
= 2000/Reel for N8 packages
P003
P013
= 2000/Reel for N3 package
= 2000/Ammo Pack for N3 package
2015 Microchip Technology Inc.
DS20005394A-page 13
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
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
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Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
FlashFlex, flexPWR, JukeBlox, KEELOQ, KEELOQ logo, Kleer,
LANCheck, MediaLB, MOST, MOST logo, MPLAB,
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SST, SST Logo, SuperFlash and UNI/O are registered
trademarks of Microchip Technology Incorporated in the
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The Embedded Control Solutions Company and mTouch are
registered trademarks of Microchip Technology Incorporated
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Analog-for-the-Digital Age, BodyCom, chipKIT, chipKIT logo,
CodeGuard, dsPICDEM, dsPICDEM.net, ECAN, In-Circuit
Serial Programming, ICSP, Inter-Chip Connectivity, KleerNet,
KleerNet logo, MiWi, MPASM, MPF, MPLAB Certified logo,
MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code
Generation, PICDEM, PICDEM.net, PICkit, PICtail,
RightTouch logo, REAL ICE, SQI, Serial Quad I/O, Total
Endurance, TSHARC, USBCheck, VariSense, ViewSpan,
WiperLock, Wireless DNA, and ZENA are trademarks of
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SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
Silicon Storage Technology is a registered trademark of
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GestIC is a registered trademarks of Microchip Technology
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All other trademarks mentioned herein are property of their
respective companies.
© 2015, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
ISBN: 978-1-63277-243-5
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CERTIFIEDꢀBYꢀDNVꢀ
Microchip received ISO/TS-16949:2009 certification for its worldwide
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devices, Serial EEPROMs, microperipherals, nonvolatile memory and
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and manufacture of development systems is ISO 9001:2000 certified.
== ISO/TSꢀ16949ꢀ==ꢀ
DS20005394A-page 14
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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
Fax: 317-773-5453
Los Angeles
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Kaohsiung
Tel: 886-7-213-7828
Taiwan - Taipei
Tel: 886-2-2508-8600
Fax: 886-2-2508-0102
New York, NY
Tel: 631-435-6000
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
San Jose, CA
Tel: 408-735-9110
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Canada - Toronto
Tel: 905-673-0699
Fax: 905-673-6509
01/27/15
DS20005394A-page 15
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