DER-92
更新时间：2024-09-18 05:51:56
品牌：POWERINT
描述：0.5W Non-Isolated Buck-Boost Converter using the LNK302P
概述
数据手册DER-92 概述
0.5W Non-Isolated Buck-Boost Converter using the LNK302P 0.5W非隔离使用LNK302P降压 - 升压型转换器
DER-92 数据手册
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PDF下载Design Example Report
0.5W Non-Isolated Buck-Boost Converter
using the LNK302P
Title
Input: 85-265 VAC
Output: 0.5W, 40mA Constant current
Specification
Application
Author
LED Driver
Power Integrations Applications Department
Document
Number
DER-92
Date
August 11, 2005
1.0
Revision
Summary and Features
• Low component count (only 9 components required)
• Low Cost, light weight, compact solution
• No Opto-Coupler required
• Open loop operation
• High efficiency (~70%)
• Meets EN55022 B EMI limits with > 8 dB margin
The products and applications illustrated herein (including circuits external to the products and transformer
construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign
patent applications assigned to Power Integrations. A complete list of Power Integrations’ patents may be found at
www.powerint.com.
Power Integrations
5245 Hellyer Avenue, San Jose, CA 95138 USA.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
Table Of Contents
1
2
3
4
Introduction.................................................................................................................3
Power Supply Specification ........................................................................................4
Schematic...................................................................................................................5
Circuit Description.......................................................................................................6
4.1
Input EMI Filtering................................................................................................6
LinkSwitch-TN .....................................................................................................6
Output Rectification .............................................................................................6
Circuit Operation..................................................................................................6
4.2
4.3
4.4
5
6
7
8
PCB Layout.................................................................................................................7
Bill Of Materials...........................................................................................................8
Spreadsheet ...............................................................................................................9
Performance Data.....................................................................................................10
8.1
Efficiency ...........................................................................................................10
9
Waveforms................................................................................................................10
9.1
9.2
10
11
Drain Voltage and Current, Normal Operation...................................................10
Output Current, Normal operation......................................................................11
Conducted EMI .....................................................................................................12
Revision History ....................................................................................................13
Important Note:
Although this board is designed to satisfy safety isolation requirements, the engineering
prototype has not been agency approved. Therefore, all testing should be performed
using an isolation transformer to provide the AC input to the prototype board.
Design Reports contain a power supply design specification, schematic, bill of materials,
and transformer documentation. Performance data and typical operation characteristics
are included. Typically only a single prototype has been built.
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Page 2 of 14
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DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
1 Introduction
This document is an engineering report describing a 0.5 W constant current LED driver
power supply utilizing a LNK302P. This power supply is intended as a LED driver that
can be used in emergence exit signs and neon light replacements
The document contains the power supply specification, schematic, bill of materials,
printed circuit layout, and performance data.
Figure 1 - Populated Circuit Board Photograph
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DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
2 Power Supply Specification
Description
Symbol
Min
Typ
Max
Units
Comment
Input
2 Wire – no P.E.
Voltage
Frequency
No-load Input Power (230 VAC)
VIN
fLINE
85
47
265
64
VAC
Hz
W
50/60
-
Output
± 5%
Output Voltage 1
Output Ripple Voltage 1
Output Current 1
VOUT1
VRIPPLE1
IOUT1
13
40
V
mV
mA
20 MHz bandwidth
Total Output Power
Continuous Output Power
Peak Output Power
POUT
POUT_PEAK
0.5
0.5
W
W
Efficiency
Full Load
Measured at POUT 25 oC
70
%
η
Environmental
Meets CISPR22B / EN55022B
Conducted EMI
Designed to meet IEC950, UL1950
Class II
Safety
1.2/50 µs surge, IEC 1000-4-5,
Series Impedance:
Surge
kV
Differential Mode: 2 Ω
Common Mode: 12 Ω
100 kHz ring wave, 500 A short
circuit current, differential and
common mode
Surge
kV
Free convection, sea level
Ambient Temperature
TAMB
0
25
50
oC
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Page 4 of 14
DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
3 Schematic
Figure 2 - Schematic
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Page 5 of 14
DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
4 Circuit Description
This is a very simple circuit, which requires as few as 9 components. An additional input
diode may be placed on the return leg for EMI and surge withstand capability
4.1 Input EMI Filtering
Resistors RF1, RF2 and capacitors C1 and C2 form the EMI filter. C1 C2 and RF2 are
connected to form a low cost resistive π filter and provide excellent differential mode
filtering and also serve as the stable DC bus voltage. Resistor RF1 is a fusible flameproof
type while RF2 can be only flameproof.
4.2 LinkSwitch-TN
LNK302P is used in open loop mode for this circuit. This particular device in the
LinkSwitch-TN family does not have the auto restart feature, and thus when the
feedback pin is left open, the MOSFET switches every cycle until current limit (or duty
cycle limit) is reached.
4.3 Output Rectification
Since this circuit operates strictly in the discontinuous conduction mode (DCM) a 75 nS
recovery time UF4005 diode is used for output rectification. The buck boost topology also
provides benefits of isolating the output from the input in case of Switch failure
4.4 Circuit Operation
This LED driver operates at 66 kHz and energy is provided to the LED’s every switching
cycle. Since the circuit operates in discontinuous mode, a fixed amount of energy is
stored each cycle in L2, then is completely transferred to the load (i.e. the LEDs). The
current in the LED is a triangular waveform, whose peak is determined by the fixed and
well-controlled current limit of the LNK302. The load current is thus independent of line
voltage. As such the need for output filter capacitor is completely eliminated.
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Page 6 of 14
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DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
5 PCB Layout
Figure 3 - Printed Circuit Layout
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Page 7 of 14
DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
6 Bill Of Materials
Item Quantity Reference Part
Description
Manufacturer
UCC
400 V input
capacitors
1
2
3
4
5
2C1,C2
1C3
2.2 uF
0.1 uF, 50 V (ECU- Bypass pin
S1H104KBB)
capacitor
Panasonic
Input rectifier Diodes Inc (or
diode Generic)
Output rectifier Gen Semiconductor
1D1
1N4007
1D3
UF4005
diode
(or generic)
AC Input
connector
2J1,J2
CON1
Generic
Super bright
White LED's
1 mH inductor Tokin
6
7
12LED1,...12 5mm
OSRAM
1L2
SBC1-102-211
1W, Fusible
8
9
1RF1
1RF2
1U1
8.2 Ohm 1W
47 Ohm, Flameproof Flameproof
and Flameproof VTM
VTM
10
LNK302P LinkSwitch-TN Power Integrations
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Page 8 of 14
DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
7 Spreadsheet
ACDC_LinkSwitch-TN_BuckBoost_042605;
Rev.2.0; Copyright Power Integrations 2004 INPUT
LinkSwitch-TN_BuckBoost_Rev2-0.xls: LinkSwitch-TN
Design Spreadsheet
INFO
OUTPUT UNIT
Volts
INPUT VARIABLES
VACMIN
Customer
Minimum AC Input Voltage
85
VACMAX
265
50
12.50
0.035
Volts Maximum AC Input Voltage
FL
VO
IO
Hertz Line Frequency
Volts Output Voltage
Amps Output Current
Overall Efficiency Estimate (Adjust to match Calculated, or enter
EFFICIENCY (User Estimate)
EFFICIENCY (Calculated Estimate)
CIN
Input Stage Resistance
Ambient Temperature
Input Rectification Type
0.75
Measured Efficiency)
Calculated % Efficiency Estimate
0.65
4.40
8.2
50
4.40
8.2
uF Input Filter Capacitor
ohms Input Stage Resistance, Fuse & Filtering
Operating Ambient Temperature (deg Celcius)
deg C
Choose H for Half Wave Rectifier and F for Full Wave Rectification
H
H
DC INPUT VARIABLES
VMIN
99.7
374.8
Volts Minimum DC Bus Voltage
Volts Maximum DC Bus Voltage
VMAX
LINKSWITCH-TN
LINKSWITCH-TN
ILIMIT
ILIMIT_MIN
ILIMIT_MAX
FSMIN
LNK302
0.136
0.136
0.146
66000
12.0
Selected LinkSwitch-TN
Amps Typical Current Limit
Amps Minimum Current Limit
Amps Maximum Current Limit
Hertz Minimum Switching Frequency
Volts Maximum On-State Drain To Source Voltage drop
Watts Estimated LinkSwitch-TN losses
VDS
PLOSS_LNK
0.20
DIODE
VD
VRR
IF
0.70
600
1
Volts Freewheeling Diode Forward Voltage Drop
Recommended PIV rating of Freewheeling Diode
Volts
Recommended Diode Continuous Current Rating
Amps
TRR
75
ns Recommended Reverse Recovery Time
Suggested Freewheeling Diode
Diode Recommendation
UF4005
OUTPUT INDUCTOR
Required value of Inductance to deliver Output Power (Includes device
uH and inductor tolerances) Choose next higher standard available value
L_TYP
989.2
L
L_R
1000
2.0
uH Output Inductor, Recommended Standard Value
Ohms DC Resistance of Inductor
OPERATING MODE
DCM
Discontinuous Conduction Mode (at VMIN)
KL_TOL
1.15
K_LOSS
ILRMS
0.833
0.06
Amps Estimated RMS inductor current (at VMAX)
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Page 9 of 14
DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
8 Performance Data
All measurements performed at room temperature, 60 Hz input frequency.
8.1 Efficiency
Efficiency Vs Line Voltage
80
79
78
77
76
75
74
73
72
71
70
50
100
150
200
250
300
Line Voltage (V)
Figure 4 - Efficiency Vs Line Voltage
9 Waveforms
9.1 Drain Voltage and Current, Normal Operation
Figure 5 - 85 VAC, Full Load.
Upper: IDRAIN, 50 mA / div
Lower: VDRAIN, 50 V, 5 µs / div
Figure 6 - 265 VAC, Full Load
Upper: IDRAIN, 50 mA / div
Lower: VDRAIN, 200 V / div, 2 µs / div
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Page 10 of 14
DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
9.2 Output Current, Normal operation
Figure 7 - 115VAC
Figure 8 - Start-up Profile, 230 VAC
50 ms / div. 2 µs / div
50 ms / div. 5 µs / div
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Page 11 of 14
DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
10 Conducted EMI
Figure 9 - Conducted EMI, Maximum Steady State Load, foreground shows 230 VAC, background shows
115 VAC, 60 Hz, and EN55022 B Limits.
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DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
11 Revision History
Date
Author Revision Description & changes
1.0 First Draft
Reviewed
AM / VC
August 11, 2005 SK
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Page 13 of 14
DER-92
0.5W, 40mA, Open Loop LED Driver
August 11, 2005
For the latest updates, visit our website: www.powerint.com
Power Integrations may make changes to its products at any time. Power Integrations has no liability arising from your use of any
information, device or circuit described herein nor does it convey any license under its patent rights or the rights of others. POWER
INTEGRATIONS MAKES NO WARRANTIES HEREIN AND SPECIFICALLY DISCLAIMS ALL WARRANTIES
INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS.
PATENT INFORMATION
The products and applications illustrated herein (including circuits external to the products and transformer construction) may be
covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign patent applications assigned to Power
Integrations. A complete list of Power Integrations’ patents may be found at www.powerint.com.
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