RDR-131 POWERINT [Power Integrations, Inc.], RDR-131 Datasheet - Page 12

• Manufacturer Part Number: RDR-131
• Description: Reference Design Report for 3 W Non- Isolated Constant Current LED Driver Using LNK306DN
• Manufacturer: POWERINT [Power Integrations, Inc.]

6
ACDC_LinkSwitch-
TN_030906; Rev.2.2;
Copyright Power
Integrations 2006
INPUT VARIABLES
VACMIN
VACMAX
FL
VO
IO
EFFICIENCY (User
Estimate)
EFFICIENCY (Calculated
Estimate)
CIN
Input Stage Resistance
Ambient Temperature
Switching Topology
Input Rectification Type
DC INPUT VARIABLES
VMIN
VMAX
LinkSwitch-TN
LinkSwitch-TN
ILIMIT
ILIMIT_MIN
ILIMIT_MAX
FSMIN
VDS
PLOSS_LNK
DIODE
VD
VRR
IF
TRR
Diode Recommendation
OUTPUT INDUCTOR
L_TYP
L
L_R
OPERATING MODE
KL_TOL
K_LOSS
ILRMS
PI Xls Design Spreadsheet
Power Integrations, Inc.
Tel: [phone] Fax: [phone]
www.powerint.com
INPUT INFO OUTPUT UNIT LinkSwitch-TN_Rev_2-2.xls: LinkSwitch-TN Design
F
Auto
12.00
0.330
0.72
9.40
265
85
50
62000
374.8
0.482
0.450
0.515
941.6
0.813
Buck
1000
CCM
0.78
9.40
0.00
79.1
0.51
0.70
1.15
0.33
600
6.2
2.0
50
35
BYV26C Suggested Freewheeling Diode
F
LNK306 Selected LinkSwitch-TN
1
Amps
Amps
Amps
Amps
Watts
Amps
Amps
Hertz
ohms
Hertz
Volts
Volts
Volts
Volts
Volts
Volts
Volts
Volts
Ohm
deg
uH
uH
uF
ns
C
s
Spreadsheet
Customer
Minimum AC Input Voltage
Maximum AC Input Voltage
Line Frequency
Output Voltage
Output Current
Overall Efficiency Estimate (Adjust to match Calculated,
or enter Measured Efficiency)
Calculated % Efficiency Estimate
Input Filter Capacitor
Input Stage Resistance, Fuse & Filtering
Operating Ambient Temperature (deg Celsius)
Type of Switching topology
Choose H for Half Wave Rectifier and F for Full Wave
Rectification
Minimum DC Bus Voltage
Maximum DC Bus Voltage
Typical Current Limit
Minimum Current Limit
Maximum Current Limit
Minimum Switching Frequency
Maximum On-State Drain To Source Voltage drop
Estimated LinkSwitch-TN losses
Freewheeling Diode Forward Voltage Drop
Recommended PIV rating of Freewheeling Diode
Recommended Diode Continuous Current Rating
Recommended Reverse Recovery Time
Required value of Inductance to deliver Output Power
(Includes device and inductor tolerances) Choose next
higher standard available value
Output Inductor, Recommended Standard Value
DC Resistance of Inductor
Continuous Conduction Mode (at VMIN)
Inductor tolerance Factor. Accounts for basic (10% -
20%) Manufacturing Tolerances 1.1 < KL_TOL < 1.2
See AN-37 for detailed explanation
Loss factor. Accounts for "off-state" power loss to be
supplied by inductor Calculated efficiency < K_LOSS <
1. See AN-37 for detailed explanation
Estimated RMS inductor current (at VMAX)
Page 12 of 24