RDK-251 Power Integrations, RDK-251 Datasheet - Page 14

• Manufacturer Part Number: RDK-251
• Description: KIT REF DESIGN FOR LNK457D
• Manufacturer: Power Integrations
• Series: LinkSwitch®-PLr

Specifications of RDK-251

• Current - Output / Channel: 350mA
• Outputs And Type: 1, Isolated
• Voltage - Output: 12 ~ 18 V
• Features: Dimmable
• Voltage - Input: 90 ~ 265VAC
• Utilized Ic / Part: LNK457D
• Output Voltage: 12 V
• Input / Supply Voltage (max): 265 VAC
• Input / Supply Voltage (min): 90 VAC
• Duty Cycle (max): 39.9 %
• Mounting Style: Through Hole
• Output Current: 350 mA
• Output Power: 5 W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 596-1345

7 Transformer Design Spreadsheet
ACDC_LinkSwitch-PL-
Flb_042910; Rev.1.0;
Copyright Power
Integrations 2010
ENTER APPLICATION VARIABLES
VACMIN
VACMAX
FL
VO_MAX
VO_MIN
IO
N
Z
Enclosure
PO
VD
LinkSwitch-PL DESIGN VARIABLES
Device
VOR
Turns Ratio
TON
FSW
Duty Cycle
VDRAIN
IRMS
IPK
Power Integrations, Inc.
Tel: [phone] Fax: [phone]
www.powerint.com
LNK457
INPUT
Frame
Open
0.35
265
0.7
0.7
85
50
18
INFO
Open Frame
OUTPUT
LNK457
0.350
120.7
122.1
0.154
0.595
10.0
6.30
3.27
39.9
265
620
0.7
0.7
0.7
6.5
85
50
18
%/100
UNIT
kHz
Hz
us
W
%
V
V
V
V
A
V
V
V
A
A
ACDC_LinkSwitch-PL_Flb_042910;
LinkSwitch-PL Flyback Transformer
Design Spreadsheet
5 W Dimmable Power Factor Corrected
LED Driver (Non-Isolated) Using
LinkSwitch-PL LNK457DG
Minimum AC input voltage
Maximum AC input voltage
Minimum line frequency
Maximum Output Voltage
Minimum output voltage before device
operates in cycle skipping at VACMAX
Average output current
Total power supply efficiency
Loss allocation factor. Larger value of Z
means losses are more on secondary
side, smaller value of Z means more
losses on primary side.
Enclosure selections determines thermal
conditions and maximum power
Average output power
Output diode forward voltage drop
Chose device PO max in Open Frame:
7.357W, PO Max in Retrofit Lamp:
6.893125 W.
Reflected output voltage
Primary to secondary turns ratio
Expected on-time of MOSFET at low line
and PO
Expected switching frequency at low
line and PO
Expected operating duty cycle at low
line and PO
Estimated drain voltage
Primary RMS current
Peak primary current
Page 14 of 60