RDK-249 Power Integrations, RDK-249 Datasheet - Page 21

• Manufacturer Part Number: RDK-249
• Description: KIT REF DESIGN PFS762HG
• Manufacturer: Power Integrations
• Series: HiperTFS®r

Specifications of RDK-249

• Main Purpose: Reference Design, PC Power Supply
• Embedded: No
• Utilized Ic / Part: TFS762HG
• Primary Attributes: 12V 25A, 5V 2.9A Outputs, 300 ~ 385 VDC Input
• Output Voltage: 5 V
• Input / Supply Voltage (max): 385 VDC
• Input / Supply Voltage (min): 300 VDC
• Duty Cycle (max): 50 %
• Mounting Style: Through Hole
• Output Current: 2.9 A
• Output Power: 14.5 W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Other names: 596-1398

10 Transformer Design Spreadsheet
(Note – Output current is made 4.20 A in the spreadsheet to account for load on the auxiliary output)
Page 21 of 48
HiperTFS MAIN OUTPUT (TWO-SWITCH FORWARD STAGE)
OUTPUT VOLTAGE AND CURRENT
VMAIN
IMAIN
VOUT2
IOUT2
POST REGULATED OUTPUT
Post Regulator
V_SOURCE
VOUT3
IOUT3
n_PR
COUPLED-INDUCTOR (LOW POWER) DERIVED OUTPUT
VOUT4
IOUT4
POUT(Main)
POUT_PEAK(Main)
POUT(Standby)
POUT_PEAK(Standby)
POUT(System Total)
POUT_PEAK(System Total)
VBIAS
INPUT VOLTAGE AND UV/OV
CIN
T_HOLDUP
VMIN
VNOM
VMAX
UV / OV / UVOV
VUV OFF
VUV ON
VOV ON
VOV OFF
RR
RL
ENTER DEVICE VARIABLES
Device
Chosen Device
ILIMIT_MIN
ILIMIT_TYP
ILIMIT_MAX
fSMIN
fS
switch_Forward_092110
Power Integrations 2010
; Rev.1.04; Copyright
HiperTFS_Two-
TFS762
340.00
INPUT
NONE
12.00
25.00
12.00
17.00
0.10
4
236.0
300.0
480.4
664.5
INFO
Info
min
OUTPUT
TFS762
269.92
61500
66000
301.2
340.0
311.5
20.00
287.9
344.7
10.3
14.5
4.00
4.00
3.25
3.50
3.75
max
300
380
420
0.0
0.0
1
-
-
Tel: [phone] Fax: [phone]
M-ohm
M-ohm
UNIT
ms
uF
Hz
Hz
W
W
W
W
W
W
V
A
V
A
V
V
A
V
A
V
V
V
V
V
V
V
V
A
A
A
Main output voltage
Main output current
Output2 voltage
Output2 current
!!!! Info. No Selection for post-regulator -
select 'NONE' if not using post-regulator
Select source of input voltage for post
regulator
Enter postregulator output voltage
Enter post rehulator output current
Enter postregulator efficiency (Buck only)
Coupled-Inductor derived (low power) output
voltage (typically -12 V)
Coupled-Inductor derived (low power) output
current
Total output power (Main converter)
Peak Output power(Main converter). If there
is no peak power requirement enter value
equal to continuous power
Continuous output power from Standby
power supply
Peak output power from Standby section
Total system continuous output power
Total system peak output power
DC bias voltage from main transformer aux
winding
Input Capacitance. To increase CMIN,
increase T_HOLDUP
Holdup time
Minimum input voltage to guarantee output
regulation
Nominal input voltage
Maximum DC input voltage
Minimum undervoltage On-Off threshold
Maximum undervoltage Off-On threshold
(turn-on)
Minimum overvoltage Off-On threshold
Minimum overvoltage On-Off threshold (turn-
off)
R pin resistor
Line Sense resistor value (L-pin) - goal seek
(VUV OFF) for std 1% resistor series
Selected HiperTFS device
Device current limit (Minimum)
Device current limit (Typical)
Device current limit (Maximum)
Device switching frequency (Minimum)
Device switching frequency (Typical)
HiperTFS_092110 Two-switch Forward
Transformer Design Spreadsheet
Power Integrations
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