DAK-21A Power Integrations, DAK-21A Datasheet - Page 14

• Manufacturer Part Number: DAK-21A
• Description: KIT DESIGN ACCELERATOR DPA SW
• Manufacturer: Power Integrations
• Series: DPA-Switch®r

Specifications of DAK-21A

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Isolated
• Voltage - Output: 5V
• Current - Output: 6A
• Voltage - Input: 36 ~ 72V
• Regulator Topology: Buck
• Frequency - Switching: 400kHz
• Board Type: Fully Populated
• Utilized Ic / Part: DPA423, DPA424, DPA425, DPA426
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

9 PIXls Design Spreadsheet
OUTPUT VOLTAGE AND CURRENT
VMAIN
IMAIN
VOUT2
IOUT2
POUT
VBIAS
INPUT VOLTAGE AND UV/OV
VMIN
VMAX
VUV OFF
VUV ON
VOV ON
VOV OFF
RL
ENTER DPA-Switch VARIABLES
DPA-Switch
Chosen Device
ILIMIT
Frequency - (F)=400kHz,
(L)=300kHz
fS
KI
ILIMITEXT
RX
DUVON GOAL
KDI
VDS
VDSOP
DIODE Vf SELECTION
VDMAIN
VDOUT2
DCDC_DPAFwd_rev1.02_061802
Copyright Power Integrations
Inc. 2002
Power Integrations, Inc.
Tel: [phone] Fax: [phone]
www.powerint.com
dpa424
DPA424
375000
INPUT
2.32
12.0
36
72
30
5
6
1
f
425000
INFO
2.68
30.0
32.2
74.8
min
-
OUTPUT
400000
Power 15.5 W
618.0 kOhm
178.7 Volts
33.1 DC volts
34.6 DC volts
94.6 DC Volts
2.32 Amps
0.71
0.15
max
0.5 Volts
0.5 Volts
30 Watts
2 Volts
- DC volts
- kOhm
Volts
Amps
Volts
Amps
Volts
DC volts
DC volts
16VDC
Amps
Hertz
UNIT
DPA_061802_R102xls: DPA-Switch
Forward Transformer Design
Spreadsheet
EP21 DC-DC Converter
Main output voltage
Main output current
Output2 voltage
Output2 current
Total output power
DC bias voltage from output inductor
winding
Minimum DC input voltage
Maximum DC input voltage
Minimum undervoltage On-Off
threshold
Maximum undervoltage Off-On
threshold (turn-on)
Minimum overvoltage Off-On threshold
Maximum overvoltage On-Off threshold
(turn-off)
Line Sense resistor value (L-pin) - goal
seek (VUV OFF) for std 1% resistor
series
36VDC
35W
From DPA-Switch datasheet
Full (F) frequency option - 400 kHz
From DPA-Switch datasheet
External limit reduction factor (KI=1.0
for default ILIMIT, KI <1.0 for lower
ILIMIT)
External current limit
Current Limit resistor value (X-pin) -
assumes minimum datasheet curve (fig
32)
Maximum allowed duty cycle at VUV
ON MIN undervoltage threshold
Maximum current ripple factor
DPA-Switch average on-state Drain to
Source Voltage
Required drain voltage for guaranteed
transformer reset
Main output diodes forward voltage
drop
Secondary output diodes forward
Page 14 of 32