RDK-252 Power Integrations, RDK-252 Datasheet - Page 5

• Manufacturer Part Number: RDK-252
• Description: KIT REF DESIGN DG CAPZERO
• Manufacturer: Power Integrations
• Series: CAPZero™r
• Type: Other Power Managementr

Specifications of RDK-252

• Main Purpose: Automatic X Capacitor Discharge
• Embedded: No
• Utilized Ic / Part: CAP014DG, CAP002DG, CAP012DG
• Primary Attributes: Low No-Load Input Power (
• Secondary Attributes: Surge Testing to EN6100-4-5 Class 4
• Input Voltage: 85 V to 264 V
• Board Size: 38.1 mm x 25.4 mm
• Product: Power Management Modules
• Dimensions: 38.1 mm x 25.4 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: CAP014DG
• Other names: 596-1313

Step 2 – Enter TOPSwitch-JX Variables:
Device, Current Limit, V
TOPSwitch-JX Device
First, refer to the TOPSwitch-JX power table and select a device
based on the peak output power design. Then compare the
continuous power to adapter column numbers in the power
table, if the power supply is of fully enclosed type, or compare to
the open-frame column if the power supply is an open-frame
design. If the continuous power exceeds the value given in the
power table (Table 1), then the next largest device should be
selected. Similarly, if the continuous power is close to the
adapter power levels given in the power table, then it may be
necessary to switch to a larger device based on the measured
thermal performance of the prototype.
External Current Limit Reduction Factor, KI
The factor KI sets the value of the current limit threshold. This
allows the current limit level to be adjusted slightly above the
minimum peak current (I
optimizes the transformer design by limiting the peak flux density
(BP) during overload and start-up.
For higher efficiency and improved thermal performance, KI also
allows the selection of a larger TOPSwitch-JX device to be used
than required for power delivery by reducing KI, such that the
current limit of the larger device is equal to the original smaller
part selected.
High Line Operating Mode
This parameter confirms the mode of operation of the
TOPSwitch-JX at high line. It is desirable to operate in full-
frequency mode at high line as the switching frequency jitter
feature will be enabled. (See TOPSwitch-JX data sheet for an
explanation of operating modes). This provides improved EMI
performance.
Reflected Output Voltage, V
This parameter is the secondary winding voltage during diode
conduction, reflected back to the primary through the turns ratio
of the transformer. The default value is 135 V; however the
acceptable range for V
that no warnings in the spreadsheet are triggered. For design
optimization purposes, the following trade-offs should be
considered:
Figure 5. TOPSwitch-JX Section of Design Spreadsheet.
www.powerint.com
ENTER TOPSWITCH-JX VARIABLES
TOPSwitch-JX
Chosen Device
KI
ILIMITMIN_EXT
ILIMITMAX_EXT
Frequency (F)=132kHz, (H)=66kHz
fS
fSmin
fSmax
High Line Operating Mode
VOR
VDS
VD
VDB
KP
AN-47
OR
P
) required for power delivery. This
is between 80 V and 135 V, provided
OR
, V
OR
DS
(V)
, V
D
, Select the Correct
TOP266E
135.00
0.53
0.50
0.70
0.50
F
TOP266E
Power Out
F
FF
132000 Hertz
119000 Hertz
145000 Hertz
1.257 Amps
1.446 Amps
10 Volts
Universal / Peak
40 W / 86 W
Volts
Volts
Volts
1. Higher V
2. Higher V
3. Higher V
4. Higher V
Optimal selection of the V
application and is based on a compromise between the factors
mentioned above.
For lower voltage outputs (approximately 5 V or multiple output
designs) a lower V
better suited. For higher voltage outputs (12 V and above) a
higher V
Values below 80 V are not usually recommended. Low V
cause excessive triggering of the MOSFET self-protection feature
during start-up, especially in designs where all outputs are >5 V
(see Table 4 for a summary).
TOPSwitch-JX ON-State DRAIN to SOURCE Voltage, V
This parameter is the average ON state voltage developed
across the DRAIN and SOURCE pins of TOPSwitch-JX. By
default, if the grey override cell is left empty, a value of 10 V is
assumed. Use the default value if no better data is available.
Output Diode Forward Voltage Drop, V
Enter the average forward voltage drop of the (main) output diode.
Use 0.5 V for a Schottky diode or 0.7 V for a PN diode if no
better data is available. By default, a value of 0.5 V is assumed.
Bias Winding Diode Forward Voltage Drop, V
Enter the average forward voltage drop of the bias winding
output diode. Use 0.7 V for a PN diode.
Ripple to Peak Current Ratio, K
Figure 6 shows K
K
P
is the ratio of ripple to peak primary current.
minimizes the input capacitance value and maximizes power
delivery from a given TOPSwitch-JX device.
which in some cases may allow the use of a lower forward
drop Schottky diode for higher efficiency.
clamp losses that reduces efficiency of the power supply and
degrade cross regulation in multiple output designs.
ary side, which may increase secondary side copper and
diode losses.
115 Doubled/230V
60W
External Ilimit reduction factor (KI=1.0 for default ILIMIT, KI <1.0 for lower ILIMIT)
Use 1% resistor in setting external ILIMIT
Use 1% resistor in setting external ILIMIT
Select 'H' for Half frequency - 66kHz, or 'F' for Full frequency - 132kHz
TOPSwitch-JX Switching Frequency: Choose between 132 kHz and 66 kHz
TOPSwitch-JX Minimum Switching Frequency
TOPSwitch-JX Maximum Switching Frequency
Full Frequency, Jitter enabled
Reflected Output Voltage
TOPSwitch on-state Drain to Source Voltage
Output Winding Diode Forward Voltage Drop
Bias Winding Diode Forward Voltage Drop
Ripple to Peak Current Ratio (0.3 < KRP < 1.0 : 1.0< KDP<6.0)
OR
of approximately 120 and 135 V is better suited.
OR
OR
OR
OR
allows increased power delivery at V
reduces the voltage stress on the output diodes,
can increase leakage inductance and increase
increases peak and RMS current on the second-
P
OR
< 1, indicating continuous conduction mode,
of approximately 100 V - 110 V is usually
OR
value depends on the specific
Application Note
P
D
(V)
DB
MIN
(V)
, which
Rev. A 030910
OR
DS
5
may
(V)