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CRCW0402100KFKED Datasheet(PDF) 2 Page - Vishay Siliconix

Part # CRCW0402100KFKED
Description  Selectable frequency from 200 kHz to 1 MHz with an external resistor
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Manufacturer  VISHAY [Vishay Siliconix]
Direct Link  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

CRCW0402100KFKED Datasheet(HTML) 2 Page - Vishay Siliconix

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SiC401, SiC402, SiC403
www.vishay.com
Vishay Siliconix
Revision: 17-Nov-14
2
Document Number: 62923
For technical questions, contact: powerictechsupport@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
SPECIFICATIONS
This reference board allows the end user to evaluate the
SiC401, SiC402, or the SiC403 chip for its features and all
functionalities.
It can also be a reference design for a user’s application.
CONNECTION AND SIGNAL / TEST POINTS
Power Sockets
VIN, GND (P1): Input voltage source with VIN to be positive.
Connect to a voltage source:
- SiC401A/BCD - 3 V to 17 V
- SiC402A/BCD - 3 V to 28 V
- SiC403A/BCD - 3 V to 28 V
VOUT, GND (P3): Output voltage with VOUT to be positive.
Connect to a load that draws no more than:
• SiC401A/BCD - 15 A
• SiC402A/BCD - 10 A
• SiC403A/BCD - 6 A
5 V, GND (P5): External 5 V voltage source with 5 V to be
positive. Connect to a 5 V source when this option is
selected.
SELECTION JUMPERS
Mode Select
P7: This is a 2 way header which allows the user to select
either power save mode or constant PWM mode.
OPEN - forced PWM, the pin is floating
SHORT - power save mode, the pin is at 5 V
A third option is available whereby pin 2 is shorted to 0 V to
disable the part.
UVLO Option
P8: This is a 2 way header that will enable the UVLO function
when selected. The divider resistors R1 and R2 can be
changed depending on the required turn on voltage level,
the pin requires a voltage greater than 3 V to enable.
OPEN - UVLO disabled
SHORT - UVLO enabled
VDD Select
P6: This is a 3 way header that will enable the user to select
between internal LDO and an external 5 V supply.
Position 1 - SHORT PIN 1-2 - internal LDO
Position 2 - SHORT PIN 2-3 - external 5 V
SIGNALS AND TEST LEADS
Input Voltage Sense
VIN_SENSE, GNDIN_SENSE (P2): This allows the user to
measure the voltage at the input of the regulator and remove
any losses generated due to the, connections from the
measurement. This can also be used by a power source with
sense capability.
Output Voltage Sense
VOUT_SENSE, GNDOUT_SENSE (P4): This allows the user to
measure the voltage at the output of the regulator and
remove any losses generated due to the connections, from
the measurement. This can also be used by an active load
with sense capability.
PGD (P9): Is an open drain output and is pulled up with a
10 k
Ω resistor to VIN. When FB or VOUT are within -10 % to
+20 % percent of the set voltage this pin will go HI to
indicate the output is okay. The pin will also follow EN/PSV
condition switching LO if the IC is disabled.
POWER UP PROCEDURE
To turn-on the reference board, apply 12 V to VIN with the
P6 jumper is in Position 1. If the P7 jumper is in place the
board will come up in power save mode, if not in place then
constant PWM will be observed.
When applying higher than 12 V to the input it is reasonable
to install a RC snubber from LX to GND. There are place
holders on the reference board R9 and C11 for the snubber.
Values of 10
Ω and 1 nF are a reasonable starting point.
ADJUSTMENTS TO THE REFERENCE BOARD
OUTPUT VOLTAGE ADJUSTMENT
If a different output voltage is needed, simply change the
value of VOUT and solve for R12 based on the following
formula:
Where VFB is 0.6 V for the SiC40X.
CHANGING SWITCHING FREQUENCY
The following equation illustrates the relationship between
ON-time, VIN, VOUT, and RON value:
Where k equals 1 when VDD is greater than 3.6 V. When k is
less than 3.6 V and VIN is greater than ((VDD - 1.75 V) x 10),
k is shown by the following equation:
The maximum Rton value allowed is shown:
R
12 = R13 x
V
OUT - VFB
V
FB
-----------------------------
R
tON =
k
25 pF x F
SW
---------------------------------
k =
V
DD - 1.75 V
() x 10
V
IN
----------------------------------------------------
R
tON MAX. =
V
IN min.
15 μA
------------------


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