Y5117P Datasheet, PDF (13/14 Pages) Power-One – 3.0V to 13.2V Input 0.7V to 3.63V Output

Y5117 17A DC-DC POL Data Sheet
3.0V to 13.2V Input • 0.7V to 3.63V Output
A4.3 Default Settings / User Adjustments of SW1,
SW2, SW3 and Optional Components
To activate device (ENABLE), set SW2 Pin 7 to OFF
position, to disable the unit set Pin 7 to ON.
When operating from an input voltage higher than
5.2V, SW3 Pin 2 should be set to ON. Otherwise,
SW3 Pin 1 should be set to OFF and an external
voltage source higher than 5.2V needs to be
connected to V_LDO pins (P9 and P10 in the
schematic). This voltage must not exceed 15V and
be capable of supplying 60mA.
To adjust OCP (overcurrent protection) value (default
~22A) set SW1 Pin 1 and Pin 2 to ON position, then
place a 0805 resistor on pad R17 and a 0805
capacitor on pad C11. Refer to the OCP adjustment
section of the data sheet for the required value of the
resistor and the capacitor.
The output voltage of 1.3V (factory default) requires
SW2 Pins 1 to 6 to be switched OFF.
To change the output voltage to 3.3V, 2.5V, 1.8V, or
1.5V, a single switch needs to be set ON of SW2
Pins 6 to 3 respectively.
NOTE: only one switch from Pin 6 to Pin 1 can be set
ON at any one time.
If a voltage higher than 1.3V not referred to above is
required, then set SW2 Pin 6 to ON and replace R11
and/or R6 with resistors required to achieve the
desired output. Refer to the output voltage
adjustment section of the data sheet for value of
resistor(s) required.
To achieve an output voltage of less than 1.3V, SW3
Pin 1 is set to ON, then 0.7V or 1.0V can be selected
with SW2, Pin 1 or 2 respectively.
If a voltage lower than 1.3V not referred to above is
required, then set SW3 Pin 1 to ON, SW2 pin 1 to
ON and replace resistors R14 and/or R01 with
resistors required to achieve the desired output.
Refer to the output voltage adjustment section of the
data sheet for value of resistor(s) required.
External reference voltage can be used to increase
accuracy of the output voltage settings. Set SW3 Pin
1 to OFF and connect the external reference voltage
to V Ref Ext pins (P13 and P14).
A4.4 Turn-on Procedure
Set the input power supply OVP (overvoltage
protection) to 15V to ensure no damage to the
Y5117P on the evaluation board will occur. Ensure
the input voltage sense leads are connected to the
evaluation board terminals to provide proper
regulation and input voltage stability.
Start the input power supply at no load and 0V and
increase voltage to desired input voltage, then turn on
load (preferably half load initially).
In normal operation, the Y5117P is powered from a
12V front end or high-grade benches supply, with
minimal lead or track length. If the output impedance
of the input source is too high for the test setup, then
the unit may fail to start. A low impedance (Low
ESR) capacitor is then recommended between Vin
and Pgnd for optimum setup (as close to Vin as
possible).
A4.5 Measurements
Input voltage measurements should be taken at Vin
sense pins (+ & -) to improve accuracy. Output
voltage should be measured at Vo sense pins (+ & -).
Standard shunts should be used for current
measurements.
Noise is measured on BNC with a standard scope
lead (50 Ohm) 20MHz bandwidth.
Minimize all lead lengths for input and output (to
reduce impedance).
Capacitors C01, C10 and C12 are optional and used
only for the evaluation board test setup and
measurements (transients, etc.).
REV. 2.6 APR 07, 2005
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