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YV12T25 DC-DC Converter
10 - 14 VDC Input; 0.8 - 5.5 VDC Programmable @ 25 A
Data Sheet
Output Voltage Programming
The output voltage can be programmed from
0.8 V to 5.5 V by connecting an external resistor
(R TRIM ) between SENSE(+) pin (Pin 1) and Vout pin
(see Fig. C).If the R TRIM is not used and SENSE(+) is
shorted to Vout, the output voltage of the module will
be 0.7887V. If the SENSE(+) is not connected to the
Vout, the output of the module will reach overvoltage
shutdown. A 1 μ F multilayer ceramic capacitor is
required from R TRIM to SENSE(-) pin to minimize
noise.
A trim resistor, R TRIM , for a desired output voltage
can be calculated using the following equation:
V 0-REG [V]
0.8
1.0
1.2
1.5
1.8
2.0
2.5
3.3
5.0
Overvoltage
Shutdown
R TRIM [ ? ]
11
208
404
699
994
1190
1682
2468
4138
Open
? V O ? REQ
R
TRIM
?? 775 ? ?
? 0.7887
?
? 1 ?
?
[ ? ]
Table 1 : Trim Resistor Values
Protection Features
where,
R TRIM ? Required value of trim resistor [ ? ]
V O ? REQ ? Desired (trimmed) output voltage [V]
Fig. C: Configuration for programming output voltage.
Note that the tolerance of a trim resistor directly
affects the output voltage tolerance. It is
recommended to use standard 1% or 0.5% resistors;
for tighter tolerance, two resistors in parallel are
recommended rather than one standard value from
Table 1.
Input Undervoltage Lockout
Input undervoltage lockout is standard with this
converter. The converter will shut down when the
input voltage drops below a pre-determined voltage;
it will start automatically when Vin returns to a
specified range. .
Output Overcurrent Protection (OCP)
The converter is protected against overcurrent and
short circuit conditions. Upon sensing an overcurrent
condition, the converter will enter hiccup mode. Once
over-load or short circuit condition is removed, Vout
will return to nominal value.
Overtemperature Protection (OTP)
The converter will shut down under an
overtemperature condition to protect itself from
overheating caused by operation outside the thermal
derating curves, or operation in abnormal conditions
such as system fan failure. After the converter has
cooled to a safe operating temperature, it will
automatically restart.
Safety Requirements
The converter meets North American and
International safety regulatory requirements per
UL60950 and EN60950. The maximum DC voltage
between any two pins is Vin under all operating
conditions. Therefore, the unit has ELV (extra low
voltage) output; it meets SELV requirements under
the condition that all input voltages are ELV. The
converter is not internally fused. To comply with
safety agencies’ requirements, a recognized fuse
with a maximum rating of 30 Amps must be used in
series with the input line.
ZD-01983 Rev. 2.1, 25-Jun-10
www.power-one.com
Page 6 of 12
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