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YNM12S05 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5 A
V 0-REG [V] R TRIM [k ? ]
The ground pin of the trim resistor should be
connected directly to the converter GND pin with no
voltage drop in between. Table 1 provides the trim
resistor values for popular output voltages.
Table 1: Trim Resistor Value
The Closest
Standard Value [k ? ]
Protection Features
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.
The input voltage must be typically 9.2 V for the
0.7525
1.0
1.2
1.5
1.8
2.0
2.5
3.3
5.0
5.5
open
41.42 41.2
22.46 22.6
13.05 13.0
9.02 9.09
7.42 7.50
5.01 4.99
3.12 3.09
1.47 1.47
1.21 1.21
converter to turn on. Once the converter has been
turned on, it will shut off when the input voltage
drops below typically 8.4 V.
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
overload or short circuit condition is removed, Vout
will return to nominal value.
V CTRL ? 0 . 7 ?
( 1 ? R EXT )(V O - REQ - 0.7525)
The output voltage can also be programmed by
external voltage source. To make trimming less
sensitive, a series external resistor R EXT is
recommended between TRIM pin and programming
voltage source. Control Voltage can be calculated by
the formula:
[V]
15
where
V CTRL ? Control voltage [V]
R EXT ? External resistor between TRIM pin and
voltage source; the k ? value can be chosen
depending on the required output voltage range.
Control voltages with R EXT ? 0 and R EXT ? 15 k ? are
shown in Table 2.
Table 2: Control Voltage [VDC]
V 0-REG [V] V CTRL (R EXT = 0) V CTRL (R EXT = 15 k ? )
0.7525 0.700 0.700
1.0 0.684 0.436
1.2 0.670 0.223
1.5 0.650 -0.097
1.8 0.630 -0.417
2.0 0.617 -0.631
2.5 0.584 -1.164
3.3 0.530 -2.017
5.0 0.417 -3.831
5.5 0.384 -4.364
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 15 Amps must be used in
series with the input line.
Characterization
General Information
The converter has been characterized for many
operational aspects, to include thermal derating
(maximum load current as a function of ambient
temperature and airflow) for vertical and horizontal
mountings, efficiency, startup and shutdown
parameters, output ripple and noise, transient
response to load step-change, overload, and short
circuit.
MCD10192 Rev. 1.0, 21-Jun-10
Page 6 of 24
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