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YNM05S05 DC-DC Converter Data Sheet
3.0-5.5 VDC Input; 0.7525-3.63 VDC Programmable @ 5 A
Output Voltage Programming (Pin 3)
The output voltage can be programmed from
0.7525 V to 3.63 V by connecting an external resistor
between TRIM pin (Pin 3) and GND pin (Pin 4); see
Fig. D. Note that when a trim resistor is not
connected, the output voltage of the converter is
The output voltage can also be programmed by an
external voltage source. To make trimming less
sensitive, a series external resistor Rext is
recommended between the TRIM pin and the
programming voltage source. Control Voltage can be
calculated by the formula:
0.7525 V.
Vin
Y-Series
Converter
Vout
V CTRL ? 0 . 7 ?
(5.1 1 ? R EXT )(V O -REQ - 0.7525)
30.1
[V]
Vin
ON/OFF
GND
(Top View)
TRIM
R TRIM
Rload
where,
V CTRL ? Control voltage [V]
R EXT ? External resistor between TRIM pin and
voltage source; the value can be chosen depending
on the required output voltage range [k ? ]
Fig. D: Configuration for programming output voltage.
A trim resistor, R TRIM , for a desired output voltage
can be calculated using the following equation:
Control voltages with R EXT ? 0 and R EXT ? 15K are
shown in Table 2.
R T RIM ?
21.07
(V O - REQ - 0.7525)
? 5.11
[k ? ]
Table 2: Control Voltage [VDC]
V 0-REG [V] V CTRL (R EXT = 0) V CTRL (R EXT = 15K)
0.7525 0.700 0.700
where,
R TRIM ? Required value of trim resistor [k ? ]
V O ? REQ ? Desired (trimmed) output voltage [V]
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
1.0
1.2
1.5
1.8
2.0
2.5
3.3
3.63
0.658
0.624
0.573
0.522
0.488
0.403
0.268
0.212
0.535
0.401
0.201
0.000
-0.133
-0.468
-1.002
-1.223
recommended rather than one standard value from
V 0-REG [V] R TRIM [k ? ]
Table 1.
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 ? ]
0.7525 open
1.0 80.02 80.6
1.2 41.97 42.2
1.5 23.08 23.2
1.8 15.00 15
2.0 11.78 11.8
2.5 6.95 6.98
3.3 3.16 3.16
3.63 2.21 2.21
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 2.3 V for the
converter to turn on. Once the converter has been
turned on, it will shut off when the input voltage
drops below typically 2.2 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
over-load or short circuit condition is removed, Vout
will return to nominal value.
MCD10190 Rev. 1.0, 21-Jun-10
Page 6 of 25
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