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YEV09T03 3A DC-DC POL Converter
4.5V to 13.8V Input ? 0.59V to 5.1V Output
Data Sheet
where:
6.4
Protections
6.4.1 Input Undervoltage Lockout
V OUT = Desired (trimmed) value of output voltage V
R TRIM = Required value of the trim resistor in k ?
If the R TRIM is not used, the output voltage of the POL
converter will be 0.591V.
Note that the trim resistor tolerance directly affects
the output voltage accuracy. It is recommended to
use ±0.1% trim resistors to meet the output voltage
setpoint accuracy specified in p. 4.2.
The POL converter will shut down when the input
voltage drops below a predetermined voltage. It will
start automatically when the input voltage exceeds
the specified threshold.
6.4.2 Output Overcurrent Protection
The POL converter is protected against overcurrent
and short circuit conditions. Upon sensing an
overcurrent condition, the POL converter will enter
hiccup mode of operation. Once the overload or
short circuit condition is removed, the POL converter
V 0UT, V
Table 1. Trim Resistor Values
Calculated Standard Value of
R TRIM , k ? 0.1% Resistor, k ?
will automatically restart and Vout will return to its
nominal value.
7. Characterization
0.8
1.2
5.65
1.94
5.62
1.93
7.1
Ripple and Noise
1.5
1.8
2.5
3.3
5.0
1.3
0.98
0.62
0.44
0.27
1.30
0.976
0.619
0.437
0.267
The output voltage ripple and input reflected ripple
current waveforms are measured using the test
setup shown in Figure 14.
6.3
ON/OFF (Pin 1)
1 ? H
C IN
YEV09T03
22 ? F
The ON/OFF pin is used to turn the POL converter
ON or OFF remotely by a signal from a system
controller. For positive logic, the POL converter is
V source
100 ? F
tantalum
+ 2 x 10 ? F
ceramic
DC/DC
Converter
ceramic
capacitor
Vout
ON when the ON/OFF pin is at a logic high (2.4V
min) or left open. The POL converter is OFF when
the ON/OFF pin is at a logic low (0.4V max) or
connected to GND.
The ON/OFF pin should be controlled with an open
collector transistor as shown in Figure 13.
Figure 14. Test Setup For Measuring Input Reflected-Ripple
Current And Output Voltage Ripple
8. Safety
The YEV09T03 POL converters do not provide
isolation from input to output. The input devices
INPUT
VOLTAGE
CONTROL
INPUT
2
1
VIN
ON /OFF
YEV09T03
Internal
Enable
Circuit
4.32k ?
VOUT
TRIM
4
5
R TRIM
Rload
powering YEV09T03 must provide relevant isolation
requirements according to all IEC60950 based
standards. Nevertheless, if the system using the
converter needs to receive safety agency approval,
certain rules must be followed in the design of the
system. In particular, all of the creepage and
clearance requirements of the end-use safety
3
GND
requirements must be observed. These
requirements are included in UL60950 - CSA60950-
Figure 13. Circuit Configuration For ON/OFF Function
00 and EN60950, although specific applications may
have other or additional requirements.
The YEV09T03 POL converters have no internal
fuse. If required, the external fuse needs to be
ZD-01968 Rev 1.2, 18-Jun-10
www.power-one.com
Page 8 of 10
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