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YEV09T03-0G Datasheet(PDF) 8 Page - Power-One |
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YEV09T03-0G Datasheet(HTML) 8 Page - Power-One |
8 / 10 page YEV09T03 3A DC-DC POL Converter 4.5V to 13.8V Input 0.59V to 5.1V Output Data Sheet ZD-01968 Rev 1.1, 25-Mar-09 www.power-one.com Page 8 of 10 where: VOUT = Desired (trimmed) value of output voltage V RTRIM = Required value of the trim resistor in kΩ If the RTRIM 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. Table 1. Trim Resistor Values V0UT, V Calculated RTRIM, kΩ Standard Value of 0.1% Resistor, kΩ 0.8 5.65 5.62 1.2 1.94 1.93 1.5 1.3 1.30 1.8 0.98 0.976 2.5 0.62 0.619 3.3 0.44 0.437 5.0 0.27 0.267 6.3 ON/OFF (Pin 1) 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 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 13. Circuit Configuration For ON/OFF Function 6.4 Protections 6.4.1 Input Undervoltage Lockout 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 will automatically restart and Vout will return to its nominal value. 7. Characterization 7.1 Ripple and Noise The output voltage ripple and input reflected ripple current waveforms are measured using the test setup shown in Figure 14. 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 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 requirements must be observed. These requirements are included in UL60950 - CSA60950- 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 CONTROL INPUT VIN GND ON/OFF VOUT 3 2 4 1 TRIM 5 Rload INPUT VOLTAGE 4.32kΩ RTRIM Internal Enable Circuit YEV09T03 Vout V source 22 F ceramic capacitor 1H DC/DC Converter 100 F tantalum +2x10F ceramic CIN YEV09T03 |
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