YS05S16 DC-DC Converter Data Sheet - Power-One

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YS05S16 DC-DC Converter Data Sheet3.0-5.5 VDC Input; 0.7525-3.63 VDC Programmable @ 16 AThe ON/OFF pin is internally pulled up to Vin forpositive logic version, and pulled down for a negativelogic version. A TTL or CMOS logic gate, opencollector(open-drain) transistor can be used to driveON/OFF pin. This device must be capable of:– sinking up to 1.2 mA at a low level voltage of 0.8 V– sourcing up to 0.25 mA at a high logic level of2.3 V - 5.5 V.When using open-collector (open-drain) transistorwith a negative logic option, add a pull-up resistor(R*) to Vin as shown in Fig. C:– 20 K, if the minimum Vin is 4.5 V– 10 K, if the minimum Vin is 3.0 V– 5 K, if the undervoltage shutdown at 2.05 - 2.15 Vis required.Remote Sense (Pin 2)The remote sense feature of the convertercompensates for voltage drops occurring onlybetween Vout pin (Pin 4) of the converter and theload. The SENSE (Pin 2) pin should be connected atthe load or at the point where regulation is required(see Fig. D). There is no sense feature on the outputGND return pin, where the solid ground plane shouldprovide a low voltage drop.equal to the product of the nominal output voltageand the allowable output current for the givenconditions.When using remote sense, the output voltage at theconverter can be increased up to 0.5 V above thenominal rating in order to maintain the requiredvoltage across the load. Therefore, the designermust, if necessary, decrease the maximum current(originally obtained from the derating curves) by thesame percentage to ensure the converter’s actualoutput power remains at or below the maximumallowable output power.Output Voltage Programming (Pin 3)The output voltage can be programmed from0.7525 V to 3.63 V by connecting an external resistorbetween TRIM pin (Pin 3) and GND pin (Pin 5); seeFig. E. Note that when a trim resistor is notconnected, the output voltage of the converter is0.7525 V.VinVinON/OFFGNDY-SeriesConverter(Top View)SENSEVoutTRIMRloadRTRIMVinVinON/OFFGNDY-SeriesConverter(Top View)SENSEVoutTRIMFig. D: Remote sense circuit configuration.RwRwRloadIf remote sensing is not required, the SENSE pinmust be connected to the Vout pin (Pin 4) to ensurethe converter will regulate at the specified outputvoltage. If these connections are not made, theconverter will deliver an output voltage that is slightlyhigher than the specified value.Because the sense lead carries minimal current,large trace on the end-user board are not required.However, sense trace should be located close to aground plane to minimize system noise and ensureoptimum performance.When utilizing the remote sense feature, care mustbe taken not to exceed the maximum allowableoutput power capability of the converter, which isFig. E: Configuration for programming output voltage.A trim resistor, R TRIM , for a desired output voltagecan be calculated using the following equation:21.07RTRIM 5.11[kΩ](VO-REQ- 0.7525)where,RTRIM Required value of trim resistor [kΩ]VOREQ Desired (trimmed) output voltage [V]Note that the tolerance of a trim resistor directlyaffects the output voltage tolerance. It isrecommended to use standard 1% or 0.5% resistors;for tighter tolerance, two resistors in parallel arerecommended rather than one standard value fromTable 1.Ground pin of the trim resistor should be connecteddirectly to the converter GND pin (Pin 5) with novoltage drop in between. Table 1 provides the trimresistor values for popular output voltages.MCD10205 Rev. 1.0, 24-Jun-10 Page 6 of 25 www.power-one.com
YS05S16 DC-DC Converter Data Sheet3.0-5.5 VDC Input; 0.7525-3.63 VDC Programmable @ 16 ATable 1: Trim Resistor ValueV 0-REG [V] R TRIM [kΩ]The ClosestStandard Value [kΩ]0.7525 open1.0 80.0 80.61.2 41.97 42.21.5 23.1 23.21.8 15 152.0 11.78 11.82.5 6.95 6.983.3 3.16 3.163.63 2.21 2.21The output voltage can also be programmed byexternal voltage source. To make trimming lesssensitive, a series external resistor Rext isrecommended between TRIM pin and programmingvoltage source. Control Voltage can be calculated bythe formula:(5.11REXT)(VO-REQ- 0.7525)VCTRL 0.7 [V]30.1where,VCTRL Control voltage [V]REXT External resistor between TRIM pin andvoltage source; the value can be chosen dependingon the required output voltage range [kΩ].Control voltages withshown in Table 2.REXT 0 and REXT 15K areTable 2: Control Voltage [VDC]V 0-REG [V] V CTRL (R EXT = 0) V CTRL (R EXT = 15K)0.7525 0.700 0.7001.0 0.658 0.5351.2 0.624 0.4011.5 0.573 0.2011.8 0.522 -0.0002.0 0.488 -0.1332.5 0.403 -0.4683.3 0.268 -1.0023.63 0.257 -1.044Protection FeaturesInput Undervoltage LockoutInput undervoltage lockout is standard with thisconverter. The converter will shut down when theinput voltage drops below a pre-determined voltage;it will start automatically when Vin returns to aspecified range.The input voltage must be typically 2.05 V for theconverter to turn on. Once the converter has beenturned on, it will shut off when the input voltagedrops below typically 1.9 V.Output Overcurrent Protection (OCP)The converter is protected against overcurrent andshort circuit conditions. Upon sensing an overcurrentcondition, the converter will enter hiccup mode. Onceover-load or short circuit condition is removed, Voutwill return to nominal value.Overtemperature Protection (OTP)The converter will shut down under anovertemperature condition to protect itself fromoverheating caused by operation outside the thermalderating curves, or operation in abnormal conditionssuch as system fan failure. After the converter hascooled to a safe operating temperature, it willautomatically restart.Safety RequirementsThe converter meets North American andInternational safety regulatory requirements perUL60950 and EN60950. The maximum DC voltagebetween any two pins is Vin under all operatingconditions. Therefore, the unit has ELV (extra lowvoltage) output; it meets SELV requirements underthe condition that all input voltages are ELV.The converter is not internally fused. To comply withsafety agencies’ requirements, a recognized fusewith a maximum rating of 20 Amps must be used inseries with the input line.CharacterizationGeneral InformationThe converter has been characterized for manyoperational aspects, to include thermal derating(maximum load current as a function of ambienttemperature and airflow) for vertical and horizontalmountings, efficiency, startup and shutdownparameters, output ripple and noise, transientresponse to load step-change, overload, and shortcircuit.MCD10205 Rev. 1.0, 24-Jun-10 Page 7 of 25 www.power-one.com
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YS05S16 DC-DC Converter Data Sheet - Power-One

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