1/3 VEFT1-SMT Dual Output Series Dc-Dc Converter Rev. 11-2005 Description Features Designed to convert fixed voltages into an isolated voltage, the VEFT1-SMT dual series is well suited for providing board-mount local supplies in a wide range of applications, including mixed analog/digital circuits, test & measurement equip., process/machine controls, datacom/telecom fields, etc... ·Isolated 1 W output ·Temperature range: -40°C~+85°C ·Unregulated ·High efficiency to 80% ·Dual voltage output ·Small footprint ·SMD package style ·Industry standard pinout ·UL94-V0 package ·No heatsink required ·3K Vdc isolation ·Power density 0.85 W/cm³ ·No external component required ·Low cost The semi-regulated output can be followed by 3-terminal regulators to provide output protection, in addition to output regulation. Model Input Voltage Number VEFT1-S5-D5-SMT VEFT1-S5-D9-SMT VEFT1-S5-D12-SMT VEFT1-S5-D15-SMT VEFT1-S12-D5-SMT VEFT1-S12-D9-SMT VEFT1-S12-D12-SMT VEFT1-S12-D15-SMT VEFT1-S15-D5-SMT VEFT1-S15-D9-SMT VEFT1-S15-D12-SMT VEFT1-S15-D15-SMT VEFT1-S24-D5-SMT VEFT1-S24-D9-SMT VEFT1-S24-D12-SMT VEFT1-S24-D15-SMT Output Output Current Nominal Range Voltage Max. 5 Vdc 5 Vdc 5 Vdc 5 Vdc 12 Vdc 12 Vdc 12 Vdc 12 Vdc 15 Vdc 15 Vdc 15 Vdc 15 Vdc 24 Vdc 24 Vdc 24 Vdc 24 Vdc 4.5~5.5 Vdc 4.5~5.5 Vdc 4.5~5.5 Vdc 4.5~5.5 Vdc 10.8~13.2 Vdc 10.8~13.2 Vdc 10.8~13.2 Vdc 10.8~13.2 Vdc 13.5~16.5 Vdc 13.5~16.5 Vdc 13.5~16.5 Vdc 13.5~16.5 Vdc 21.6~26.4 Vdc 21.6~26.4 Vdc 21.6~26.4 Vdc 21.6~26.4 Vdc ±5 Vdc ±9 Vdc ±12 Vdc ±15 Vdc ±5 Vdc ±9 Vdc ±12 Vdc ±15 Vdc ±5 Vdc ±9 Vdc ±12 Vdc ±15 Vdc ±5 Vdc ±9 Vdc ±12 Vdc ±15 Vdc ±100 mA ±56 mA ±42 mA ±33 mA ±100 mA ±56 mA ±42 mA ±33 mA ±100 mA ±56 mA ±42 mA ±33 mA ±100 mA ±56 mA ±42 mA ±33 mA Package Min. Efficiency Style UL60950-1 ±10 mA ±6 mA ±5 mA ±4 mA ±10 mA ±6 mA ±5 mA ±4 mA ±10 mA ±6 mA ±5 mA ±4 mA ±10 mA ±6 mA ±5 mA ±4 mA 72% 75% 78% 79% 74% 76% 78% 79% 74% 75% 79% 79% 79% 80% 80% 80% SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO NO Note: 1. All specifications measured at TA=25°C, humidity <75%, nominal input voltage and rated output load unless otherwise specified. Output Specifications Item Test conditions Min. Typ. Max. Units 10 1 1.2 15 W % % 0.03 %/°C Output power Line Regulation Load Regulation Output voltage accuracy 0.1 For Vin change of 1% 10% to 100% full load See tolerance envelope graph Temperature drift @ 100% load Output ripple 20 MHz Bandwidth 50 Switching frequency Full load, nominal input 100 V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062 www.v-infinity.com 75 mVp-p KHz 1-866-372-1258 2/3 VEFT1-SMT Dual Output Series Dc-Dc Converter Rev. 11-2005 General Specifications Short circuit protection <1 second Temperature rise at full load 25°C Max, 15°C Typ. Cooling Free air convection Operating temperature range -40°C to +85°C Storage temperature range -55°C to +125°C Soldering temperature 300°C (1.5mm from case for 10 sec.) Storage humidity range <95% Case material Plastic (UL94-V0) Safety approved to UL60950-1 (E222736) MTBF >3,500,000 hrs. Burn-in Full load at +85°C, for 4 hours at no-load and 4 hours at full load. Isolation Specifications Item Isolation Voltage Insulation Resistance Test Conditions Tested for 1 min. Test at 500 Vdc Min. 3000 1000 Typ. 6.7 0 A Max. Units Vdc M Ω Typical Characteristics Outline Dimensions & Recommended Layout Pattern Side View 15.24 6.0 0.50 A 1.85MA X 7.0 1.50 1.20 0.3 5.00 Top View 15.24 7.62 11.2 7.5 MAX Pin 1 2 3 5 6 1 2 11 1 0 -Vin +Vin NC COM -Vout 1 2 3 8 7 5 6 Pin 7 8 10 11 12 NC +Vout NC NC NC Note: All Pins on a 2.54mm pitch; all pin diameters are 0.50mm; all dimensions in mm. V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062 www.v-infinity.com 1-866-372-1258 3/3 VEFT1-SMT Dual Output Series Dc-Dc Converter Rev. 11-2005 - Minimum loading Application Notes: The converter needs a minimum of 10% loading to maintain output regulation. Operation under no-load - Input filtering To reduce the reflected ripple current and minimize conditions will not cause immediate damages but EMI, especially when the converter input is more may reduce reliability, and cause performance not to than 2” away from the DC source, it is recommended meet specifications. to connect a low ESR electrolytic capacitor between Vin and Gnd. The values suggested are as shown in - Regulation Table 1. If additional filtering is required, the With a semi-regulated design, the converter’s output capacitance may be increased, or expanded to an LC voltage varies with load current and will change network as shown in Figure 1. proportionally to the input voltage. If regulated output is needed, an external regulator can be used Table 1 as shown in Figure 2. Input Voltage External Input Capacitance 5V 4.7 µF 12 V 2.2 µF 15 V 2.2 µF An input clamping device can be used for input 24 V 1.0 µF voltage limiting. An input fuse or an output fuse - Protection The converter has minimal protection against input over-voltage or output over-load, and may be permanently damaged if exposed to these conditions. can also be used to protect against over-loading. - Output filtering - Dual outputs used as a single output An output capacitor is needed to meet output ripple The +Vout and -Vout can be used to obtain a single requirements as shown in Table 2. output that is the sum of the two outputs. In this Output capacitance may be increased for additional case, the COM pin shouldn’t be used. filtering, but should not exeed 10µF or expanded to an LC network as in Figure 1. - External Regulator An external 3-terminal regulator can be connected Table 2 to the output of the converter to achieve full regulation. Make sure the converter’s output voltage Vout External Ouput Capacitance 5V 10 µF additional benefit is that the built-in protection 9V 4.7 µF features in the regulator, such as OCP, OTP, etc, will 12 V 2.2 µF supply, a negative output regulator must be used to 15 V 1 µF 24 V 0.47 µF provides sufficient head room for the regulator. An protect the converter also. In a complimentory achieve the negative regulated output. +Vin +Vout REG REG DC DC DC DC COM -Vin C -Vin L L +Vin DC DC C L -Vout +Vout C COM -Vout +Vin -Vin REG REG DC DC DC DC <Figure 1> V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062 www.v-infinity.com +Vout COM REG REG -Vout 1-866-372-1258