rev. description date 01/2011 features · isolated 1 Designed to convert fixed voltages into an isolated voltage, the VAT1-SMT 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... The semi-regulated output can be followed by 3-terminal regulators to provide output protection, in addition to output regulation. VAT1-S5-D5-SMT VAT1-S5-D9-SMT VAT1-S5-D12-SMT VAT1-S5-D15-SMT VAT1-S12-D5-SMT VAT1-S12-D9-SMT VAT1-S12-D12-SMT VAT1-S12-D15-SMT VAT1-S24-D5-SMT VAT1-S24-D9-SMT VAT1-S24-D12-SMT VAT1-S24-D15-SMT VAT1-S24-D24-SMT 1 of 3 DESCRIPTION: dc-dc converter SERIES: VAT1-SMT MODEL page W output ·temperature range: -40°C~+85°C ·unregulated ·high efficiency to 79% ·dual voltage output ·small footprint ·SMD package style ·industry standard pinout ·UL94-V0 package ·no heatsink required ·1K Vdc isolation ·high power density ·no external component required ·low cost input voltage nominal range 5 Vdc 4.5~5.5 Vdc 5 Vdc 4.5~5.5 Vdc 5 Vdc 4.5~5.5 Vdc 5 Vdc 4.5~5.5 Vdc 12 Vdc 10.8~13.2 Vdc 12 Vdc 10.8~13.2 Vdc 12 Vdc 10.8~13.2 Vdc 12 Vdc 10.8~13.2 Vdc 24 Vdc 21.6~26.4 Vdc 24 Vdc 21.6~26.4 Vdc 24 Vdc 21.6~26.4 Vdc 24 Vdc 21.6~26.4 Vdc 24 Vdc 21.6~26.4 Vdc output voltage ±5 Vdc ±9 Vdc ±12 Vdc ±15 Vdc ±5 Vdc ±9 Vdc ±12 Vdc ±15 Vdc ±5 Vdc ±9 Vdc ±12 Vdc ±15 Vdc ±24 Vdc output current max. min. ±100 mA ±10 mA ±56 mA ±6 mA ±42 mA ±5 mA ±33 mA ±4 mA ±100 mA ±10 mA ±56 mA ±6 mA ±42 mA ±5 mA ±33 mA ±4 mA ±100 mA ±10 mA ±56 mA ±6 mA ±42 mA ±5 mA ±33 mA ±4 mA ±21 mA ±2 mA efficiency 72% 75% 78% 79% 74% 76% 78% 79% 72% 74% 76% 77% 78% load regulation 10~15% 6.5~15% 6~15% 6~15% 10~15% 6.5~15% 6~15% 6~15% 10~15% 6.5~15% 6~15% 6~15% 6~15% UL60950-1 YES YES YES YES YES YES YES YES NO NO NO NO NO *VA(X)T1-Series with ALT PIN config. (see dimensions, page 2) OUTPUT SPECIFICATIONS item output power line regulation output voltage accuracy temperature drift output ripple noise switching frequency test conditions for Vin change of 1% see tolerance envelope graph @ 100% load 20 MHz bandwidth 20 MHz bandwidth full load, nominal input min. 0.1 100 typ. 50 75 125 max. 1 1.2 units W % 0.03 75 150 160 %/°C mVp-p KHz note: 1. All specifications measured at TA=25°C, humidity <75%, nominal input voltage and rated output load unless otherwise specified. 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2383 www.v-infinity.com rev. page 2 of 3 date 01/2011 DESCRIPTION: dc-dc converter SERIES: VAT1-SMT GENERAL SPECIFICATIONS short circuit protection temperature rise at full load <1 second 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 260°C (1.5mm from case for 10 sec.) storage humidity range <95% case material plastic (UL94-V0) safety 2 approved to UL60950-1 (E222736) MTBF >3,500,000 hrs. note: 2. See table on page 1 for available models ISOLATION SPECIFICATIONS item isolation voltage insulation resistance test conditions tested for 1 min. test at 500 Vdc min. 1000 1000 DIMENSIONS (mm) typ. max. units Vdc M Ω TYPICAL CHARACTERISTICS COM COM 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2383 www.v-infinity.com rev. page 3 of 3 date 01/2011 DESCRIPTION: dc-dc converter SERIES: VAT1-SMT - Minimum loading APPLICATION NOTES: To ensure this module can operate efficiently and reliably, a minimum load is specified for this kind of DC/DC converter in - Input filtering To reduce the reflected ripple current and minimize EMI, addition to a maximum load (namely full load). During especially when the converter input is more than 2” away from operation, make sure the specified range of input voltage is the DC source, it is recommended to connect a low ESR not exceeded, the minimum output load is not less than 10% electrolytic capacitor between Vin and Gnd. The values of the full load, and that this product should never be operated suggested are as shown in Table 1. If additional filtering is under no load! If the actual output power is very small, please required, the capacitance may be increased, or expanded to connect a resistor with proper resistance at the output end in an LC network as shown in Figure 1. parallel to increase the load, or use our company’s products with a lower rated output powera TABLE 1 - Regulation With a semi-regulated design, the converter’s output voltage Input Voltage External Input Capacitance 5V 4.7 μF 12 V 2.2 μF 24 V 1.0 μF varies with load current and will change proportionally to the input voltage. If regulated output is needed, an external regulator can be used as shown in Figure 2. - Protection The converter has minimal protection against input overvoltage or output over-load, and may be permanently damaged if exposed to these conditions. An input clamping device can - Output filtering be used for input voltage limiting. An input fuse or an output An output capacitor is needed to meet output ripple fuse also be used to protect against over-loading. requirements as shown in Table 2.Output capacitance may be increased for additional filtering, but should not exeed 10μF or expanded to an LC network as in Figure 1. - Dual outputs used as a single output The +Vout and -Vout can be used to obtain a single output that is the sum of the two outputs. In this case, the COM pin shouldn’t be used. TABLE 2 - External Regulator Vout External Ouput Capacitance 5V 4.7 μF 9V 2.2 μF 12 V 1.0 μF protection features in the regulator, such as OCP, OTP, etc, 15 V 0.47 μF will protect the converter also. In a complimentory supply, a 24 V 0.33 μF +Vin C output of the converter to achieve full regulation. Make sure the converter’s output voltage provides sufficient head room for the regulator. An additional benefit is that the built-in negative output regulator must be used to achieve the negative regulated output. L L DC DC -Vin <Figure 1> +Vout C L An external 3-terminal regulator can be connected to the C COM -Vout +Vin -Vin +Vin +Vout REG REG DC DC DC DC COM -Vin -Vout REG REG +Vout DC DC DC DC COM -Vin REG REG -Vout <Figure 2> 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2383 www.v-infinity.com