rev. date 02/2008 features · isolated 2 Designed to convert fixed voltages into an isolated voltage, the VAT2-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. model number VAT2-S5-D5-SMT VAT2-S5-D9-SMT VAT2-S5-D12-SMT VAT2-S5-D15-SMT VAT2-S12-D5-SMT VAT2-S12-D9-SMT VAT2-S12-D12-SMT VAT2-S12-D15-SMT 1 of 3 DESCRIPTION: dc-dc converter PART NUMBER: VAT2-SMT series description page W output ·temperature range: -40°C~+85°C ·unregulated ·high efficiency to 85% ·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 output voltage ±5 Vdc ±9 Vdc ±12 Vdc ±15 Vdc ±5 Vdc ±9 Vdc ±12 Vdc ±15 Vdc output current max. min. ±200 mA ±20 mA ±111 mA ±11 mA ±83 mA ±8 mA ±67 mA ±7 mA ±200 mA ±20 mA ±111 mA ±11 mA ±83 mA ±8 mA ±67 mA ±7 mA OUTPUT SPECIFICATIONS item output power line regulation load regulation output voltage accuracy temperature drift output ripple switching frequency test conditions for Vin change of 1% 10% to 100% full load (±5 output) 10% to 100% full load (±9 output) 10% to 100% full load (±12 output) 10% to 100% full load (±15 output) see tolerance envelope graph @ 100% load 20 MHz bandwidth full load, nominal input min. 0.2 typ. 12.8 8.3 6.8 6.3 75 70 max. 2 ±1.2 15 15 15 15 units W % % % % % 0.03 150 %/°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 503.612.2382 efficiency 82% 83% 84% 82% 83% 84% 84% 85% rev. page 2 of 3 date 02/2008 DESCRIPTION: dc-dc converter PART NUMBER: VAT2-SMT series 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) MTBF >3,500,000 hrs. ISOLATION SPECIFICATIONS item isolation voltage insulation resistance DIMENSIONS (mm) test conditions tested for 1 min. test at 500 Vdc min. 1000 1000 typ. max. units Vdc M Ω TYPICAL CHARACTERISTICS 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. PART NUMBER: VAT2-SMT series APPLICATION NOTES: page 3 of 3 date 02/2008 DESCRIPTION: dc-dc converter - Minimum loading The converter needs a minimum of 10% loading to maintain - Input filtering output regulation. Operation under no-load conditions will not To reduce the reflected ripple current and minimize EMI, cause immediate damages but may reduce reliability, and especially when the converter input is more than 2” away from cause performance not to meet specifications. the DC source, it is recommended to connect a low ESR electrolytic capacitor between Vin and Gnd. The values - Regulation suggested are as shown in Table 1. If additional filtering is With a semi-regulated design, the converter’s output voltage required, the capacitance may be increased, or expanded to varies with load current and will change proportionally to the an LC network as shown in Figure 1. input voltage. If regulated output is needed, an external regulator can be used as shown in Figure 2. TABLE 1 - 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 be used for input voltage limiting. An input fuse or an output fuse also be used to protect against over-loading. - 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 - Output filtering shouldn’t be used. Output capacitance may be increased for additional 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 to the output of the converter to achieve full regulation. Make sure the converter’s output voltage provides sufficient head room FIGURE 1 for the regulator. An additional benefit is that the built-in protection features in the regulator, such as OCP, OTP, etc, will protect the converter also. In a complimentory supply, a negative output regulator must be used to achieve the negative regulated output. RECOMMENDED REFLOW SOLDERING PROFILE FIGURE 2 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382