rev. date 02/2008 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. model number 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-S15-D5-SMT VAT1-S15-D9-SMT VAT1-S15-D12-SMT VAT1-S15-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 PART NUMBER: VAT1-SMT series description 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 15 Vdc 13.5~16.5 Vdc 15 Vdc 13.5~16.5 Vdc 15 Vdc 13.5~16.5 Vdc 15 Vdc 13.5~16.5 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 ±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 ±6A ±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 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% 10~15% 6.5~15% 6~15% 6~15% 6~15% efficiency 72% 75% 78% 79% 74% 76% 78% 79% 74% 75% 79% 79% 72% 74% 76% 77% 78% *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 test conditions min. 0.1 typ. for Vin change of 1% see tolerance envelope graph @ 100% load 20 MHz bandwidth 50 noise switching frequency 20 MHz bandwidth full load, nominal input 75 500 max. 1 1.2 units W % 0.03 75 %/°C mVp-p 150 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 UL60950-1 YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO NO NO rev. page 2 of 3 date 02/2008 DESCRIPTION: dc-dc converter PART NUMBER: VAT1-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) safety approved to UL60950-1 (E222736) 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. page 3 of 3 date 02/2008 DESCRIPTION: dc-dc converter PART NUMBER: VAT1-SMT series - Minimum loading APPLICATION NOTES: The converter needs a minimum of 10% loading to maintain output regulation. Operation under no-load conditions will not - Input filtering 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 Input Voltage External Input Capacitance 5V 4.7 μF 12 V 2.2 μF 15 V 2.2 μF 24 V 1.0 μF 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. An output capacitor is needed to meet output ripple requirements as shown in Table 2.Output capacitance may be - External Regulator increased for additional filtering, but should not exeed 10μF or An external 3-terminal regulator can be connected to the expanded to an LC network as in Figure 1. 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 TABLE 2 protection features in the regulator, such as OCP, OTP, etc, will protect the converter also. In a complimentory supply, a Vout External Ouput Capacitance 5V 4.7 μF 9V 2.2 μF 12 V 1.0 μF +Vin 15 V 0.47 μF -Vin 24 V 0.33 μF negative output regulator must be used to achieve the negative regulated output. +Vin L +Vin C -Vin L DC DC C L C +Vout COM -Vout -Vin REG REG +Vout DC DC DC DC COM -Vin -Vout REG REG +Vout DC DC DC DC COM REG REG <Figure 2> <Figure 1> 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 -Vout