rev. description date 08/2007 features · isolated 2 W output ·temperature range: -40°C~+85°C ·unregulated ·high efficiency to 87% ·dual voltage output ·small footprint ·DIP package style ·industry standard pinout ·UL94-V0 package ·no heatsink required ·1K Vdc isolation ·power density 1.42 W/cm³ ·no external component required ·low cost Designed to convert fixed voltages into an isolated voltage, the VASD2-DIP 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 1 of 3 DESCRIPTION: DC/DC converter PART NUMBER: VASD2-DIP series input voltage number VASD2-S5-D5-DIP VASD2-S5-D9-DIP VASD2-S5-D12-DIP VASD2-S5-D15-DIP VASD2-S12-D5-DIP VASD2-S12-D9-DIP VASD2-S12-D12-DIP VASD2-S12-D15-DIP VASD2-S24-D5-DIP VASD2-S24-D9-DIP VASD2-S24-D12-DIP VASD2-S24-D15-DIP page nominal 5 Vdc 5 Vdc 5 Vdc 5 Vdc 12 Vdc 12 Vdc 12 Vdc 12 Vdc 24 Vdc 24 Vdc 24 Vdc 24 Vdc range 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 21.6~26.4 Vdc 21.6~26.4 Vdc 21.6~26.4 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 output current max. ±200 mA ±111 mA ±83 mA ±67 mA ±200 mA ±111 mA ±83 mA ±67 mA ±200 mA ±111 mA ±83 mA ±67 mA package min. ±20 mA ±12 mA ±5 mA ±7 mA ±20 mA ±12 mA ±9 mA ±7 mA ±20 mA ±12 mA ±9 mA ±7 mA efficiency 82% 83% 85% 85% 83% 84% 86% 86% 84% 85% 87% 87% 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 see tolerance envelope graph @ 100% load 20 MHz Bandwidth full load, nominal input min. 0.2 typ. 10 100 75 max. 2 1.2 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 style DIP DIP DIP DIP DIP DIP DIP DIP DIP DIP DIP DIP rev. page 2 of 3 date 08/2007 DESCRIPTION: DC/DC converter PART NUMBER: VASD2-DIP 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 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. 1000 1000 DIMENSIONS (mm) Side View typ. max. units Vdc M Ω TYPICAL CHARACTERISTICS Pin Fu nctio n 1 7 8 9 11 14 -Vin NC COM +Vout -Vout +Vin Bottom View Ambient Temperature ( C ) 1 14 11 7 14 9 8 1 11 9 8 7 Note: All Pins on a 2.54mm pitch; all pin diameters are 0.50mm; all dimensions in mm. 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 rev. page 3 of 3 date 08/2007 DESCRIPTION: DC/DC converter PART NUMBER: VASD2-DIP 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 The converter has minimal protection against input over- Input Voltage External Input Capacitance 5V 4.7 µF 12 V 2.2 µF 24 V 1.0 µF voltage 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 0.47 µF -Vin 15 V negative output regulator must be used to achieve the negative regulated output. +Vout REG REG DC DC DC DC COM -Vout +Vin REG REG +Vout REG REG -Vout DC DC DC DC +Vin C -Vin L L DC DC +Vout C L C -Vin COM -Vout <Figure 1> 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 COM