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rev. page date 1 of 3
08/2007
PART NUMBER: VASD2-SIP series
DESCRIPTION: DC/DC converter
description
Designed to convert fixed voltages into an isolated voltage, the VASD2-SIP 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.
features *isolated 2
W output *temperature range: -40C~+85C *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/cm *no external component required *low cost
model number VASD2-S5-D5-SIP VASD2-S5-D9-SIP VASD2-S5-D12-SIP VASD2-S5-D15-SIP VASD2-S12-D5-SIP VASD2-S12-D9-SIP VASD2-S12-D12-SIP VASD2-S12-D15-SIP VASD2-S24-D5-SIP VASD2-S24-D9-SIP VASD2-S24-D12-SIP VASD2-S24-D15-SIP
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
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. min. 200 mA 20 mA 111 mA 12 mA 83 mA 9 mA 67 mA 7 mA 200 mA 20 mA 111 mA 12 mA 83 mA 9 mA 67 mA 7 mA 200 mA 20 mA 111 mA 12 mA 83 mA 59 mA 67 mA 7 mA
efficiency 82% 83% 85% 85% 83% 84% 86% 86% 84% 85% 87% 87%
package style SIP SIP SIP SIP SIP SIP SIP SIP SIP SIP SIP SIP
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. max. 2 1.2 15 0.03 150 units W % % %/C mVp-p KHz
10
100 75
NOTE: 1. All specifications measured at TA=25C, 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
rev. page date 2 of 3
08/2007
PART NUMBER: VASD2-SIP series
DESCRIPTION: DC/DC converter
GENERAL SPECIFICATIONS
short circuit protection temperature rise at full load cooling operating temperature range storage temperature range soldering temperature storage humidity range case material safety MTBF burn-in <1 second 25C Max, 15C typ. free air convection -40C to +85C -55C to +125C 300C (1.5mm from case for 10 sec.) <95% plastic (UL94-V0) approved to UL60950-1 (E222736) >3,500,000 hrs. full load at +85C, 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 typ. max. Vdc M units
DIMENSIONS (mm)
Side View
TYPICAL CHARACTERISTICS
Pin Function
1 2 4 5 Vi n GN D -Vo 0V +Vo
6
Bottom View
12 456
Ambient Temperature ( C )
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 date 3 of 3
08/2007
PART NUMBER: VASD2-SIP series
DESCRIPTION: DC/DC converter
APPLICATION NOTES:
- Input filtering To reduce the reflected ripple current and minimize EMI, especially when the converter input is more than 2" away from the DC source, it is recommended to connect a low ESR electrolytic capacitor between Vin and Gnd. The values suggested are as shown in Table 1. If additional filtering is required, the capacitance may be increased, or expanded to an LC network as shown in Figure 1.
- Minimum loading The converter needs a minimum of 10% loading to maintain output regulation. Operation under no-load conditions will not cause immediate damages but may reduce reliability, and cause performance not to meet specifications. - Regulation With a semi-regulated design, the converter's output voltage 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.
TABLE 1
Input Voltage 5V 12 V 24 V External Input Capacitance 4.7 F 2.2 F 1.0 F
- 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 An output capacitor is needed to meet output ripple requirements as shown in Table 2.Output capacitance may be increased for additional filtering, but should not exeed 10F or expanded to an LC network as in Figure 1.
shouldn't be used. - 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 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.
TABLE 2
Vout 5V 9V 12 V 15 V External Ouput Capacitance 4.7 F 2.2 F 1.0 F 0.47 F
+Vin -Vin
REG REG
+Vout
DC DC DC DC
REG REG
COM -Vout
+Vin
+Vout COM
+Vin
C
L
L
DC DC DC DC
+Vout
C
-Vin REG REG
-Vout
-Vin
DC DC

COM -Vout
L
C
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382

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