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VBT2-SMT Series DC-DC Converter Rev. 12-2006
Description
Designed to convert fixed voltages into an isolated voltage, the VBT2-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.
Features
*Isolated 2 W output *Temperature range: -40C~+85C *Unregulated *High efficiency to 85% *Single voltage output *Small footprint *SMT package style *Industry standard pinout *UL94-V0 package *No heatsink required *1K VDC isolation *High power density *No external component required *Low cost
Model Number VBT2-S5-S5-SMT VBT2-S5-S9-SMT VBT2-S5-S12-SMT VBT2-S5-S15-SMT VBT2-S12-S5-SMT VBT2-S12-S9-SMT VBT2-S12-S12-SMT VBT2-S12-S15-SMT
Input Voltage Nominal 5 Vdc 5 Vdc 5 Vdc 5 Vdc 12 Vdc 12 Vdc 12 Vdc 12 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
Output Voltage 5 Vdc 9 Vdc 12 Vdc 15 Vdc 5 Vdc 9 Vdc 12 Vdc 15 Vdc
Output Current Max. 400 mA 222 mA 167 mA 133 mA 400 mA 222 mA 167 mA 133 mA Min. 40 mA 23 mA 17 mA 14 mA 40 mA 23 mA 17 mA 14 mA Efficiency 81% 82% 84% 84% 82% 83% 85% 85%
Package Style SMT SMT SMT SMT SMT SMT SMT SMT
Output Specifications
Item Output power Line Regulation Load Regulation Test conditions For Vin change of 1% 10% to 100% full load (3.3V,5V output) 10% to 100% full load (9V output) 10% to 100% full load (12V output) 10% to 100% full load (15V output) See tolerance envelope graph 100% load 20 MHz Bandwidth Full load, nominal input Min. 0.2 Typ. Max. 2 1.2 15 15 15 15 0.03 200 Units W % % % % % %/C mVp-p KHz
12.8 8.3 6.8 6.3
Output voltage accuracy Temperature drift Output ripple Switching frequency
100 100
Note: 1. All specifications measured at TA=25C, humidity <75%, nominal input voltage and rated output load unless otherwise specified.
V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062
www.v-infinity.com
1-866-372-1258
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VBT2-SMT Series DC-DC Converter Rev. 12-2006 General Specifications
Short circuit protection Temperature rise at full load Cooling Operating temperature range Storage temperature range Soldering temperature Storage humidity range Case material MTBF 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) >3,500,000 hrs.
Isolation Specifications
Item Isolation Voltage Insulation Resistance Test Conditions Tested for 1 min. Test at 500 Vdc Min. 1000 1000 Typ. Max. Units Vdc M
Typical Characteristics
Ambient Temperature (
)
Outline Dimensions & Recommended Layout Pattern
2.54 14 13 12
10 9 8
18.03 12.7 RoHS 567 123 1 5.2 4 1 7.7 8
PIN
1 2 3 5 6 7 G ND Vin NA NA 0V +Vo
14 13 12 10 9 8
PIN
8 9 10 12 13 14 NA NA NA NA NA NA
123
567
Top View
2 .75 6.00 5.75 2 .54 0 .25 2 .74
A
0 .2-0 .3
Side View
Front View
Note: All Pins on a 2.54mm pitch; all pin diameters are 0.50mm; all dimensions in mm.
V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062
www.v-infinity.com
1-866-372-1258
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VBT2-SMT Series DC-DC Converter Rev. 12-2006
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. - Protection The converter has minimal protection against input over-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 can also be used to protect against over-loading.
Table 1
Input Voltage 5V 12 V 24 V
External Input Capacitance 4.7 F 2.2 F 1.0 F
- 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.
- 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. - 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.
+Vout
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 GND
REG
DC DC
0V
REG
L
Vin
L
+Vo
C
GND
DC DC

C
0V
Vin GND
+Vout
DC DC
0V
V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062
www.v-infinity.com
1-866-372-1258

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