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rev. page date 1 of 4
04/2008
PART NUMBER: VBT1-SMT series
DESCRIPTION: dc-dc converter
description
Designed to convert fixed voltages into an isolated voltage, the VBT1-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 1
W output *temperature range: -40C~+85C *unregulated *high efficiency to 80% *single voltage output *small footprint *SMD package style *industry standard pinout *UL94-V0 package *no heatsink required *1K Vdc isolation *power density 0.85 W/cm *no external component required *low cost
model number VBT1-S3.3-S3.3-SMT VBT1-S3.3-S5-SMT VBT1-S5-S3.3-SMT VBT1-S5-S5-SMT VBT1-S5-S9-SMT VBT1-S5-S12-SMT VBT1-S5-S15-SMT VBT1-S5-S24-SMT VBT1-S12-S3.3-SMT VBT1-S12-S5-SMT VBT1-S12-S9-SMT VBT1-S12-S12-SMT VBT1-S12-S15-SMT VBT1-S12-S24-SMT VBT1-S15-S3.3-SMT VBT1-S15-S5-SMT VBT1-S15-S9-SMT VBT1-S15-S12-SMT VBT1-S15-S15-SMT VBT1-S15-S24-SMT VBT1-S24-S3.3-SMT VBT1-S24-S5-SMT VBT1-S24-S9-SMT VBT1-S24-S12-SMT VBT1-S24-S15-SMT VBT1-S24-S24-SMT
input voltage nominal 3.3 Vdc 3.3 Vdc 5 Vdc 5 Vdc 5 Vdc 5 Vdc 5 Vdc 5 Vdc 12 Vdc 12 Vdc 12 Vdc 12 Vdc 12 Vdc 12 Vdc 15 Vdc 15 Vdc 15 Vdc 15 Vdc 15 Vdc 15 Vdc 24 Vdc 24 Vdc 24 Vdc 24 Vdc 24 Vdc 24Vdc range 2.97~3.63 Vdc 2.97~3.63 Vdc 4.5~5.5 Vdc 4.5~5.5 Vdc 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 10.8~13.2 Vdc 10.8~13.2 Vdc 13.5~16.5 Vdc 13.5~16.5 Vdc 13.5~16.5 Vdc 13.5~16.5 Vdc 13.5~16.5 Vdc 13.5~16.5 Vdc 21.6~26.4 Vdc 21.6~26.4 Vdc 21.6~26.4 Vdc 21.6~26.4 Vdc 21.6~26.4 Vdc 21.6~26.4 Vdc
output voltage 3.3 Vdc 5 Vdc 3.3 Vdc 5 Vdc 9 Vdc 12 Vdc 15 Vdc 24 Vdc 3.3 Vdc 5 Vdc 9 Vdc 12 Vdc 15 Vdc 24 Vdc 3.3 Vdc 5 Vdc 9 Vdc 12 Vdc 15 Vdc 24 Vdc 3.3 Vdc 5 Vdc 9 Vdc 12 Vdc 15 Vdc 24 Vdc
output current max. 304 mA 200 mA 300 mA 200 mA 111 mA 84 mA 67 mA 42 mA 300 mA 200 mA 111 mA 84 mA 67 mA 42 mA 300 mA 200 mA 111 mA 83 mA 67 mA 42 mA 300 mA 200 mA 111 mA 83 mA 67 mA 42 mA min. 30 mA 20 mA 30 mA 20 mA 12 mA 9 mA 7 mA 5 mA 30 mA 20 mA 12 mA 9 mA 7 mA 5 mA 30mA 20 mA 12 mA 9 mA 7 mA 5 mA 30 mA 20 mA 12 mA 8 mA 7 mA 5 mA efficiency 73% 75% 70% 70% 76% 79% 78% 78% 75% 69% 73% 73% 74% 79% 73% 74% 75% 79% 79% 79% 73% 72% 76% 83% 80% 80%
package style SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD UL60950-1 NO NO NO YES YES YES YES NO NO YES YES YES YES NO NO NO NO NO NO NO NO YES YES YES YES NO
*VB(X)T1-Series with ALT PIN config. (see dimensions, page 3)
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
rev. page date 2 of 4
04/2008
PART NUMBER: VBT1-SMT series
DESCRIPTION: dc-dc converter
OUTPUT SPECIFICATIONS
item output power line regulation load regulation output voltage accuracy temperature drift output ripple output noise switching frequency test conditions for Vin change of 1% 10% to 100% full load see tolerance envelope graph @ 100% load 20 MHz bandwidth 20 MHz bandwidth full load, nominal input min. 0.1 typ. max. 1 1.2 15 0.03 75 150 units W % % %/C mVp-p mVp-p KHz
10
50 75 100
GENERAL SPECIFICATIONS
short circuit protection <1 second temperature rise at full load 25C Max, 15C typ. cooling free air convection operating temperature range -40C to +85C storage temperature range -55C to +125C soldering temperature 260C (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 +85C, for 4 hours at no-load and 4 hours at full load.
ISOLATION SPECIFICATIONS
item isolation voltage insulation resistance NOTE: test conditions tested for 1 min. test at 500 Vdc min. 1000 1000 typ. max units Vdc M
1. All specifications measured at TA=25C, humidity <75%, nominal input voltage and rated output load unless otherwise specified.
REFLOW SOLDERING PROFILE
250
Te mp eratur e ( o C)
26 0 o C
1 0 S ec M ax
200 150 100 50
0
2 2 0o C
90 Sec Max ( >220 oC )
Time ( s ec .)
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
rev. page date 3 of 4
04/2008
PART NUMBER: VBT1-SMT series
DESCRIPTION: dc-dc converter
DIMENSIONS (mm)
TYPICAL CHARACTERISTICS
20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
rev. page date 4 of 4
04/2008
PART NUMBER: VBT1-SMT 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 3.3, 5 V 12 V 15 V 24 V External Input Capacitance 4.7 F 2.2 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 3.3, 5 V 9V 12 V 15 V 24 V External Ouput Capacitance 4.7 F 2.2 F 1.0 F 0.47 F 0.33 F
+Vin -Vin
REG
+Vout
DC DC
-Vout
REG
+Vin
L C L
+Vout
+Vin -Vin
+Vout
C
-Vin
DC DC
-Vout
DC DC

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

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