rev.
page 3 of 3
date 09/2009
PART NUMBER: VWRBS2
DESCRIPTION: dc-dc converter
- Input current
Application Notes:
Nominal input voltage range. The input
current of the power supply must be sufficient
to the startup current (Ip) of the DC/DC module
(Figure 2)
- All of the VWRBS2-SIP Series have been tested
according to the following recommended testing
circuit before leaving the factory. This series should
be tested under load(Figure ±). If you want to further
decrease the input/output ripple, you can increase
capacitance properly or choose capacitors with
low ESR. However, the capacitance should not be too
high(Table 2).
Ip
Input Voltage
Range
External Capacitor Table
Input Voltage (V)
Single
Dual
Cout(uF)
Cout(uF)
Cs(uF)
Vout(VDC)
Vout(VDC)
ꢀ.ꢀ
ꢂ
9
±2
±ꢂ
24
2200
±000
820
680
ꢂ60
-
-
-
±ꢂ
±9
±±2
±±ꢂ
-
±ꢂ60
±470
±ꢀꢀ0
±270
-
47
47
47
47
-
- Output Load
In order to ensure the product operates
efficiently and reliably, make sure the specified range
of input voltage is not exceeded.
470
Table 2
No parallel connection or plug and play.
Temperature Derating Graph
- NC Terminals
Unless otherwise specified, NC terminals of all series
are used for converter's interior circuit
connection, and are not allowed connection of any
external circuit.;
Operating Temp.( C )
-
Remote on/off control (see figure ±)
ON: When control pin (CTRL pin ꢀ) open or Ic
OFF: With a ꢀ-±0mA input current (Ic) to pin ꢀ, output will be disabled. Under no conditions
should input current (Ic) exceed 20mA. The Value of R in Figure ± can be derived as follows:
< 0.ꢂmA, converter will have normal output.
Vc - Vd - 0.6ꢂV
Ic
Vc= Voltage at control input
Vd= Diode (D±) voltage drop (.7V voltage drop typical)
Ic= Input Current (ꢂmA recommended disable current)
R=
example 1 : Logic circuit — Apply ꢂV TTL logic signal on Vc to disable output
ꢂV - 0.7V - 0.6ꢂV
Choose 720Ω resistor
R=
= 7ꢀ0 Ω
.005A
example 2 : Short Vin to Vc — Apply ±2V on Vc to disable output
±2V - 0.7V - 0.6ꢂV
R=
= 2±ꢀ0 Ω
Choose 2KΩ resistor
.00ꢂA
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2383 www.v-infinity.com
