BQ50120QTA20 SYNQOR [SynQor Worldwide Headquarters], BQ50120QTA20 Datasheet - Page 10

• Manufacturer Part Number: BQ50120QTA20
• Description: Quarter-brick DC Bus Converter
• Manufacturer: SYNQOR [SynQor Worldwide Headquarters]

Product # BQ50120QTA20
T
T
Keep Out Areas:
Component Keep Out Area: Keep out areas for components not
referenced to the Primary circuit are shown in shaded areas in
Figure F. The keep out areas shown are consistent with UL's
requirements for Basic Insulation of 0.04" (40 mils) for Pollution
degree 2. User should consult UL standards for other insulation
classes and operating environments.
Figure F: Keep Out Areas for BusQor module
(N logic)
On/Off
Figure E: Power Up/Down Diagram (not to scale) showing
Start-Up Inhibit Period.
echnical S
echnical S
UVLO
0.023”
Vout
12V
Vin
OFF
ON
t
0
t
1
2ms
1.50”
pecification
pecification
0.01”
0.01”
Phone [phone]
t
2
Primary
t
3
16.1ms
16ms
Secondary
Bridging
Capacitor
www.synqor.com
Time
t
For applications that require mounting parts BELOW the BusQor
module, one should be aware of potential high levels of electro-
magnetic interference, in addition to safety keep out. Users are
advised to consult SynQor Applications engineering in such
applications.
Copper Keep Out Area: Keep out areas shown in Figure F are
to be observed for Top layer copper traces and vias. Internal lay-
ers buried one or more layers may be exempt, depending on the
PCB material grade and thickness. Users are advised to consult
UL standards for details.
All layers including top and bottom, are subject to the keep out
areas shown around Primary pins of BusQor module. Actual
keep outs along the surface (Creepage) may vary depending on
the PCB material CTI. Users are advised to consult UL standards
for details.
Bridging Components:
capacitors required to be placed as close as possible to the
BusQor module for optimum performance must observe the clear-
ance/creepage requirements of 0.04"(40 mils) between pads to
maintain compliance to UL standards for the overall power sys-
tem.
Note: Referenced keep out widths are adequate to withstand
UL's Basic Insulation Dielectric strength tests for approved PCB
materials. Applications requiring Double or Reinforced insulation
must double the keep out widths shown in Figure F. Keep out
areas shown have standard margins above UL's minimum
requirements.
Output Load Current Calculation:
allows the converter output load to be measured without adding
a current loop or external shunt resistor to the designer’s PCB
board under test. On the top side of the BusQor converter is a
current sense resistor as shown in Figure G. The output load cur-
rent is proportional to the voltage drop across this sense resistor.
This calculation is detailed below.
A current sense resistor referenced to the primary input is used in
the equation below to calculate the output load current.
where:
I
V
V
I
load
load = output load current
Rsense(load) = voltage across the sense resistor with
Rsense(no load) = voltage across the sense resistor with
Doc.# 005-2BQ512J Rev. E
=
(
V
Rsense(load)
converter under load
converter at zero load
P
P
Current:
Bridging components like EMI filter
Current:
ackage:
ackage:
Output:
Output:
-
Input:
V
Input:
Rsense(no load)
03/17/06
42-53 V
12 V
20 A
Quarter-brick
42-53 V
12 V
20 A
Quarter-brick
The BusQor series
)
x 800
Page 10