BR205 查看數據表（PDF） - Sanken Electric co.,ltd.
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BR205 Datasheet PDF : 12 Pages
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BR205
POL Converter Module for 5 V System Intermediate Bus
Functional Description
Power Good ( PG) Operation
When output voltage, VOUT , is within the Power Good detection
VPG(5V)
BR205
range, the PG pin is disconnected internally by the MOSFET
PG
switch. The signal at the Power Good node is pulled up to 5 V. If
Power Good
VOUT falls out of the Power Good detection range, the MOSFET
switch connects PG to GND, and the signal at the Power Good
GND
node is pulled low. The PG peripheral circuit is shown in figure 3.
GND
Figure 3. PG peripheral circuit
Output Sensing ( VS+) and Compensation
Reduction in output voltage can be compensated by connecting
the output sense terminal, VS+ , to the load. When using LC filter,
the proper connection is shown in panel A of figure 4. Note: Do
not connect the output sense terminal to the output of the LC
filter. It may not operate normally.
(A)
CAUTION: When the output sense terminal is not used, it must
be connected directly to the VOUT output terminal. This is shown
in panel B of figure 4.
BR205
VOUT
VS+
GND
COUT
L
COL
Load
External On/Off Output Control (ON/¯O¯¯F¯¯F¯)
Operation of the output of the product can be turned on and off by
using the On/Off function, irrespective of input voltage connec-
tion.
(B)
This is enabled by connection of the ON/¯O¯¯F¯F pin (pin 1) (refer
to panel A of figure 5):
BR205
VOUT
VS+
GND
COUT
Load
• When the ON/¯O¯¯F¯F pin is open, the output voltage is on
• When the ON/¯O¯¯F¯F pin is connected to GND, the output voltage
is off
The ON/¯O¯¯F¯F pin is also used as a soft-start function. Do not con-
nect the ON/¯O¯¯F¯F pin to the other pins in parallel, and be sure to
connect the ON/¯O¯¯F¯F pin to a single switch device such as a FET
(see figure 5). Do not pull-up the ON/¯O¯¯F¯F pin from the external
voltage source.
Figure 4. VS+ peripheral circuit
BR205
ON/OFF
GND
CAUTION:
• The ON/¯O¯¯F¯F pin is pulled-up inside the BR205 converter.
Therefore, a voltage of 5.0 V is output to the ON/¯O¯¯F¯F pin.
• Do not feed voltage to the ON/¯O¯¯F¯F pin from outside BR205
converter.
Figure 5. ON/¯O¯¯F¯¯F¯ peripheral circuit
BR205-DS, Rev. 0.05E
6
SANKEN ELECTRIC CO., LTD.
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