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BM1R00129-E2 Datasheet(PDF) 5 Page - Rohm

Part # BM1R00129-E2
Description  High Efficiency and Low Standby Power CCM corresponding
Download  26 Pages
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BM1R00129-E2 Datasheet(HTML) 5 Page - Rohm

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TSZ02201-0F4F0A2BM1R0-1-2
© 2016 ROHM Co., Ltd. All rights reserved.
20. Apr. 2016 Rev.002
www.rohm.com
TSZ22111
• 15 • 001
BM1R00xxxF
Description of Block
1.
SET_COMP Block
Monitors the DRAIN terminal voltage, and outputs a signal to turn ON the FET if the DRAIN terminal voltage is less
than or equal to -100mV (Typ).
2.
RESET_COMP Block
Monitors the DRAIN terminal voltage and outputs a signal to turn OFF the FET if the DRAIN terminal voltage is more
than or equal to -6mV (Typ).
3.
Compulsion ON TIME Block
When the FET is turned ON due to SET_COMP detection, noise occurs on the DRAIN terminal. To prevent the noise
from turning OFF the FET, an ON state should be forced for a certain time. Compulsion ON time is within a range of
0µs (None) to 3.5µs, which is different for each series number (refer to page.1 table).
4.
Compulsion OFF TIME Block
When the FET is turned OFF due to RESET_COMP detection, resonance waveforms appear on the DRAIN terminal.
To prevent the noise from turning ON the FET, an OFF state should be forced for a certain time. Compulsion OFF time
is within a range of 1.3µs to 4.6µs, which is different for each series number (refer to page.1 table).
Operation sequence of each block is shown on the figure below
.
About Maximum Input Frequency
The Maximum Operating Frequency of the IC depends on the Compulsion ON/OFF Time. For example, BM1R00026F and
BM1R00146F Compulsion ON and OFF Time is both equal to
0μs. Considering a variation of 9%, the maximum input
frequency is given by the following:
fMAX = 1 / ((0μs + 1.3μs) x 1.09) = 706kHz
However, since the frequency varies greatly due to the input voltage and load, it will be necessary to select the series in
accordance with each application.
0V
二次側
DRAIN
SET COMP
ON
ON
VGATE
0V
0V
RESET COMP
RESET
0V
ON
-100mV
RESET
-6mV
-6mV
VOUT
Compulsion
ON Time
0V
ON
TIME
0V
OFF
TIME
ON
TIME
OFF
TIME
-100mV
-100mV
-6mV
-6mV
Compulsion
OFF Time
ON
-100mV
Figure 1. Operation sequence


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