BD9285F ROHM [Rohm], BD9285F Datasheet - Page 12

• Manufacturer Part Number: BD9285F
• Description: Boost 1channel white LED driver For large LCDs
• Manufacturer: ROHM [Rohm]

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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
BD9285F
○ ○ ○ ○ Pin17: CS
○ ○ ○ ○ Pin18: TC54
is hold to the external capacitance.
(For more detail on the compensation setting is described in the section " 3.6 loop compensation".)
The CS pin has two functions.
1. DC / DC current mode Feedback terminal
The inductor current is converted to the CS pin voltage by the sense resistor R
and this CS pin voltage controls the output voltage by compared with the error
amp output.
2. Inductor current limit (OCP) termina
The CS terminal also has a over current protection (OCP), if it voltage is more
than 0.5V, the switching operation will be stopped compulsorily.
high, because the leading Edge Blanking function is included into this IC to
prevent the affect noise. Please refer to the section 3.5.1 “DCDC parts selection /
how to set OCP”, for detail explanation.
This is the 5.4V (TYP.) output pin that is used for internal power supply
Available current is 100uA
TC54 can be used as a timer for the discharge of output capacitance DCDC. For detailed instructions, please refer the
section 3.4.2 “how to shutdown and set TC54 capacitance”
Both of above functions are enable after 300ns (typ.) when GATE pin asserts
l
12/36
.
CS
VIN
TSZ02201-0F1F0C100030-1-2
9285
Figure 15. CS pin circuit
GATE
GND
CS
11.Jul.2012 Rev.001
Datasheet
Rcs