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BD18326NUF-M ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 17 Page - Rohm

๋ถ€ํ’ˆ๋ช… BD18326NUF-M
์ƒ์„ธ๋‚ด์šฉ  40 V 600 mA 1ch Constant Current Driver for Automotive LED Lamps
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BD18326NUF-M ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 17 Page - Rohm

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ฉ 2020 ROHM Co., Ltd. All rights reserved.
BD18326NUF-M
28.Sep.2020 Rev.001
www.rohm.com
TSZ22111 ? 15 ? 001
TSZ02201-0T1T0B300340-1-2
Description of Blocks ? continued
(Unless otherwise specified, Tj = 25 ฐC, VIN = 13 V)
13. Current Bypass Function at Reduced-Voltage
The BD18326NUF-M is built-in current bypass function at reduced-voltage.
When the VIN_DIV which is the resistor divider of the VIN pin voltage VIN is more than the BPCNT reference voltage VBP
(2.0 V (Typ)), the ISINK pin sink current IISINK decreases. The output current IOUT changes linearly.
The ISINK pin sink current IISINK can be set by the following formula.
???????????????????????? =
????????????????????
????????????????
+ ???????????????????? ื ???????????????????????? ๗ 103
[mA]
???????????????????????? =
1
????????????3
{
????????????2 ื (????????????1 ื ???????????? + ????????????3 ื ????????????)
????????????1 ื ????????????2 + ????????????3 ื (????????????1 + ????????????2)
? ????????????} ื 103 ? 0 [?A]
????????????????????????_???????????? =
????????????????????
????????????????
[mA]
Where:
????????????????????
is the ISINK current setting coefficient,
3000 (Typ).
????????????????
is the output current setting resistor,
[k?]
????????????????????
is the ISINK current gain,
-7300 (Typ).
????????????????????????
is the BPCNT pin input current,
[?A]
????????????1
is the resistor for setting current bypass 1, [k?]
????????????2
is the resistor for setting current bypass 2, [k?]
????????????3
is the resistor for setting current bypass 3, [k?]
????????????
is the BPCNT reference voltage,
2.00 V (Typ)
????????????????????????_????????????
is the ISINK pin maximum sink current,
[mA]
Current Bypass Function at Reduced-Voltage
When not using the current bypass function at reduced-voltage, the ISINK pin is connected to the GND and the
BPCNT pin is connected with pull-down resistor or to the GND.
Current
Driver
100 mA
to 600 mA
OUT
VIN
+B
ISINK
IOUT
IISINK
IOUTA
ISET
VBP
GSINK
KSINK
-
BPCNT
RBP1
RBP2
VIN_DIV
IBPCNT
RBP3
+
IOUTA
IISINK
VIN
IOUT
IBPCNT
VIN_DIV
VBP (2.00 V)
IISINK = IOUT
KSINK
RSET - GSINK x IBPCNT
IISINK_MAX


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