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BD18326NUF-M Datasheet(PDF) 17 Page - Rohm |
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BD18326NUF-M Datasheet(HTML) 17 Page - Rohm |
17 / 39 page 17/36 © 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 °C, 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. ������������������������ = �������������������� ���������������� + �������������������� × ������������������������ ÷ 103 [mA] ������������������������ = 1 ������������3 { ������������2 × (������������1 × ������������ + ������������3 × ������������) ������������1 × ������������2 + ������������3 × (������������1 + ������������2) − ������������} × 103 ≥ 0 [μA] ������������������������_������������ = �������������������� ���������������� [mA] Where: �������������������� is the ISINK current setting coefficient, 3000 (Typ). ���������������� is the output current setting resistor, [kΩ] �������������������� is the ISINK current gain, -7300 (Typ). ������������������������ is the BPCNT pin input current, [μA] ������������1 is the resistor for setting current bypass 1, [kΩ] ������������2 is the resistor for setting current bypass 2, [kΩ] ������������3 is the resistor for setting current bypass 3, [kΩ] ������������ 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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