Datasheet BD14230FVJ-C (Rohm) - 10

BD1423x-C Series Application Examples - continued
In BD1423xFJ-C (x = 5, 6, 7), the REF2 pin is internally connected to GND. The external reference voltage is input to the OFFSET pin and the output voltage is output with reference to VOFFSET/2. Figure 11. Basic Explanation 3 In BD1423xFVJ-C (x = 0, 1, 2) and BD1423xFJ-C (x = 0, 1, 2), VOUT is calculated by the below formula. 𝑉𝑂𝑈𝑇 = (𝑅𝑆𝐻𝑈𝑁𝑇 × 𝐼𝐿𝑂𝐴𝐷 × 𝐺𝐴𝐼𝑁) + 𝑉𝑅𝐸𝐹 In BD1423xFJ-C (x = 5, 6, 7), VOUT is calculated by the below formula. 𝑉 𝑉 𝑂𝐹𝐹𝑆𝐸𝑇 𝑂𝑈𝑇 = (𝑅𝑆𝐻𝑈𝑁𝑇 × 𝐼𝐿𝑂𝐴𝐷 × 𝐺𝐴𝐼𝑁) + 2 Where, 𝑅𝑆𝐻𝑈𝑁𝑇 is the Shunt resistance 𝐼𝐿𝑂𝐴𝐷 is the Load current 𝐺𝐴𝐼𝑁 is the Gain of Current Sense Amplifier 𝑉𝑅𝐸𝐹 is the intermediate voltage with REF1 pin and REF2 pin 𝑉𝑂𝐹𝐹𝑆𝐸𝑇 is the intermediate voltage with OFFSET pin Also, VOUT needs to be GND < VOUT < VDD. VOUT is clipped to Low-level Output Voltage (VOUT_L) when it’s under GND. VOUT is clipped to High-level Output Voltage (VOUT_H) when it’s over VDD. To accurately sense the current through the shunt resistor, it is necessary to use a 4-terminal Kelvin connection to avoid errors in the impedance of the current path. For stability, dispose and connect a bypass capacitor for removing power source noise close to IC. Selection of shunt resistor Shunt resistor RSHUNT should be selected considering the accuracy of measuring current and the maximum power dissipation according to an application. If the value of shunt resistor is high, it minimizes the influence of offset and increases the accuracy of measuring current. If the value of shunt resistor is low, it reduces the power dissipation of VDD. www.rohm.com
TSZ02201-0M2M0FC23020-1-2
© 2022 ROHM Co., Ltd. All rights reserved. 10/17 TSZ22111 • 15 • 001
03.Apr.2025 Rev.002
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