A7431
DC-DC CONVERTER BUCK (STEP-DOWN)
42V 3A CC/CV
AiT Semiconductor Inc.
www.ait-ic.com
CC Loop Stability
The constant-current control loop is internally compensated over the 1500mA-3000mA output range. No
additional external compensation is required to stabilize the CC current.
Output Cable Resistance Compensation
To compensate for resistive voltage drop across the charger's output cable, the A7431 integrates a simple,
user-programmable cable voltage drop compensation using the impedance at the FB pin. Use the curve in
Figure 6 to choose the proper feedback resistance values for cable compensation. RFB1 is the high side
resistor of voltage divider.
In the case of high RFB1 used, the frequency compensation needs to be adjusted correspondingly. As show in
Figure 7, adding a capacitor in paralleled with RFB1 or increasing the compensation capacitance at COMP pin
helps the system stability.
Figure 6: Cable Compensation at Various Resistor Divider Values
Figure 7: Frequency Compensation for High RFB1
REV1.1
- JAN 2016 RELEASED, SEP 2016 UPDATED -
- 12 -
AITSEMI [ AiT Semiconductor ]
