AP63201
EVB User Guide
This EVB User Guide contains new product information. Diodes, Inc. reserves the right to modify the product specification without
notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
June 2019
© Diodes Incorporated
network has a phase margin between 60 and 90 degree. However, if the output capacitor has ultra-low ESR,
the converter results in low phase margin. To increase the converter phase margin, a feed-forward cap C4 is
used to boost the phase margin at the converter cross-over frequency,
. The feed-forward capacitor is
given by Table 1 for reference. The feed-forward capacitor is calculated as below,
Table 1. Resistor selection for output voltage setting
8. External Components Selection
1) Input & output Capacitors (Cin, Cout)
(1) For lower output ripple, low ESR is required.
(2) Low leakage current needed, X5R/X7R ceramic recommend, multiple capacitor parallel
connection.
(3) The Cin capacitances are greater than 10uF.
(4) 44μF ceramic output capacitors recommended work for most applications, ue to a capacitor’s
de-rating under DC bias, The 88uF is recommend for high output voltage condition. the output
capacitor choose is shown on table1.
2) Bootstrap Voltage Regulator
(1)An external 0.1uF ceramic capacitor is required as bootstrap capacitor between BST and SW pin to
work as high side power MOSFET gate driver.
3) Inductor (L)
(1) Low DCR for good efficiency
(2) Inductance saturate current must higher than the output current
(3) The recommended inductance is shown in the table 2 below.
