AN611

6

Rev. 0.2

2. Adjusting Converter Performance

The gate driver used in this reference design is a general-purpose driver that can be used to drive any high- and

low-side drive with the proper selection of components. The selection of the bootstrap capacitor and resistor is

important (see "1.1. Gate Driver Circuits" on page 2 for details). Increasing the gate drive current requires higher

current drive transistors (e.g. Q1 and Q2 in Figure 2).

2.1. Changing Output Voltage

The dc-dc converter can be adapted for different output voltages by modifying the turns-ratio of the isolation

transformer. The secondary rectifiers (diodes D1 and D2 shown in Figure 1) should be rated for at least twice the

maximum clamped voltage at the input to the linear regulator. In practice, it is recommended to use at least 50%

overhead above this value to accommodate the voltage spikes due to circuit parasitics. The output filter capacitor

should also be rated according to the maximum output voltage generated.