k鈩?/div>
60
180
Figure 7.
The programmable UVLO circuit incorporates 20% hysteresis from the start voltage to the shutdown voltage. For
example, if the startup voltage is programmed to be 10 V, the controller starts when V
DD
reaches 10 V and shuts
down when V
DD
falls below 8 V. The maximum duty cycle begins to decrease as the input voltage rises to twice
the startup voltage. Below this point, the maximum duty cycle is as specified in the electrical table. Note that with
11