P-Channel Active Clamp

(RSET to GND)

N-Channel Active Clamp

(RSET to REF)

OUT_A

OUT_B

OUT_A

OUT_B

LM5025D

www.ti.com

SNVSAB0 – JUNE 2015

Typical Application (continued)

8.2.2.3 Feed-Forward Ramp and Maximum On Time Clamp

An example illustrates the use of the Volt x Second Clamp comparator to achieve a 50% duty cycle limit, at

200bKHz, at a 48-V line input: A 50% duty cycle at a 200 KHz requires a 2.5 µs of ON time. At 48-V input the

Volt x Second product is 120 V x µs (48 V x 2.5 µs). To achieve this clamp level:

(4)

48 x 2.5 µF / 2.5 = 48 µF

(5)

8.2.2.4 Dead Times

The magnitude of the overlap/dead time can be calculated as follows:

Figure 15. PWM Outputs

Copyright © 2015, Texas Instruments Incorporated

Submit Documentation Feedback

21

Product Folder Links: LM5025D