ha16150p Renesas Electronics Corporation., ha16150p Datasheet - Page 15

• Manufacturer Part Number: ha16150p
• Description: High-speed Current Mode Push-pull Pwm Control Ic
• Manufacturer: Renesas Electronics Corporation.

HA16150T/P
5. Operating Frequency
The operating frequency is adjusted by means of CT and RT.
Adjustment examples are shown in the graph below. This graph shows driver output operating frequencies. The
reference operating frequency generated at the CT pin is twice the driver output frequency.
The driver output operating frequency can be estimated using the approximate equation shown below.
This is only an approximate equation, and the higher the frequency, the greater will be the degree of error of the
approximate equation due to the effects of CT pin voltage overshoot, undershoot and so forth.
When the operating frequency is adjusted, it is essential to confirm operation using the actual system.
Rev.3.00 Jan 30, 2007 page 15 of 24
fosc =
=
= 210 [kHz]
3 × CT × RT
3 × 470 [pF] × 27 [kΩ]
8
8
=
3 × C6 × R7
10000
1000
100
8
0
100
fosc (RT = 5.1kΩ)
fosc (RT = 10kΩ)
fosc (RT = 27kΩ)
fosc (RT = 75kΩ)
Figure 6
CT (pF)
1000
10000