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PM8803TR 데이터시트(PDF) 25 Page - STMicroelectronics

부품명 PM8803TR
상세설명  High-efficiency, IEEE 802.3at compliant integrated PoE-PD interface and PWM controller
PDF  34 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM8803TR 데이터시트(HTML) 25 Page - STMicroelectronics

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PM8803
PWM controller
Doc ID 018559 Rev 2
25/34
5
PWM controller
5.1
Oscillator
The internal oscillator frequency can be programmed by connecting an external resistor RT
between the FRS and ARTN pins. The relationship between the oscillator frequency FOSC
and the RT resistor is:
The PWM switching frequency is equal to the programmed oscillator frequency.
The useful range for RT is between 20 k to 200 kOhm
Figure 11.
PWM frequency vs. RT
5.2
Delay time control
The delay between the rising edge of GAT2 and GAT1 waveforms can be set by putting a
programming resistor RDT between DT and AGND or VB. The relationship between the
delay time and the RDT resistor is:
F
osc kHz
()
25000
3k
Ω R
+
T kΩ
()
-------------------------------------
=
0
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0
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FOSC [kHz]
RT [kOhm]
AM045101v1
t
del ns
()
1.6R
DT kOhm
()
=



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