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PM8801 Datasheet(PDF) 28 Page - STMicroelectronics

No. de pieza PM8801
Descripción Electrónicos  High-efficiency, IEEE 802.3at compliant, integrated PoE-PD interface and PWM controller
PDF  37 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM8801 Datasheet(HTML) 28 Page - STMicroelectronics

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PWM controller
PM8801
28/37
DocID018560 Rev 2
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 from 25 k to 200 kΩ.
Figure 13. 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
100
200
300
400
500
600
700
800
900
1000
1100
0
50
100
150
200
250
FOSC [kHz]
RT [kΩ]
AM045045v1
t
del ns
()
1.6R
DT kΩ
()
=



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