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CS52845EDR8 Arkusz danych(PDF) 5 Page - ON Semiconductor

Numer części CS52845EDR8
Szczegółowy opis  Current Mode PWM Control
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Setting the Oscillator
The times Tc and Td can be determined as follows:
Grounding
High peak currents associated with capacitive loads neces-
sitate careful grounding techniques. Timing and bypass
capacitors should be connected close to Gnd in a single
point ground.
The transistor and 5k
Ω potentiometer are used to sample
the oscillator waveform and apply an adjustable ramp to
Sense.
5
Vupper
Vlower
ton
toff
tc
td
ton=tc
toff=tc+2td
Circuit Description:: continued
Substituting in typical values for the parameters in the
above formulas:
VREF = 5.0V, Vupper = 2.7V, Vlower = 1.0V, Id = 8.3mA,
then
tc ≈ 0.5534RTCT
td = RTCT ln
For better accuracy RT should be ≥10kΩ.
)
2.3 - 0.0083 RT
4.0 - 0.0083 RT
(
VCC
IO
VO
Switch
Current
EA Output
Toggle
F/F Output
OSC
RESET
VOSC
Figure 2: Timing Diagram
Figure 3: Duty Cycle parameters.
tc = RTCT ln
td = RTCT ln
)
VREF - IdRT - Vlower
VREF - IdRT - Vupper
(
)
VREF - Vlower
VREF - Vupper
(


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