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CS3845GDR8 Datasheet(PDF) 5 Page - Cherry Semiconductor Corporation

Part # CS3845GDR8
Description  Current Mode PWM Control Circuit with 50% Max Duty Cycle
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Manufacturer  CHERRY [Cherry Semiconductor Corporation]
Direct Link  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS3845GDR8 Datasheet(HTML) 5 Page - Cherry Semiconductor Corporation

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5
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 5kΩ potentiometer are used to sample
the oscillator waveform and apply an adjustable ramp to
Sense.
ton
toff
Vupper
Vlower
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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