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CS52843EDR8 датащи(PDF) 5 Page - Cherry Semiconductor Corporation

номер детали CS52843EDR8
подробное описание детали  Current Mode PWM Control Circuit
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производитель  CHERRY [Cherry Semiconductor Corporation]
домашняя страница  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS52843EDR8 датащи(HTML) 5 Page - Cherry Semiconductor Corporation

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When the power supply sees a sudden large output cur-
rent increase, the control voltage will increase allowing the
duty cycle to momentarily increase. Since the duty cycle
tends to exceed the maximum allowed to prevent trans-
former saturation in some power supplies, the internal
oscillator waveform provides the maximum duty cycle
clamp as programmed by the selection of oscillator timing
components.
Figure 2: Timing Diagram
Figure 3: Oscillator Timing Network and Parameters
Setting the Oscillator
The times Tc and Td can be determined as follows:
tc = RTCT ln
td = RTCT ln
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.
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.
)
2.3 - 0.0083 RT
4.0 - 0.0083 RT
(
)
VREF - IdRT - VLOWER
VREF - IdRT - VUPPER
(
)
VREF - VLOWER
VREF - VUPPER
(
VCC
IO
VO
Switch
Current
EA Output
Toggle
F/F Output
OSC
RESET
VOSC
5
Circuit Description
VREF
OSC
Gnd
RT
CT
Vupper
Vlower
tc
td
VOSC
Internal Clock
LARGE RT (≈10kΩ)
VREF
Internal Clock
SMALL RT (≈700kΩ)
Triangular Mode
Sawtooth Mode


Аналогичный номер детали - CS52843EDR8

производительномер деталидатащиподробное описание детали
logo
ON Semiconductor
CS52843EDR8 ONSEMI-CS52843EDR8 Datasheet
240Kb / 9P
   Current Mode PWM Control Circuit
July, 2006 ??Rev. 4
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Аналогичное описание - CS52843EDR8

производительномер деталидатащиподробное описание детали
logo
ON Semiconductor
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CS2844 ONSEMI-CS2844 Datasheet
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logo
Cherry Semiconductor Co...
CS3842B CHERRY-CS3842B Datasheet
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ON Semiconductor
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NTE Electronics
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NTE7098 NTE-NTE7098 Datasheet
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