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CS2841BED14 データシート(PDF) 5 Page - Cherry Semiconductor Corporation

部品番号 CS2841BED14
部品情報  Automotive Current Mode PWM Control Circuit
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メーカー  CHERRY [Cherry Semiconductor Corporation]
ホームページ  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS2841BED14 データシート(HTML) 5 Page - Cherry Semiconductor Corporation

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5
former saturation in some power supplies, the internal
oscillator waveform provides the maximum duty cycle
clamp as programmed by the selection of OSC compo-
nents.
Setting the Oscillator
Oscillator timing capacitor, CT, is charged by VREF through
RT and discharged by an internal current source. During
the discharge time, the internal clock signal blanks out the
output to the Low state, thus providing a user selected
maximum duty cycle clamp. Charge and discharge times
are determined by the general formulas:
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
tc ≈ 0.5534RTCT
td = RTCT ln
The frequency and maximum duty cycle can be deter-
mined from the Typical Performance Characteristic
graphs.
Grounding
High peak currents associated with capacitive loads neces-
sitate careful grounding techniques. Timing and bypass
capacitors should be connected close to Gnd pin in a sin-
gle 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
(
VREF
OSC
Gnd
RT
CT
Circuit Description: continued
VOSC
Internal Clock
LARGE RT (≈10kΩ)
VOSC
Internal Clock
SMALL RT (≈700kΩ)
Sawtooth Mode
Triangular Mode
Vupper
Vlower
tc
td
VCC
IO
VO
Switch
Current
EA Output
OSC
OSC
RESET
Figure 2: Timing Diagram for key CS2841B parameters
Figure 3: Oscillator Timing Network and parameters
Timing parameters


同様の部品番号 - CS2841BED14

メーカー部品番号データシート部品情報
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ON Semiconductor
CS2841BED14 ONSEMI-CS2841BED14 Datasheet
100Kb / 10P
   Automotive Current Mode PWM Control Circuit
September, 2005 ??Rev. 7
CS2841BED14G ONSEMI-CS2841BED14G Datasheet
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   Automotive Current Mode PWM Control Circuit
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同様の説明 - CS2841BED14

メーカー部品番号データシート部品情報
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ON Semiconductor
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September, 2005 ??Rev. 7
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