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CS2842ALN8 Datasheet(PDF) 7 Page - ON Semiconductor

Part # CS2842ALN8
Description  Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS2842ALN8 Datasheet(HTML) 7 Page - ON Semiconductor

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CS2842A, CS3842A, CS2843A, CS3843A
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7
tc + RTCT ln
VREF * Vlower
VREF * Vupper
td + RTCT ln
VREF * IdRT * Vlower
VREF * IdRT * Vupper
Substituting in typical values for the parameters in the
above formulas:
VREF = 5.0 V
Vupper = 2.7 V
Vlower = 1.0 V
Id = 8.3 mA
tc ≈ 0.5534RTCT
td + RTCT ln
2.3 * 0.0083RT
4.0 * 0.0083RT
The frequency and maximum duty cycle can be
determined using the Typical Performance Characteristic
graphs.
Grounding
High peak currents associated with capacitive loads
necessitate careful grounding techniques. Timing and
bypass capacitors should be connected close to GND pin in
a single point ground.
The transistor and 5.0 kΩ potentiometer, shown in the test
circuit, are used to sample the oscillator waveform and apply
and adjustable ramp to Sense.
Figure 7. Oscillator Timing Network and
Parameters
Internal Clock
Triangular Mode
VOSC
VOSC
Internal Clock
Small RT (≈ 700 kΩ)
Large RT (≈ 10 kΩ)
Sawtooth Mode
Timing Parameters
Vupper
Vlower
tc
td
VREF
OSC
GND
RT
CT


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