CS2842A datasheet(5/6 Pages) CHERRY

номер детали	CS2842A

подробное описание детали	Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout

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производитель	CHERRY [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 oscillator com-

ponents.

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 formula:

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 using 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, shown in the test

circuit, 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)

VREF

Internal Clock

SMALL RT (≈700kΩ)

Sawtooth Mode

Triangular Mode

Vupper

Vlower

tc

td

VCC

IOUT

VOUT

Switch

Current

EA Output

VOSC

OSC

RESET

Figure 2: Timing Diagram for key CS2841B parameters

Figure 3: Oscillator Timing Network and parameters

Timing parameters

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ON Semiconductor	CS2842A	273Kb / 10P	Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout July, 2006 ??Rev. 4
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Аналогичное описание - CS2842A

производитель	номер детали	датащи	подробное описание детали
ON Semiconductor	CS2842A	273Kb / 10P	Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout July, 2006 ??Rev. 4
Cherry Semiconductor Co...	CS3842B	154Kb / 6P	Off-Line Current Mode PWM Control Circuit Off-Line Current Mode PWM Control Circuit
ON Semiconductor	CS3842B	68Kb / 8P	Off-Line Current Mode PWM Control Circuit December, 2001 - Rev. 4
STMicroelectronics	STIPN2M50-H	990Kb / 21P	Undervoltage lockout February 2017 Rev 4
Cherry Semiconductor Co...	CS52843	147Kb / 6P	Current Mode PWM Control Circuit
ON Semiconductor	CS52843	240Kb / 9P	Current Mode PWM Control Circuit July, 2006 ??Rev. 4
	CS3845B	63Kb / 8P	Current Mode PWM Control Circuit December, 2001 - Rev. 7
	CS2844	162Kb / 12P	Current Mode PWM Control Circuit June, 2001 ??Rev. 3
STMicroelectronics	STIPN2M50T-HL	1,003Kb / 23P	Undervoltage lockout February 2017 Rev 4
STMicroelectronics	STGIPS10C60T-H	635Kb / 19P	Undervoltage lockout April 2015 Rev 2

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