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參數(shù)資料
| 型號： | PJ3845BCS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, SOP-8 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大小： | 841K |
| 代理商： | PJ3845BCS |
PJ3844B / PJ3845B
High Performance Current Mode Controller
6-14
2002.rev. A
FIGURE 13-OUTPUT CROSS CONDUCTION
VOLTAGE
FIGURE 14-SUPPLY CURRENT versus SUPPLY
PIN FUNCTION DESCRIPTION
Pin No.
Function
Description
1
2
3
4
5
6
7
8
Compensation
Voltage Feedback
Current Sense
RT/CT
Gnd
Output
Vcc
Vref
This pin is the Error Amplifier output and is made available for loop
compensation
This is the inverting input of the Error Amplifier. It is normally
connected to the switching power supply output through a resistor
divider.
A voltage proportional to inductor current is connected to this input.
The PWM uses this information to terminate the output switch
conduction.
The Oscillator Frequency and maximum Output duty are programmed
by connecting resistor RT to Vref and capacitor CT to ground .Oscillator
operation to 1.0MHz is possible.
This pin is the combined control circuity and power ground (8-pin
package only).
This output directly drives the gate of a power MOSFET.Peak current
up to 1.0A are sourced and sunk by this pin.The output switchs at one-
half the oscillator frequency.
This pin is the positive supply of the control IC.
This pin is the reference output . It provides charging current for
capacitor CT through resistor RT.
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| PJ431BCY | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495 V, PSSO3 |
| PJ431BCS | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495 V, PDSO8 |
| PJ431ACS | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495 V, PDSO8 |
| PJ431ACY | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495 V, PSSO3 |
| PJ431ACX | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495 V, PDSO3 |
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