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參數(shù)資料
| 型號： | UCC81510N |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Transition-mode PFC controller |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 196K |
| 代理商： | UCC81510N |
SLUS457B – JULY 2000 - REVISED OCTOBER 2000
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
pin descriptions
CT:
A capacitor connected to this pin sets the maximum fault time. The maximum time must be greater than
the time to charge external load capacitance. The nominal fault time is defined as:
TFAULT
22.2
103
CT
Once the fault time is reached, the output shuts down for a time given by:
TSD
0.667
106
CT
This equates to a 3% duty cycle. The recommended minimum value for the C
T
capacitor is 0.1
μ
F.
FAULT:
Open-drain output, which pulls low on any condition that causes the output to open; fault, thermal
shutdown, shutdown, and maximum sourcing current greater than the fault time.
GND:
This is the most negative voltage in the circuit. All 4 ground pins should be used, and properly heat sunk
on the PCB.
IFAULT:
A resistor connected from this pin to ground sets the fault threshold. The resistor versus fault current
is set by the formula:
RFAULT
105 k
ITRIP
IMAX:
A resistor connected from this pin to ground sets the maximum sourcing current. The resistor vs the
output sourcing current is set by the formula:
RIMAX
126 k
Maximum Sourcing Current
SHTDWN:
When this pin is brought low, the IC is put into sleep mode. The input threshold is hysteretic, allowing
the user to program a startup delay with an external RC circuit.
VIN:
This is the input voltage to the UCC2918. The recommended operating voltage range is 3V to 6V. All VIN
pins should be connected together and to the power source.
VOUT:
Output voltage for the circuit breaker. When switched the output voltage will be approximately:
VOUT
VIN
0.075
IOUT.
All VOUT pins should be connected together and to the load.
(1)
(2)
(3)
(4)
(5)
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