- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄300050 > UCC284SDR-12EP (TEXAS INSTRUMENTS INC) 12 V FIXED NEGATIVE LDO REGULATOR, 0.5 V DROPOUT, PDSO8 PDF資料下載
參數(shù)資料
| 型號： | UCC284SDR-12EP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 固定負電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 12 V FIXED NEGATIVE LDO REGULATOR, 0.5 V DROPOUT, PDSO8 |
| 封裝： | PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 2/21頁 |
| 文件大小： | 506K |
| 代理商： | UCC284SDR-12EP |
short-circuit timing
V
OUT +
I
PEAK
R
L
(2)
t
ON +
CT (mF)
1 V
40 mA
seconds
(3)
t
OFF +
CT (mF)
1 V
1 mA
seconds
(4)
capacitive loads
C
OUT(max) +
I
PEAK
(A) * ILOAD(A)
t
ON
(sec)
V
OUT
(V)
Farads
(5)
C
OUT(max) +
t
ON
(sec)
R
LOAD
(W)
n
1
1*
V
OUT
(V)
I
MAX
(A)
R
LOAD
(W)
Farads
(6)
SLVS862A – NOVEMBER 2008 – REVISED NOVEMBER 2008 ....................................................................................................................................... www.ti.com
During normal operation the output voltage is in regulation and the SD/CT pin is held to -1.5 V via a 50-k
internal-source impedance. If the output-current rises above the overcurrent threshold, the CT capacitor is
charged by a 40-
A current sink. The voltage on the SD/CT pin moves in a negative direction with respect to
GND.
During an overcurrent condition, the regulator actively limits the maximum output current to the peak-current limit.
This limits the output voltage of the regulator to:
If the output current stays above the overcurrent threshold, the voltage on the SD/CT pin reaches –2.6 V with
respect to GND and the output turns off. The CT capacitor is then discharged by a 1-
A current source. When
the voltage on the SD/CT pin reaches –1.6 V with respect to GND, the output turns back on. This process
repeats until the output current falls below the overcurrent threshold.
tON, the time the output is on during an overcurrent condition is determined by the following equation:
tOFF, the time the output is off during an overcurrent condition is determined by the following equation:
A capacitive load on the regulator's output appears as a short-circuit during start-up. If the capacitance is too
large, the output voltage does not begin to regulate during the initial tON period and the UCC284 enters a pulsed
mode operation. For a constant current load the maximum allowed output capacitance is calculated as follows:
For worst case calculations, the minimum value for tON should be used, which is based on the value of CT
capacitor selected. For a resistive load the maximum output capacitor can be estimated as follows:
Figure 6 and Figure 7 are oscilloscope photos of the UCC284-ADJ operating during an overcurrent condition.
Figure 6 shows operation of the circuit as the output current initially rises above the overcurrent threshold. This is
shown on a 1 ms/div. scale. Figure 7 shows operation of the same circuit on a 25 ms/div. scale showing one
complete cycle of operation during an overcurrent condition.
10
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): UCC284-EP
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UCC284SDR-5EP | 5 V FIXED NEGATIVE LDO REGULATOR, 0.55 V DROPOUT, PDSO8 |
| UCN5804B | STEPPER MOTOR CONTROLLER, 1.5 A, PDIP16 |
| UDQ2916LB-T | STEPPER MOTOR CONTROLLER, 1 A, PDSO24 |
| UE25-CM55-10H | 5 CONTACT(S), FEMALE, RIGHT ANGLE TELECOM AND DATACOM CONNECTOR, SURFACE MOUNT, RECEPTACLE |
| UE25-CM55-1AH | 5 CONTACT(S), FEMALE, RIGHT ANGLE TELECOM AND DATACOM CONNECTOR, SURFACE MOUNT, RECEPTACLE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC284SDR-5EP | 功能描述:低壓差穩(wěn)壓器 - LDO EP Sgl Out LDO,500mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| UCC28500 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BiCMOS PFC/PWM Combination Controller |
| UCC28500-12 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BiCMOS PFC/PWM COMBINATION CONTROLLER |
| UCC28500DW | 功能描述:功率因數(shù)校正 IC BiCMOS PFC/PWM Comb Controller RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UCC28500DWG4 | 功能描述:功率因數(shù)校正 IC BiCMOS PFC/PWM Comb Controller RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復。