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參數(shù)資料
| 型號： | TC2574-VOETR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | WIDE, SOIC-16 |
| 文件頁數(shù)： | 20/25頁 |
| 文件大?。?/td> | 212K |
| 代理商： | TC2574-VOETR |
TC2574
4
TC2574-1 1/6/00
0.5A Step-Down Switching Regulator
REPRESENTATIVE BLOCK DIAGRAM AND TYPICAL APPLICATION
PIN DESCRIPTION
Pin No.
Pin No
8-Pin PDIP
16-Pin SOIC
Symbol
Description
512
VIN
This pin is the positive input supply for the TC2574 step–down switching
regulator. In order to minimize voltage transients and to supply the switching
currents needed by the regulator, a suitable input bypass capacitor must be
present (CIN in Figure 1).
7
14
Output
This is the emitter of the internal switch. The saturation voltage VSAT of this
output switch is typically 1.0V. It should be kept in mind that the PCB area
connected to this pin should be kept to a minimum in order to minimize
coupling to sensitive circuitry.
2
4
SIG Gnd
Circuit signal ground pin. See the information about the printed circuit board
layout.
4
6
PWR GND
Circuit power ground pin. See the information about the printed circuit board
layout.
1
3
FB
This pin senses regulated output voltage to complete the feedback loop. The
signal is divided by the internal resistor divider network R2, R1 and applied to
the non–inverting input of the internal error amplifier.In the adjustable version
of the TC2574 switching regulator, this pin is the direct input of the error
amplifier and the resistor network R2, R1 is connected externally to allow
programming of the output voltage.
3
5
ON/OFF
It allows the switching regulator circuit to be shut down using logic level
signals, thus dropping the total input supply current to approximately 80
A.
The input threshold voltage is typically 1.5V. Applying a voltage above this
value (up to +VIN ) shuts the regulator off. If the voltage applied to this pin is
ower than 1.5 V or if this pin is left open, the regulator will be in the “on”
condition.
TC2574
+
–
+
–
3.1V Internal
Regulator
ON/OFF
Latch
Freq.
Shift
18kHz
Reset
Thermal
Shutdown
3
7
1.0 Amp
Switch
D1
L1
COUT
+VIN
CIN
VOUT
Driver
Output
PWR GND
1
5
2
For Adjustable version
R1 = open, R2 = 0
Load
Feedback
Unregulated
DC Input
SIG GND
R1
R2
1.0k
Current
Limit
Comparator
Fixed gain
Error Amplifier
+
–
52kHz
Oscillator
1.235V
Band-Gap
Reference
4
Output
Voltage Versions
3.3V
5.0V
12V
R2 (
)
1.7k
3.1k
8.84k
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC2574VPA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TC2574-VPA | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:0.5A Step-Down Switching Regulator |
| TC2575 | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:1.0A Step-Down Switching Regulator |
| TC2575-12.0VAT | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:1.0A Step-Down Switching Regulator |
| TC2575-3.3VAT | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:1.0A Step-Down Switching Regulator |
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