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參數(shù)資料
| 型號： | TC2575-12.0VAT |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁數(shù)： | 21/26頁 |
| 文件大?。?/td> | 172K |
| 代理商： | TC2575-12.0VAT |
TC2575
1.0A Step-Down Switching Regulator
4
TC2575-1 3/13/00
2001 Microchip Technology Inc.
DS21398A
REPRESENTATIVE BLOCK DIAGRAM AND TYPICAL APPLICATION
TC2575
+
–
+
–
3.1V Internal
Regulator
ON/OFF
Latch
Freq.
Shift
18kHz
Reset
Thermal
Shutdown
5
2
1.0 Amp
Switch
D1
L1
COUT
+VIN
CIN
VOUT
Driver
Output
GND
4
1
For Adjustable version
R1 = open, R2 = 0
Load
Regulated
Output
Feedback
Unregulated
DC Input
R2
R1
1.0k
Current
Limit
Comparator
Fixed gain
Error Amplifier
+
–
52kHz
Oscillator
1.235V
Band-Gap
Reference
3
Output
Voltage Versions
3.3V
5.0V
12V
15V
R2 (
)
1.7k
3.1k
8.84k
11.3k
PIN DESCRIPTION
Pin No.
5-Pin TO-220
Symbol
Description
1VIN
This pin is the positive input supply for the TC2575 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).
2
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.
3
GND
Circuit ground pin. See the information about the printed circuit
boad layout.
4
Feedback
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
TC2575 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.
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 threshold voltage is typically 1.4V.
Applying a voltage above this value (up to +VIN) shuts the
regulator off. If the voltage applied to this pin is lower than 1.4V
or if this pin is left open, the regulator will be in the "on" condition.
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