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参数资料
| 型号： | TC2576-12.0VAT |
| 元件分类： | 稳压器 |
| 英文描述： | 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| 封装： | TO-220, 5 PIN |
| 文件页数： | 20/25页 |
| 文件大小： | 213K |
| 代理商： | TC2576-12.0VAT |
TC2576
4
TC2576-2 12/04/00
3.0A Step-Down Switching Regulator
2001 Microchip Technology Inc.
DS21399A
REPRESENTATIVE BLOCK DIAGRAM AND TYPICAL APPLICATION
TC2576
+
–
+
–
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
R2 (
)
1.7k
3.1k
8.84k
PIN DESCRIPTION
Pin No.
5-Pin TO-220
Symbol
Description
1VIN
This pin is the positive input supply for the TC2576 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 1.5V. 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 board
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 TC2576 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 toapproximately 80
A.
The threshold voltage is typically 1.4V. Applying a voltage above this
value (up to +VIN) shuts theregulator 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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