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TC2575VAT Folha de dados(PDF) 19 Page - TelCom Semiconductor, Inc

Nome de Peças TC2575VAT
Descrição Electrónicos  1.0A Step-Down Switching Regulator
PDF  25 Pages
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Fabricante Electrônico  TELCOM [TelCom Semiconductor, Inc]
Página de início  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC2575VAT Folha de dados(HTML) 19 Page - TelCom Semiconductor, Inc

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TC2575
TC2575-1 3/13/00
1.0A Step-Down Switching Regulator
Undervoltage Lockout
Some applications require the regulator to remain off
until the input voltage reaches a certain threshold level.
Figure 14 shows an undervoltage lockout circuit applied to
a buck regulator. A version of this circuit for buck–boost
converter is shown in Figure 14. Resistor R3 pulls the
ON/OFF pin high and keeps the regulator off until the input
voltage reaches a predetermined threshold level, with re-
spect to the ground Pin 3, which is determined by the
following expression:
VTH
≈ V
Z1 +
(1.0 +
R2 ) VBE (Q1)
R1
Figure 14. Undervoltage Lockout Circuit for Buck Converter
R2
10k
Z1
1N5242B
R1
10k
Q1
2N3904
R3
47k
CIN
100
µF
TC2575
(5V)
1
3
5
GND
VTH ≈ 13V
ON/OFF
+VIN
+VIN
NOTE: This picture does not show the complete circuit.
Figure 15. Undervoltage Lockout Circuit for Buck-Boost Converter
R2
15k
Z1
1N5242B
R1
15 k
Q1
2N3904
R3
68k
CIN
100
µF
TC2575
(5V)
1
3
5
GND
VTH ≈ 13V
ON/OFF
+VIN
+VIN
VOUT
= –5.0V
NOTE: This picture does not show the complete circuit
Figure 13. Delayed Startup Circuitry
R1
47k
LM2575
1
3
5
GND
ON/OFF
R2
47k
+VIN
+VIN
C1
0.1
µF
CIN
100
µF
NOTE
: : This picture does not show the complete circuit.
Adjustable Output, Low-Ripple Power Supply
A 1.0A output current capability power supply that
features an adjustable output voltage is shown in Figure 16.
This regulator delivers 1.0A into 1.2 to 35V output. The
input voltage ranges from roughly 8.0 to 40V. In order to
achieve a 10 or more times reduction of output ripple, an
additional L-C filter is included in this circuit.



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