|
|
PDF TC2574 Data sheet ( Hoja de datos )
| Número de pieza | TC2574 | |
| Descripción | Step-Down Switching Regulator | |
| Fabricantes | TelCom Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de TC2574 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
0.5A Step-Down Switching Regulator
TTCC2255774
0.5A Step-Down Switching Regulator
FEATURES
s 3.3V, 5.0V, 12V and Adjustable Output Versions
s Adjustable Version Output Voltage Range,
1.23 to 37 V ±4% Max Over Line and Load Conditions
s Guaranteed 0.5 A Output Current
s Wide Input Voltage Range: 4.75 to 40V
s Requires Only 4 External Components
s 52kHz Fixed Frequency Internal Oscillator
s TTL Shutdown Capability, Low Power Standby Mode
s High Efficiency
s Uses Readily Available Standard Inductors
s Thermal Shutdown and Current Limit Protection
APPLICATIONS
s Simple and High–Efficiency Step–Down (Buck)
Regulator
s Efficient Pre-Regulator for Linear Regulators
s On–Card Switching Regulators
s Positive to Negative Converters (Buck–Boost)
s Negative Step-Up Converters
s Power Supply for Battery Chargers
PIN CONFIGURATIONS
16-Pin SOIC (Wide)
NC 1
NC 2
FB 3
SIG GND 4
ON/OFF 5
PWR GND 6
NC 7
NC 8
TC2574
16 NC
15 NC
14 OUTPUT
13 NC
12 VIN
11 NC
10 NC
9 NC
8-Pin PDIP (Narrow)
FB 1
SIG GND 2
ON/OFF 3
PWR GND 4
TC2574
8 NC
7 OUTPUT
6 NC
5 VIN
GENERAL DESCRIPTION
The TC2574 series of regulators are monolithic inte-
grated circuits ideally suited for easy and convenient design
of a step-down switching regulator (buck converter). All
circuits of this series are capable of driving a 0.5A load with
excellent line and load regulation. These devices are avail-
able in fixed output voltages of 3.3V, 5.0V, 12V and
an adjustable output version.
These regulators were designed to minimize the num-
ber of external components to simplify the power supply
design. Standard series of inductors optimized for use with
the TC2574 are offered by several different inductor manu-
facturers.
Since the TC2574 converter is a switch–mode power
supply, its efficiency is significantly higher in comparison
with popular three-terminal linear regulators, especially with
higher input voltages. In most cases, the power dissipated
by the TC2574 regulator is so low, that the copper traces on
the printed circuit board are normally the only heatsink
needed and no additional heatsinking is required.
The TC2574 features include a guaranteed ±4% toler-
ance on output voltage within specified input voltages and
output load conditions, and ±10% on the oscillator frequency
(±2% over 0°C to +125°C). External shutdown is included,
featuring 60µA (typical) standby current. The output switch
includes cycle–by–cycle current limiting, as well as thermal
shutdown for full protection under fault conditions.
ORDERING INFORMATION
Part
Number
Package
Temperature
Range
TC2574-3.3VPA
TC2574-5.0VPA
TC2574-12.0VPA
TC2574-VPA*
TC2574-VOE*
8-Pin PDIP (Narrow) –40 to +125°C
8-Pin PDIP (Narrow) –40 to +125°C
8-Pin PDIP (Narrow) –40 to +125°C
8-Pin PDIP (Narrow) –40 to +125°C
16-Pin SOIC (Wide) –40 to +125°C
Note: *ADJ = 1.23 To 37V.
TC2574-1 1/6/00 TelCom Semiconductor reserves the right to make changes in the circuitry an1d specifications of its devices.
1 page  
0.5A Step-Down Switching Regulator
TC2574
7.0 – 40V
Unregulated
DC Input
CIN
22µF
+VIN
+5
2
Feedback
1
TC2574
Output
7
Sig 4 PWR 3 ON/OFF
GND GND
L1
330µH
D1 COUT
220µF
5.0V Regulated
Output 0.5A Load
Figure 1. Block Diagram and Typical Application: Fixed Output Versions
Test CIrcuit and Layout Guidelines
7.0 – 40V
Unregulated
DC Input
VIN
5
+ CIN 4
22µF
TC2574
Fixed Output
PWR 2 Sig 3
GND GND
1
Output
7
ON/OFF
L1
330µH
D1
1N5819
COUT +
220µF
VOUT
Load
CIN - 22µF, 60V, Aluminum Electrolytic
COUT - 220µF, 25V, Aluminum Electrolytic
D1 - Schottky, 1N5819
L1 - 2.0k,0.1%
R2 - 6.12k, 0.1%
Adjustable Output Voltage Versions
7.0 – 40V
Unregulated
DC Input
VIN
5
4
+ CIN
22µF
TC2574
Adjustable
PWR 2 Sig 3
GND GND
1
Output
7
ON/OFF
L1
330µH
D1 +
1N5819
COUT
220µF
VOUT
5.0V
R2
6.12k Load
R2
6.12k
( )VOUT = VREF 1.0 + R2
R1
( )R1= R2 VOUT - 1.0
VREF
Where VREF = 1.23V, R1
between 1.0kΩ and 5.0kΩ
TC2574-1 1/6/00
Figure 2. Test Circuit and Layout Guidelines
5
5 Page 
0.5A Step-Down Switching Regulator
Table 2. Inductor Selection Guide
Inductor Value
Pulse Engineering
68µH
*
100µH
*
150µH
52625
220µH
52626
330µH
52627
470µH
52628
680µH
52629
1000µH
52631
1500µH
*
2200µH
*
Tech 89
55 258 SN
55 308 SN
55 356 SN
55 406 SN
55 454 SN
*
55 504 SN
55 554 SN
*
*
TC2574
Renco
RL–1284–68
RL–1284–100
RL–1284–150
RL–1284–220
RL–1284–330
RL–1284–470
RL–1284–680
RL–1284–1000
RL–1284–1500
RL–1284–2200
NPI
NP5915
NP5916
NP5917
NP5918/5919
NP5920/5921
NP5922
NP5923
*
*
*
Table 3. Example of Several Inductor Manufacturers Phone/Fax Numbers
Pulse Engineering Inc.
Phone
Fax
+ 1–619–674–8100
+ 1–619–674–8262
Pulse Engineering Inc. Europe
Renco Electronics Inc.
Tech 39
NPI/APC
Phone
Fax
Phone
Fax
Phone
Fax
Phone
Fax
+ 353–9324–107
+ 353–9324–459
+ 1–516–645–5828
+ 1–516–586–5562
+ 33–1–4115–1681
+ 33–1–4709–5051
+ 44–634–290–588
TC2574-1 1/6/00
11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet TC2574.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| TC2571 | PHEMT GaAs Power FETs |  Transcom |
| TC2574 | Step-Down Switching Regulator | TelCom Semiconductor |
| TC2575 | Step-Down Switching Regulator | TelCom Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |