PDF TC2575 Data sheet ( Hoja de datos )

Número de pieza	TC2575
Descripción	Step-Down Switching Regulator
Fabricantes	TelCom Semiconductor
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No Preview Available ! www.DataSheet4U.com 1.0A Step-Down Switching Regulator TTCC2255775 1.0A Step-Down Switching Regulator FEATURES s 3.3V, 5.0V, 12V, and Adjustable Output Versions s Adjustable Version Output Voltage Range of 1.23V to 37V ±4% Max. Over Line and Load Conditions s Guaranteed 1.0 A Output Current s Wide Input Voltage Range; 4.75V 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 GENERAL DESCRIPTION PIN CONFIGURATIONS The TC2575 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 1.0A 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 TC2575 are offered by several different inductor manu- facturers. Since the TC2575 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 many cases, the power dissipated is so low, that no heatsinking is required or its size can be reduced dramatically. The TC2575 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 80µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. 5-Pin TO-220 TC2575 1 2 345 ORDERING INFORMATION Part Number Package TC2575-3.3VAT 5-Pin TO-220 TC2575-5.0VAT 5-Pin TO-220 TC2575-12.0VAT* 5-Pin TO-220 TC2575VAT** 5-Pin TO-220 Note: * Contact factory for availability ** ADJ = 1.23 To 37V. Temperature Range –40 to +125°C –40 to +125°C –40 to +125°C –40 to +125°C TC2575-1 3/13/00 TelCom Semiconductor reserves the right to make changes in the circuitry an1d specifications of its devices. 1 page 1.0A Step-Down Switching Regulator TC2575 7.0 – 40V Unregulated DC Input CIN 100µF +VIN +1 Feedback 4 TC2575 Output 2 3 GND 5 ON/OFF L1 330µH D1 1N5819 5.0V Regulated Output 1.0A Load COUT 330µF Figure 1. Block Diagram and Typical Application: Fixed Output Voltages VIN Unregulated DC Input 8.0 – 40V 5.0 Output Voltage Versions VIN 1 TC2575 (5V) + CIN 3 GND 100µF/50V 5 Feedback 4 Output L1 330µH VOUT Regulated Output 2 ON/OFF COUT + D1 330µF/16V IN5819 Load Unregulated DC Input 8.0 – 40V Adjustable Output Voltage Versions Feedback VIN 1 3 + CIN 100µF/50V 4 TC2575 Adjustable Output 2 GND 5 ON/OFF L1 330µH D1 IN5819 + CIN 330µF/ 16V VOUT Regulated Output R2 Load R1 ( )VOUT = VREF 1 + R2 R1 ( )R1= R2 VOUT - 1 VREF Where VREF = 1.23V, R1 between 1.0kΩ and 5.0kΩ Figure 2. Typical Test Circuit TC2575-1 3/13/00 5 5 Page 1.0A Step-Down Switching Regulator TC2575 Table 2. Inductor Selection Guide Inductance Current Schott Renco Pulse Engineering Coilcraft (µH) (A) THT SMT THT SMT THT SMT SMT 68 0.32 67143940 67144310 RL–1284–68–43 RL1500–68 PE–53804 PE–53804–S DO1608–68 0.58 67143990 67144360 RL–5470–6 RL1500–68 PE–53812 PE–53812–S DO3308–683 0.99 67144070 67144450 RL–5471–5 RL1500–68 PE–53821 PE–53821–S DO3316–683 1.78 67144140 67144520 RL–5471–5 – PE–53830 PE–53830–S DO5022P–683 100 0.48 67143980 67144350 RL–5470–5 RL1500–100 PE–53811 PE–53811–S DO3308–104 0.82 67144060 67144440 RL–5471–4 RL1500–100 PE–53820 PE–53820–S DO3316–104 1.47 67144130 67144510 RL–5471–4 – PE–53829 PE–53829–S DO5022P–104 150 0.39 – 67144340 RL–5470–4 RL1500–150 PE–53810 PE–53810–S DO3308–154 0.66 67144050 67144430 RL–5471–3 RL1500–150 PE–53819 PE–53819–S DO3316–154 1.20 67144120 67144500 RL–5471–3 – PE–53828 PE–53828–S DO5022P–154 220 0.32 67143960 67144330 RL–5470–3 RL1500–220 PE–53809 PE–53809–S DO3308–224 0.55 67144040 67144420 RL–5471–2 RL1500–220 PE–53818 PE–53818–S DO3316–224 1.00 67144110 67144490 RL–5471–2 – PE–53827 PE–53827–S DO5022P–224 330 0.42 67144030 67144410 RL–5471–1 RL1500–330 PE–53817 PE–53817–S DO3316–334 0.80 67144100 67144480 RL–5471–1 – PE–53826 PE–53826–S DO5022P–334 Note: Table 1 and Table 2 of this Indicator Selection Guide shows some examples of different manufacturer products suitable for design with the TC2575. Table 3. Example of Several Inductor Manufacturers Phone/Fax Numbers Pulse Engineering Inc. Pulse Engineering Inc. Europe Renco Electronics Inc. AIE Magnetics Coilcraft Inc. Coilcraft Inc., Europe Tech 39 Schott Corp. Phone Fax Phone Fax Phone Fax Phone Fax Phone Fax Phone Fax Phone Fax Phone Fax + 1–619–674–8100 + 1–619–674–8262 + 353 93 24 107 + 353 93 24 459 + 1–516–645–5828 + 1–516–586–5562 + 1–813–347–2181 + 1–708–322–2645 + 1–708–639–1469 + 44 1236 730 595 + 44 1236 730 627 + 33 8425 2626 + 33 8425 2610 + 1–612–475–1173 + 1–612–475–1786 TC2575-1 3/13/00 11 11 Page

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