PL2576-XXXF5 CYSTEKEC | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 10

Technical content

Features

z 3.3V, 5V, 12V, 15V, and adjustable output versions. z Adjustable version output voltage range, 1.23V to 37V±4% max over line and load conditions. z Guaranteed 3A output current. z Wide input voltage range. z Requires only 4 external components z 52 kHz fixed frequency oscillator z TTL shutdown capability, low power standby mode. z High efficiency z Uses readily available standard inductors. z Thermal shutdown and current limit protection.

Description

The PL2576-XXXF5 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator. The PL2576-XXXF5 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink is required. A standard series if inductors optimized for use with the PL2576 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

Applications

z Simple high-efficiency step-down (buck) regulator. z Efficient pre-regulator for linear regulators. z On-card switching regulators. z Positive to negative converter (Buck-Boost). TO-263-5L

CYStech Electronics Corp. Spec. No. : C543F5 Issued Date : 2004.02.27 Revised Date : Page No. : 2/10 PL2576-XXXF5 CYStek Product Specification Typical Application (Fixed Output Voltage Version) + ++ 7V-40V unregulated +VIN 4 +5V regulated output PL2576-5.01 GND ON/OFF Feedback Output DC input 3A load Cout 1000μF1N5822 100μH Cin 100μF Block Diagram 1.23V reference 52kHz Oscillator Reset Thermal Current Shutdown Limit Internal Regulator ON / OFF 5 Vin Cin Feedback ON/OFF Output L1 + L O A D GND Cout Vout

3 Amp

1.0k Unregulated DC Input 3.3V, R2=1.7k 5V, R2=3.1k 12V, R2=8.84k 15V, R2=11.3k For Adjustable version, R1=open, R2=0 band-gap

Ordering Information

Output V oltage Temperature Range 3.3 5.0 12 15 ADJ Package Type -40℃≤TA≤125℃ PL2576-3.3F5 PL2576-5.0F5 PL2576-12F5 PL2576-15F5 PL2576-ADJF5 TO-263-5L Figure. 1

CYStech Electronics Corp. Spec. No. : C543F5 Issued Date : 2004.02.27 Revised Date : Page No. : 3/10 PL2576-XXXF5 CYStek Product Specification Absolute Maximum Ratings (Note 1) Minimum ESD rating (C=100pF, R=1.5kΩ) Operating Ratings PL2576-3.3 Electrical Characteristics Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full operating temperature range Symbol Parameter Conditions Typ Min Max Units System Parameters (Note 3) Test Circuit Figure 2 VOUT Output V oltage V IN=12V , ILOAD=0.5A Circuit of Figure 2 3.3 3.234 3.336 V VOUT Output V oltage 6V≤VIN≤40V, 0.5A≤ILOAD≤3A Circuit of Figure 2 η Efficiency V IN=12V , ILOAD=3A 75 % PL2576-5.0 Electrical Characteristics Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full operating temperature range Symbol Parameter Conditions Typ Min Max Units System Parameters (Note 3) Test Circuit Figure 2 VOUT Output V oltage V IN=12V , ILOAD=0.5A Circuit of Figure 2 5.0 4.9 5.1 V VOUT Output V oltage 8V≤VIN≤40V, 0.5A≤ILOAD≤3A Circuit of Figure 2 η Efficiency V IN=12V , ILOAD=3A 77 %

CYStech Electronics Corp. Spec. No. : C543F5 Issued Date : 2004.02.27 Revised Date : Page No. : 4/10 PL2576-XXXF5 CYStek Product Specification Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full operating temperature range Symbol Parameter Conditions Typ Min Max Units System Parameters (Note 3) Test Circuit Figure 2 VOUT Output V oltage V IN=25V , ILOAD=0.5A Circuit of Figure 2 12 11.76 12.24 V VOUT Output V oltage 15V≤VIN≤40V, 0.5A≤ILOAD≤3A Circuit of Figure 2 12 11.52/ 11.40 12.48/ 12.60 V η Efficiency V IN=15V , ILOAD=3A 88 % Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full operating temperature range Symbol Parameter Conditions Typ Min Max Units System Parameters (Note 3) Test Circuit Figure 2 VOUT Output V oltage V IN=25V , ILOAD=0.5A Circuit of Figure 2 15 14.7 15.3 V VOUT Output V oltage 18V≤VIN≤40V, 0.5A≤ILOAD≤3A Circuit of Figure 2 η Efficiency V IN=18V , ILOAD=3A 88 % Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full operating temperature range Symbol Parameter Conditions Typ Min Max Units System Parameters (Note 3) Test Circuit Figure 2 VOUT Feedback V oltage VIN=12V , ILOAD=0.5A, VOUT=5V , Circuit of Figure 2 1.230 1.217 1.243 V VOUT Feedback V oltage 8V≤VIN≤40V, 0.5A≤ILOAD≤3A VOUT=5V , Circuit of Figure 2 η Efficiency VIN=12V , ILOAD=3A, VOUT=5V 77 %

CYStech Electronics Corp. Spec. No. : C543F5 Issued Date : 2004.02.27 Revised Date : Page No. : 5/10 PL2576-XXXF5 CYStek Product Specification All Output Voltage Versions Electrical Characteristics Specifications with standard type face are for TJ=25°C, and those with boldface type apply over full operating temperature range. Unless otherwise specified, VIN=12V for the 3.3V , 5.0V , and adjustable versions, VIN=25V for the 12V version, and VIN=30V for the 15V version. ILOAD=500mA. Symbol Parameter Conditions Typ Min Max Units Ib Feedback bias current VOUT=5V (adjustable version only) 50 - 100/ 500 nA fO Oscillator frequency (Note 8) 52 47/ 42 58/ 63 kHz VSAT Saturation voltage I OUT=3A (Note 4) 1.4 - 1.8/ 2.0 V DC Maximum duty cycle (ON) (Note 5) 98 93 - % IL Output leakage current (Notes 6, 7) Output = 0V Output = -1V 7.5 30 mA IQ Quiescent current (Note 6) 5 - 10 mA ISTBY Standby quiescent current ON/OFF pin=5V (OFF) 50 - 200 µA ON/OFF Control VIH V OUT=0V 1.4 2.2/ 2.4 - V VIL ON/OFF pin logic input level VOUT=Nominal output voltage 1.2 - 1.0/ 0.8 V IIH ON/OFF pin=5V (OFF) 12 - 30 µA IIL ON/OFF pin input current ON/OFF pin=0V (ON) 0 - 10 µA Note 1 : Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2 : All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). Note 3 : External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the PL2576 is used as shown in the figure 2 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. Note 4 : Output pin sourcing current. No diode, inductor or capacitor connected to output. Note 5 : Feedback pin removed from output and connected to 0V . Note 6 : Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V , and 5V versions, and +25V for the 12V and 15V versions, to force the output transistor OFF. Note 7 : VIN=40V . Note 8 : The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.

CYStech Electronics Corp. Spec. No. : C543F5 Issued Date : 2004.02.27 Revised Date : Page No. : 6/10 PL2576-XXXF5 CYStek Product Specification Typical Performance Characteristics (circuit of Figure 2) Normalized Output Voltage -0.8 -0.6 -0.4 -0.2 0.2 0.4 0.6 0.8 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) VIN = 20V,ILOAD = 500mA Normalized at TJ = 25℃ Line Regulation -0.6 -0.4 -0.2 0.2 0.4 0.6 0.8 1.2 1.4 0 1 02 03 04 05 0 Input Voltage(V) ILOAD = 500mA, TJ = 25℃ 3.3V, 5V & ADJ 12V & 15V Dropout Voltage 0.25 0.5 0.75 1.25 1.5 1.75 -75 -50 -25 0 25 50 75 100 125 150 Junction Temperature(℃) ILOAD=0.2A ILOAD=1A ILOAD=3A L1 = 150μH Rind = 0.1Ω Standby Quiescent Current 100 125 150 175 200 -50 -25 0 25 50 75 100 125 Junction Temperature(℃) VIN=40V VIN=12V VON/OFF = 5V Quiescent Current 0 1 02 03 04 05 0 Input Voltage (V) ILOAD=0.2A ILOAD=3A VOUT = 5V, measured at ground pin, TJ = 25℃ Current Limit 4.5 5.5 6.5 -75 -50 -25 0 25 50 75 100 125 150 Junction Temperature (℃) VIN=25V

CYStech Electronics Corp. Spec. No. : C543F5 Issued Date : 2004.02.27 Revised Date : Page No. : 7/10 PL2576-XXXF5 CYStek Product Specification Switch Saturation Voltage 0.2 0.4 0.6 0.8 1.2 1.4 1.6 00 . 511 . 522 . 53 Switch Current (A) 150℃ 25℃ -55℃ Efficiency 0 1 02 03 04 05 0 Input Voltage (V) ILOAD = 3A ILOAD = 0.2A ILOAD = 0.2A ILOAD = 3A 15V OUT TJ = 25℃ Oscillator Frequency -75 -50 -25 0 25 50 75 100 125 150 Junction Temperature (℃) Normalized at 25℃ VIN = 40V VIN = 12V Minimum Operating Voltage 0.5 1.5 2.5 3.5 4.5 -50 -25 0 25 50 75 100 125 Junction Temperature (℃) Adjustable version only VOUT ≒1.23V ILOAD = 0.5A Quiescent Current vs Duty Cycle 2.5 7.5 12.5 17.5 0 2 04 06 08 0 1 0 0 Duty Cycle (%) Adjustable version only VIN=7V VIN=40V ILOAD = 0.5A Feedback Voltage vs Duty Cycle -20 -15 -10 0 2 04 06 08 0 1 0 0 Duty Cycle (%) Adjustable version only ILOAD = 0.5A VIN=40V VIN=7V

CYStech Electronics Corp. Spec. No. : C543F5 Issued Date : 2004.02.27 Revised Date : Page No. : 8/10 PL2576-XXXF5 CYStek Product Specification Minimum Power Dissipation 0.5 1.5 2.5 3.5 4.5 0 1 02 03 04 05 06 07 08 09 0 1 0 0 Ambient Temperature (℃) θJA = 32℃/W θJA = 37℃/W θJA = 50℃/W θJA = 73℃/W Feedback Pin Current -100 -75 -50 -25 100 -75 -50 -25 0 25 50 75 100 125 150 Junction Temperature (℃) Adjustable version only Switching Waveforms 50V 5μs/ div Load Transient Response -100mV 100mV Load Current Output Voltage Change 100 μs / div VOUT=15V A : Output Pin Voltage, 50 V / div B : Output Pin Current, 2A / div C : Inductor Current, 2A / div D : Output Ripple Voltage, 50mV / div AC Coupled Horizontal Time Base : 5μs / div A B C D

CYStech Electronics Corp. Spec. No. : C543F5 Issued Date : 2004.02.27 Revised Date : Page No. : 9/10 PL2576-XXXF5 CYStek Product Specification Test Circuit and Layout Guidelines As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance generate voltage transients which can cause problems. For minimal inductance and ground loops, the length of the leads indicated by heavy lines should be kept as short as possible. Single-point grounding (as indicated) or ground plane construction should be used for best results. When using the Adjustable version, physically locate the programming resistors near the regulator, to keep the sensitive feedback wiring short. + Cin + Cout Vin Unregulated DC Input PL2576 GND 3 +Vin Feedback Output 5ON / OFF100μF MBR360 100μH 1000μF Fixed Output L O A D

1 Vout

Cin--100μF, 75V, Aluminum Electrolytic Cout--1000μF, 25V, Aluminum Electrolytic L1--100μH, Pulse Eng, PE92108 D1--Schottky, MBR360 R1--2k, 0.1% R2--6.12k, 0.1% + Cin + Cout 7V-40V Unregulated DC Input PL2576-ADJ GND 3 +Vin Feedback Output 5ON / OFF100μF MBR360 100μH 1000μF L O A D 5.00V Adjustable Output Voltage Version Fixed Output Voltage Versions Vout=VREF(1+ R2=R1( where VREF=1.23V, R1 between 1k and 5k Figure 2 R1 ) Vout VREF -1)

CYStech Electronics Corp. Spec. No. : C543F5 Issued Date : 2004.02.27 Revised Date : Page No. : 10/10 PL2576-XXXF5 CYStek Product Specification TO-263-5L Dimension *: Typical A1 0 0.006 0 0.150 e 0.067(typical) 1.700(typical) Notes: 1.Controlling dimension: inch 2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.If there is any question with packing specification or packing method, please contact your local CYStek sales office. Material:

  • Lead: 42 Alloy ; solder plating
  • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 Important Notice:
  • All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek.
  • CYStek reserves the right to make changes to its products without notice.
  • CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.
  • CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. Style: Pin 1.Vin 2.Vout 3.GND 4.Feedback 5.ON/OFF 5-Lead TO-263-5L Plastic Package CYStek Package Code: F5 Marking: 2576-XXX