Related Manuals for Texas Instruments TPS769 Series
Summary of Contents for Texas Instruments TPS769 Series
- Page 1 TPS769xx SOT-23 LDO Linear Regulator Evaluation Module User’s Guide February 2000 Mixed-Signal Products SLVU024...
- Page 2 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability.
- Page 3 Trademarks TI is a trademark of Texas Instruments Incorporated. Chapter Title—Attribute Reference...
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Page 5: Table Of Contents
Running Title—Attribute Reference Contents Introduction ..............Introduction . -
Page 7: Introduction
Chapter 1 Introduction TPS76901EVM–127, TPS76918EVM-127, TPS76933EVM-127 LDO regulator modules provide the user with cost-effec- tive solutions for providing power to various low-voltage options. These EVMs are pin-compatible with standard 3-terminal type regulators. The EVMs are set up as 1-V, 1.8-V, and 3.3-V output at 100 mA. Various options can be imple- mented with the board to give a range of output voltages from 0 to 5.5 V. -
Page 8: Introduction
Introduction 1.1 Introduction Low cost and simplicity of design make LDO regulators popular solutions in low-power step-down applications where lack of isolation from the input source is not a concern. Applications of the EVM include single DSP C5400 device, digital camera, medical test equipment, cell phones, consumer audio equipment, and battery backup electronics. -
Page 9: Output Voltages Greater Than Vref
Output Voltages Greater Than V 1.2 Output Voltages Greater Than V For applications requiring an output voltage greater than the internal reference voltage (V ) of 1.224 V, a standard linear regulator circuit with an external voltage divider is all that is necessary. The lower section of Figure 1 shows a generic linear regulator circuit with an input capacitor (C1), output capacitor (C3), external voltage divider (R3/R4), and the enable circuit with either a pullup resistor (R1) or pulldown resistor (R2) as required. -
Page 10: Output Voltages Less Than Vref
Output Voltages Less Than V 1.3 Output Voltages Less Than V Applications requiring a lower output voltage than the internal reference volt- age needs additional circuitry. The backside components shown in the upper section of figure 1 along with the deletion of R4 will implement this option. The backside components function as a second (but fixed) voltage source to artifi- cially increase the voltage at the feedback terminal, thus requiring less output voltage to satisfy the error amplifier. -
Page 11: Fixed Voltage Options
Fixed Voltage Options 1.4 Fixed Voltage Options The TPS76918EVM–127 (Vout = 1.8 V) and the TPS76933EVM–127 (Vout = 3.3 V) fixed voltage options are also available. Both of these EVMs use only 4 components (see Figure 1–2) and can be used as a three terminal regulator. Figure 1–2. - Page 12 Introduction...
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Page 13: Board Layers And Assembly Drawings
Chapter 2 Board Layers and Assembly Drawings This chapter shows the board layers and assembly drawings of the TPS769xx EVM. Topic Page Board Layers ..........2–2 Assembly Drawings . -
Page 14: Board Layers
Board Layers 2.1 Board Layers Figure 2–1. Top Layer Figure 2–2. Top Silk Screen Board Layers and Assembly Drawings... -
Page 15: Bottom Layer (Top View)
Board Layers Figure 2–3. Bottom Layer (Top View) Figure 2–4. Bottom Silk Screen (Top View) Board Layers and Assembly Drawings... -
Page 16: Drill Drawing And Drill Table
Board Layers Figure 2–5. Drill Drawing and Drill Table Board Layers and Assembly Drawings... -
Page 17: Assembly Drawings
Assembly Drawings 2.2 Assembly Drawings Figure 2–6. Top Assembly Figure 2–7. Bottom Assembly (Bottom View) Board Layers and Assembly Drawings... - Page 18 Board Layers and Assembly Drawings...
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Page 19: Testing
Chapter 3 Testing This chapter provides details on testing the TPS76901–EVM–127 Topic Page Testing ............Testing... -
Page 20: Testing
Testing 3.1 Testing Power Supply 5-V, 150-mA Supply Load – 0 – 100 mA 3.2 Test Setup Test Procedure (for TPS76901EVM-127, V = 1 V) 1) Connect test setup as shown in the previous illustration. Set load to zero current. Set input voltage to 5 V and apply. 2) Verify output voltage is 1.00 V 50 mV. -
Page 21: Load Regulation
Test Setup Table 3–1. Bill Of Materials REF DES PART NUMBER DESCRIPTION SIZE Capacitor, ceramic, 1 µF, 16 V, ECJ-2VF1C105Z Panasonic +80%–20%, Y5V Not used Capacitor, tantalum, 4.7 µF, 35 V, 20% TPSC475K035R0600 Capacitor, tantalum, 22 µF, 10 V, 20% C3 (Alt) ECST1AC226R Panasonic... -
Page 22: Quiescent Current Vs Output Current
Test Setup Figure 3–2. Quiescent Current vs Output Current QUIESCIENT CURRENT OUTPUT CURRENT V ADJ = 1 V V IN = 5 V I O – Output Current – mA Figure 3–3. Line Regulation LINE REGULATION 1.05 1.045 1.04 I I =15 mA 1.035 I I =99.4 mA 1.03... -
Page 23: Quiescent Current Vs Output Current
Test Setup Operation of the 1-V EVM with input voltages from 2.7 V to 3 V requires in- creasing the bias current for the TL431. Changing R5 to 180 Ω accomplishes this at the expense of higher quiescent currents. Figures 3–4 and 3–5 show the results of this modification. - Page 24 Testing...
- Page 25 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments TPS76918EVM-127 TPS76901EVM-127 TPS76933EVM-127...
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