PT6940 Series 6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator SLTS155B Revised (4/8/2002) Features • Remote Sensing (Vo1 & Vo2) • Soft-Start • Short-Circuit Protection (coordinated shutdown) • 27-pin Space-Saving Package • Solderable Copper Case • High Efficiency Dual Output (See Ordering Information) • • • • • • Ideal Power Source for DSPs 5V/3.3V Input 6A Rated (Both Outputs) Internal Power-up Sequencing Single On/Off Control Independent Adjust/Trim Pin-Out Information Ordering Information Description PT6941o = +3.3/2.5 Volts PT6942o = +3.3/1.8 Volts PT6943o = +3.3/1.5 Volts PT6944o = +3.3/1.2 Volts † PT6946o = +2.5/1.8 Volts † PT6947o = +2.5/1.5 Volts † PT6948o = +2.5/1.2 Volts The PT6940 Excalibur™ power modules are a series of high-efficiency dual-output regulators, housed in a solderable spacesaving package. The dual output is ideal for DSP applications that require a second voltage source for a processor core. Both outputs from the PT6940 regulator modules are rated to deliver a full 6A load current simultaneously, and are internally sequenced to comply with the power-up requirements of popular DSP ICs. Each output can be independently adjusted with a single external resistor, and incorporates an output sense to compensate for voltage drop between the regulator and load. A short-circuit load fault at either output will result in the coordinated shutdown of both voltages. † -Denotes models that will also operate off 3.3V input bus. PT Series Suffix (PT1234x) Case/Pin Configuration Vertical Horizontal SMD Order Suffix Package Code N A C (ENE) (ENF) (ENG) (Reference the applicable package code drawing for the dimensions and PC layout) Pin Function Pin Function 1 STBY* † 15 Vin 2 Vo1 Adjust 16 Vin 3 Vo1 Sense 17 GND 4 Vo1 18 GND 5 Vo1 19 GND 6 Vo1 20 GND 7 GND 21 GND 8 GND 22 GND 9 GND 23 Vo2 10 GND 24 Vo2 11 GND 25 Vo2 12 GND 26 Vo2 Sense 13 Vin 27 Vo2 Adjust 14 Vin † STBY* pin: Open = Outputs enabled Ground = Outputs disabled Standard Application Vo1 Sense STBY* Vo2 Sense 1 VIN 13–16 3 330µF + 4–6 Vo1 23–25 Vo2 PT6940 7–12 CIN 26 17–22 Co1 330µF + Co 2 + L O A D 330µF L O A D Cin = Req’d 330µF * electrolytic GND GND Co1/Co2 = Req’d 330µF * electrolytic *300µF for Oscon® or low ESR tantalum (see application notes) For technical support and more information, see inside back cover or visit www.ti.com PT6940 Series 6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator General Specifications (Unless otherwise stated, Ta =25°C, Vin =5V, Cin =330µF, Co1 =330µF, Co 2 =330µF, and Io1/Io2 =Iomax) Characteristic Symbol Output Current Io Input Voltage Range Vin Set Point Voltage Tolerance Temperature Variation Line Regulation Load Regulation Total Output Voltage Variation Vo tol Regtemp Regline Regload ∆Votot Efficiency Vo Ripple (pk-pk) Transient Response Short Circuit Threshold Switching Frequency STBY* (Pin 1) Input High Voltage Input Low Voltage Input Low Current Quiescent Current External Output Capacitance Operating Temperature Range Storage Temperature Mechanical Shock η Vr ttr ∆Vtr Isc(pk) ƒo VIH V IL IIL Iin standby Ta Ts Mechanical Vibration Weight Flammability (1) — — Conditions Ta =25°C, natural convection Ta =60°C, 200LFM airflow Over Io Range –40° ≤Ta ≤ +85°C, Io =Iomin Over Vin range Over Io range Includes set-point, line, load, –40° ≤Ta ≤ +85°C Vin =5V, Io1 = Io2 =4A Min Vo1 ≤2.5V Vo1 >2.5V Vo =3.3V Vo =2.5V Vo =1.8V Vo =1.5V Vo =1.2V PT6941 PT6942 PT6943 PT6944 PT6946 PT6947 PT6948 20MHz bandwidth 1A/µs load step, 50% to 100% Iomax Vo over/undershoot Reset followed by auto-recovery Over Vin range Referenced to GND (pin 7) pin 1 to GND Both outputs Over Vin Range — Per Mil-STD-883D, Method 2002.3 1 msec, ½ Sine, mounted Mil-STD-883D Method 2007.2, Vertical 20-2000 Hz Horizontal Vertical/Horizontal Meets UL 94V-O PT6940 Series Typ Max Units 0.1 (2) 0.1 (2) 3.1 4.5 — — — — — — — — — — — — — — — — — — — — 300 — — — — ±0.5 ±0.5 ±5 ±5 ±43 ±35 ±28 ±25 ±22 92 91 90 90 89 88 87 35 60 ±70 13 (3) 350 6 6 5.5 5.5 ±2 — ±10 ±10 ±100 ±75 ±54 ±45 ±36 — — — — — — — — — — — 400 mVpp µs mV A kHz — –0.1 — — 330 –40 (5) — — -0.5 10 — — Open (4) +0.4 – 20 TBD +85 (6) mA mA µF °C –40 — +125 °C — — — — TBD TBD (7) TBD (7) 34 — — — — G’s A V %Vo %Vo mV mV mV % V G’s grams The outputs, Vo1 and Vo2, have similar characteristics. The applicable performance parameters are defined according to output voltage. The minimum output current applies to each output. The module will operate at no load with reduced specifications. A short-circuit load fault at either output causes the module to continuously reset, affecting both outputs. The STBY* control (pin 1) has an internal pull-up, and if it is left open circuit the module will operate when input power is applied. The open-circuit voltage is approximately the input voltage, Vin . Refer to the application notes for interface considerations. (5) For operating temperatures below 0°C, Cin, Co1, and Co2 must have stable characteristics. Use either tantalum or Oscon® capacitors. (6) See Safe Operating Area curves for the specific output voltage combination, or contact the factory for the appropriate derating. (7) Only the case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing. Input/Output Capacitors: The PT6940 series requires a 330µF electrolytic capacitor at the input and both outputs for proper operation (300µF for Oscon® or low ESR tantalum). In addition, the input capacitance must be rated for a minimum of 1.0Arms ripple current. For transient or dynamic load applications, additional capacitance may be required. Refer to the application notes for more information. Notes: (1) (2) (3) (4) For technical support and more information, see inside back cover or visit www.ti.com PT6940 Series 6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator Performance Characteristics; Vin =5V (See Note A) Performance Characteristics; Vin =3.3V Efficiency vs. Io1 & Io2 Load Currents Efficiency vs. Io 1 & Io 2 Load Currents 100 100 95 95 90 PT6941 PT6942 PT6943 PT6944 PT6946 PT6947 PT6948 85 80 75 70 Efficiency - % Efficiency - % 90 85 PT6946 PT6947 PT6948 80 75 70 65 65 60 60 0 1 2 3 4 5 0 6 1 2 35 35 30 30 PT6946 PT6947 PT6948 PT6941 PT6942 PT6943 PT6944 5 6 20 15 10 25 Vo1 Ripple - mV 25 Vo1 Ripple - mV 4 Vo1 Ripple vs. Io 1 & Io2 Load Currents Vo1 Ripple vs. Io 1 & Io 2 Load Currents 20 PT6946 PT6947 PT6948 15 10 5 5 0 0 0 1 2 3 4 5 0 6 1 2 Iout (A) [Both Outputs] 3 4 5 6 Iout (A) [Both Outputs] Vo2 Ripple vs. Io 1 & Io 2 Load Currents Vo2 Ripple vs. Io 1 & Io2 Load Currents 35 35 30 30 25 25 PT6941 PT6946 PT6942 PT6947 PT6948 PT6943 PT5944 20 15 10 Vo2 Ripple - mV Vo2 Ripple - mV 3 Iout (A) [Both Outputs ] Iout (A) [Both Outputs] 20 PT6946 PT6947 PT6948 15 10 5 5 0 0 0 1 2 3 4 5 6 0 1 2 Iout (A) [Both Outputs] 3 4 5 6 Iout (A) [Both Outputs] Power Dissipation Vs. Io1 & Io2 Load Currents Power Dissipation vs. Io1 & Io2 Load Currents 5 5 4 4 Pd - Watts Pd - Watts (See Note A) 3 2 1 3 2 1 0 0 0 1 2 3 4 5 6 Iout (A) [Both Outputs] 0 1 2 Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter. For technical support and more information, see inside back cover or visit www.ti.com 3 4 Iout (A) [Both Outputs] 5 6 PT6940 Series 6-A Dual Output 5-V/3.3-V Input Integrated Switching Regulator Safe Operating Area Curves; Vin =5V (See Note B) Safe Operating Area Curves; Vin =3.3V/5V PT6946 (2.5V/1.8V) 90 90 80 80 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 Ambient Temperature (°C) Ambient Temperature (°C) PT6941 (3.3V/2.5V) 30 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 20 20 0 1 2 3 4 5 6 0 1 Iout (A) [Both Outputs] 3 4 5 6 PT6947 (2.5V/1.5V) PT6942 (3.3V/1.8V) 90 80 80 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 Ambient Temperature (°C) Ambient Temperature (°C) 2 Iout (A) [Both outputs] 90 30 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 20 20 0 1 2 3 4 5 6 0 1 Iout (A) [Both Outputs] 2 3 4 5 6 Iout (A) [Both Outputs] PT6948 (2.5V/1.2V) PT6943 (3.3V/1.5V) 90 90 80 80 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 Ambient Temperature (°C) Ambient Temperature (°C) (See Note B) Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 20 20 0 1 2 3 4 5 6 0 Iout (A) [Both Outputs] 1 2 3 4 5 6 Iout (A) [Both Outputs] PT6944 (3.3V/1.2V) 90 Ambient Temperature (°C) 80 Airflow 70 200LFM 120LFM 60LFM Nat conv 60 50 40 30 20 0 1 2 3 4 5 6 Iout (A) [Both Outputs] Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT6940 Series Operating Features of the PT6940 Series of Dual-Output Voltage Regulators Over-Current Protection The PT6940 series of regulators incorporate independent current limit protection at both outputs (Vo1 & Vo2) with a periodic shutdown of both outputs. Applying a load current, in excess of the current limit threshold to either output, results in the shutdown of both voltages after a short period; typically 15ms. Following shutdown the module periodically attempts to recover by executing a soft start power-up at intervals of approximately 100ms. If the overcurrent fault persists, each attempted restart will result in a corresponding over-current trip and shutdown. During the 15ms period prior to each successive shutdown, the output with the load fault may not reach full regulation. Standby Control The output voltages from the PT6940 may be disabled using the regulator’s Standby control. The standby function is provided by the “STBY*” control (pin 1). If pin 1 is left open-circuit the regulator operates normally, and provides a regulated output at both Vo1 (pins 4–6) and Vo2 (pins 23– 25) whenever a valid input source voltage is applied to Vin (pins 13–16) with respect to GND (pins 7-12 & 17–22). Applying a low-impedance sink to ground1 at pin 1, simultaneously disables both regulated outputs. This places the regulator in standby mode, and reduces the input current drawn by the ISR to typically 10mA. The Standby control may also be used to maintain both regulator outputs at zero volts during the period that input power is applied. Power-Up Voltage Sequencing The output voltages from the PT6940 series regulators are independently regulated, and internally sequenced to meet the power-up requirements of popular microprocessors and DSP chipsets. Figure 1 shows the output voltage waveforms of a PT6942 (3.3V/1.8V) after either input power is applied, or the regulator is enabled. In this example turning Q1 off in Figure 2, removes the low-voltage signal at pin 1 and enables the regulator. Following a delay of about 3–5ms, Vo1 and Vo2 rise together until the lower voltage, Vo2, reaches its regulation voltage. Vo1 then continues to rise until both outputs reach full regulation. The total powerup time is less than 15ms, and is relatively independent of load, temperature, and output capacitance. The turn-off of Q1 corresponds to the rise in VSTBY. The waveforms were measured with a 5V input voltage, and with resistive loads of 4A at both the Vo1 and Vo2 outputs. The standby pin is ideally controlled using an open-collector (or open-drain) discrete transistor (See Figure 2). The open-circuit voltage is the input voltage, Vin. Figure 1 V1 (1V/Div) V2 (1V/Div) Vstby (5V/Div) Figure 2 3 26 V1 Sns V2 Sns Vo1 V in 13–16 PT6940 Vin Vo 1 23–25 Vo 2 V2 Adj V1 Adj STBY* 1 Vo2 4–6 7–12 17–22 27 2 + CIN + Q1 BSS138 Co1 + Co2 Inhibit COM COM Notes: 1. The standby control input is Not compatible with TTL or other devices that incorporate a totem-pole output drive. Use only a true open-collector device, preferably a discrete bipolar transistor (or MOSFET). To ensure the regulator output is disabled, the control pin must be pulled to less than 0.4Vdc with a low-level 0.5mA sink to ground. 2 Do not use an an external pull-up resistor. The control pin has its own internal pull-up. Adding an external pull-up could disable the over-current protection. The open-circuit voltage of the “STBY*” pin is the input voltage, Vin. HORIZ SCALE (2ms/Div) For technical support and more information, see inside back cover or visit www.ti.com Notes PT6940 Series Capacitor Recommendations for the Dual-Output PT6940 Regulator Series Input Capacitor: The recommended input capacitance is determined by 1.0 ampere minimum ripple current rating and 330µF minimum capacitance (300µF for Oscon® or low ESR tantalum). Ripple current and <100mΩ equivalent series resistance (ESR) values are the major considerations, along with temperature, when designing with different types of capacitors. Tantalum capacitors have a recommended minimum voltage rating of twice the maximum DC voltage + AC ripple. This is necessary to insure reliability for input voltage bus applications Output Capacitors: Co1/Co2 The ESR of the required capacitors, Co1 & Co2 must not be greater than 150mΩ. Electrolytic capacitors have poor ripple performance at frequencies greater than 400kHz but excellent low frequency transient response. Above the ripple frequency, ceramic capacitors are necessary to improve the transient response and reduce any high frequency noise components apparent during higher current excursions. Preferred low ESR type capacitor part numbers are identified in Table 1. Tantalum Capacitors Tantalum type capacitors can be used for the output but only the AVX TPS series, Sprague 593D/594/595 series or Kemet T495/T510 series. These capacitors are recommended over many other tantalum types due to their higher rated surge, power dissipation, and ripple current capability. As a caution the TAJ series by AVX is not recommended. This series has considerably higher ESR, reduced power dissipation, and lower ripple current capability. The TAJ series is less reliable than the AVX TPS series when determining power dissipation capability. Tantalum or Oscon® types are recommended for applications where ambient temperatures fall below 0°C. Capacitor Table Table 1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple current (rms) ratings. The number of capacitors required at both the input and output buses is identified for each capacitor type. This is not an extensive capacitor list. Capacitors from other vendors are available with comparable specifications. Those listed are for guidance. The RMS ripple current rating and ESR (Equivalent Series Resistance at 100kHz) are critical parameters necessary to insure both optimum regulator performance and long capacitor life. Table 1: Input/Output Capacitors Capacitor Vendor/ Component Series Capacitor Characteristics Quantity Working Voltage Value(µF) (ESR) Equivalent Series Resistance 85°C Maximum Ripple Current(Irms) Physical Size(mm) Input Bus Output Bus Panasonic FC 25V 35V 35V 560µF 390µF 330µF 0.0065Ω 0.065Ω 0.117Ω 1205mA 1205mA 555mA 12.5x15 12.5x15 8x11.5 1 2 N/R 1 1 1 EEUFC1E561S EEUFC1V391S EEUFC1C331 United Chemi-Con LXV/FS/ LXZ 16V 35V 10V 20V 330µF 470µF 330µF 150µF 0.120Ω 0.052Ω 0.025Ω 0.030÷2 Ω 555mA 1220mA 3500mA 3200mA 8x12 10x20 10x10.5 10x10.5 N/R 1 1 2 1 1 1 2 LXZ16VB331M8X12LL LXZ35VB471M10X20LL 10FS330M 20FS150M Nichicon PL/ PM 35V 35V 50V 560µF 330µF 470µF 0.048Ω 0.065÷2 Ω 0.046Ω 1360mA 1020mA 1470mA 16x15 12.5x15 18x15 1 1 1 1 1 1 UPL1V561MHH6 UPL1V331MHH6 UPM1H4711MHH6 Panasonic FC (Surface Mtg) 10V 35V 16V 1000µF 330µF 330µF 0.043Ω 0.065Ω 0.150Ω 1205mA 1205mA 670mA 12x16.5 12.5x16 10x10.2 1 1 N/R 1 1 1 EEVFC1A102LQ EEVFC1V331LQ EEVFC1C331P Oscon- SS SV 10V 10V 20V 330µF 330µF 150µF 0.025Ω 0.025Ω 0.024÷2 Ω >3500mA >3800mA 3600mA 10.0x10.5 10.3x10.3 10.3x10.3 1 1 2 1 1 2 10SS330M 10SV300M 20SV150M SV= Surface Mount AVX Tantalum TPS 10V 10V 10V 330µF 330µF 220µF 0.100÷2 Ω 0.100÷2 Ω 0.095Ω >2500mA >3000mA >2000mA 7.3Lx 4.3Wx 4.1H 2 2 2 1 1 2 TPSV337M010R0100 TPSV337M010R0060 TPSV227M0105R0100 10V 10V 330µF 220µF 0.033Ω 0.07Ω÷2 =0.035Ω 1400mA >2000mA 7.3Lx5.7W x 4.0H 2 2 1 2 T510X337M010AS T495X227M010AS 10V 10V 330µF 220µF 0.045Ω 0.065Ω 2350mA >2000mA 7.3Lx 6.0Wx 4.1H 2 2 1 2 4D337X0010R2T 594D227X0010D2T Kemet T510/ T495 Sprague 594D Vendor Number N/R –Not recommended. The voltage rating does not meet the minimum operating limits. For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT6940 Series Adjusting the Output Voltages of the PT6940 Dual-Output ISRs Each output voltage from the PT6940 series of integrated switching regulators (ISRs) can be independently adjusted higher or lower than the factory trimmed pre-set voltage. The voltages, Vo1 and Vo2 may each be adjusted either up or down using a single external resistor 1. Table 1 gives the adjustment range for both Vo1 and Vo2 for each model in the series as Va(min) and Va(max). Note that Vo2 must always be lower than Vo1 2. Where: Vo = Original output voltage, (Vo1 or Vo2) Va = Adjusted output voltage Rs = The series resistance from Table 1 Notes: 1. Use only a single 1% resistor in either the (R1) or R2 location to adjust Vo1, and in the (R3) or R4 location to adjust Vo2. Place the resistor as close to the module as possible. Vo1 Adjust Up: To increase the output, add a resistor R2 between pin 2 (Vo1 Adjust) and pins 7-12 (GND) 3. 2. Vo2 must always be at least 0.3V lower than Vo1. 3. When adjusting Vo1 higher than the factory pre-set output voltage the minimum input voltage must be revised as follows. Vo1 Adjust Down: Add a resistor (R1), between pin 2 (Vo1 Adjust) and pin 3 (Vo1 Sense). Vo2 Adjust Up: Add a resistor R4 between pin 27 (Vo2 Adjust) and pins 17–22 (GND). Vo1 =3.3V: Vin(min) = (Vo1 + 1)V or 4.5V, whichever is greater. Vo2 Adjust Down: Add a resistor (R3) between pin 27 (Vo2 Adjust) and pin 26 (Vo2 Sense). Vo1 =2.5V: Vo1 =2.5V is the maximum output voltage allowed for operation off a 3.3V input bus. If Vo1 is adjusted above 2.5V, the input voltage must be a minimum of 4.5V. Refer to Figure 1 and Table 2 for both the placement and value of the required resistor. 4. Vo1 and Vo2 may be adjusted down to an alternative bus voltage by making, (R1) or (R3) respectively, a zero ohm link. Refer to the Table 1 footnotes for guidance. The adjust up and adjust down resistor values can also be calculated using the following formulas. Be sure to select the correct formula parameter from Table 1 for the output and model being adjusted. (R1) or (R3) = R2 or R4 = 10 (Va – 0.9 ) Vo – Va 9 Va – Vo – Rs kΩ – Rs kΩ 5. Never connect capacitors to either the Vo1 Adjust or Vo2 Adjust pins. Any capacitance added to these control pins will affect the stability of the respective regulated output. Figure 1 Vo 1 Sense Vo 2 Sense 3 26 V 1 Sns V 2 Sns Vo 1 V IN 13–16 Vo 1 4–6 PT6940 Vin Vo 2 Vo 2 23–25 V2 Adj V1 Adj 7–12 17–22 27 2 (R1) (R3) + + + CIN Co 1 R2 GND For technical support and more information, see inside back cover or visit www.ti.com Co 2 L O A D R4 GND L O A D Application Notes PT6940 Series Table 1 ADJUSTMENT RANGE AND FORMULA PARAMETERS Vo1 Bus Series Pt # Adj. Resistor Vo(nom) Va(min) Va(max) Ω) Rs (kΩ Ref. Note 4: PT6941/42/43/44 (R1)/R2 PT6946/47/48 (R1)/R2 3.3V 2.5V * 3.5V 20.0 2.5V 1.8V * 2.5V 13.0 PT6941/42/43/44 (R1)/R2 PT6946/47/48 (R1)/R2 3.3V 2.5V Vo2 Bus (2) PT6941 (R3)/R4 PT6942/46 (R3)/R4 PT6943/47 (R3)/R4 PT6944/48 (R3)/R4 2.5V 1.8V * 3.1V 13.0 1.8V 1.5V * 2.2V 20.0 1.5V 1.2V * 2.4V 10.0 1.2V 1.15V 1.5V † 29.4 Vo2 Bus Series Pt # Adj. Resistor PT6941 (R3)/R4 PT6942/46 (R3)/R4 PT6943/47 (R3)/R4 PT6944/48 (R3)/R4 2.5V 1.8V 1.5V 1.2V * (R1) = Zero-ohm link †(R3) = Zero-ohm link Table 2 ADJUSTMENT RESISTOR VALUES Vo1 Bus Series Pt # Adj. Resistor Vo(nom) Va(req’d) 1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 (0.0) (1.6)kΩ (3.7)kΩ (6.1)kΩ (9.0)kΩ (12.6)kΩ (17.0)kΩ (22.7)kΩ (30.3)kΩ (41.0)kΩ (57.0)kΩ (83.7)kΩ (137.0)kΩ (297.0)kΩ (0.0)kΩ (2.0)kΩ (4.3)kΩ (6.9)kΩ (10.0)kΩ (13.6)kΩ (18.0)kΩ (23.3)kΩ (30.0)kΩ (38.6)kΩ (50.0)kΩ (90.0)kΩ (210.0)kΩ 70.0kΩ 25.0kΩ 10.0kΩ 2.5kΩ 167.0kΩ 77.0kΩ 47.0kΩ 32.0kΩ 23.0kΩ # # # # # Vo(nom) Va(req’d) 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.1 (20.6)kΩ (0.0)kΩ (4.0)kΩ (10.0)kΩ (20.0)kΩ (40.0)kΩ (100.0)kΩ (0.0)kΩ (6.0)kΩ (15.0)kΩ (30.0)kΩ (60.0)kΩ (150.0)kΩ (0.0)kΩ (1.6)kΩ (3.7)kΩ (6.1)kΩ (9.0)kΩ (12.6)kΩ (17.0)kΩ (22.7)kΩ (30.3)kΩ (41.0)kΩ (57.0)kΩ (83.7)kΩ (137.0)kΩ (297.0)kΩ 160.0kΩ 70.0kΩ 40.0kΩ 25.0kΩ 16.0kΩ 10.0kΩ 5.7kΩ 2.5kΩ 151.0kΩ 60.6kΩ 30.6kΩ 15.6kΩ 6.6kΩ 0.0kΩ 170.0kΩ 80.0kΩ 50.0kΩ 35.0kΩ 26.0kΩ 19.6kΩ 15.7kΩ 12.5kΩ 10.0kΩ 8.0kΩ 6.4kΩ 5.0kΩ 3.9kΩ 2.9kΩ 2.0kΩ 1.3kΩ 0.6kΩ 0.0kΩ 167.0kΩ 77.0kΩ 47.0kΩ 32.0kΩ 23.0kΩ 17.0kΩ 12.7kΩ 9.5kΩ 7.0kΩ 5.0kΩ 2.0kΩ R1/R3 = (Blue), R2/R4 = Black # See Note 3 For technical support and more information, see inside back cover or visit www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. 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