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| PT6900 Series 12 Watt 5V/3.3V Input Plus to Minus Voltage Converter SLTS041A (Revised 6/30/2000) * * * * * +5V/+3.3V Input Voltage Negative Output Remote Sense Adjustable Output Voltage 23-pin SIP Package The PT6900 is a series of highperformance ISRs, that provide plus to minus voltage conversion, up to 12 watt in a 23-pin SIP package. The PT6900 is designed to supply regulated negative voltages for powering the latest ECL (-5.2V) and GaAs (-2.0V) ICs used in high-speed fiber optic communications. A 330F electrolytic capacitor is required on the input and output for proper operation. Please note that this product is not short-circuit protected. Pin-Out Information Pin Function 1 Do not connect Ordering Information Pin 13 14 15 16 17 18 19 20 21 22 23 Function GND GND GND Vout Vout Vout Vout Vout Vout Remote Sense Vout Do not connect +5V Input +3.3V Input Vout Standard Application V ADJ Remote Sense 2 3-7 22 16-21 2 3 4 5 -V OUT + Cout Vout Adjust Vin Vin Vin Vin Vin Remote Sense GND J K PT6901J PT6904K = -2.0V PT6902J PT6905K = -5.2V J K PT6903K = -1.5V K +VIN + Cin PT6900 9-15 8 6 7 8 9 10 11 12 PT Series Suffix (PT1234X) N A C (For dimensions and PC board layout, see Package Styles 1100 and 1110.) Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount GND Remote Sense GND GND GND GND GND C in = Required 330F electrolytic C out = Required 330F electrolytic Specifications Characteristics (Ta= 25C unless noted) Output Current PT6900 SERIES Symbols Io Conditions Ta = +25C, natural convection Vin =5.0V Vo = -2.0V / -1.5V Vo = -5.2V Vin =3.3V Vo = -2.0V Vo = -5.2V 0.1A Io I max Vo Vo PT6901 PT6902/PT6903 PT6904/PT6905 Vo = -2.0V Vo = -5.2V Vo = -1.5V Min 0.1 (1) 0.1 (1) 0.1 (1) 0.1 (1) 4.5 3.1 Vo - 0.05 -1.4 -2.7 -1.2 -- -- -- -- -- -- -- -- -- -- -- 500 0 -40 Vertical/Horizontal -- Vo = -1.5V / -2.0V Vo = -5.2V and I max Vo = -1.5V Vo = -2.0V Vo = -5.2V Vo = -2.0V Vo = -5.2V Typ -- -- -- -- -- -- -- -- -- -- 0.5 0.5 40 50 200 200 65 70 77 67 75 -- -- -- 28/33 Max 6.0 3.5 5.0 2.5 5.5 3.6 Vo + 0.05 -4.4 -6.5 -3.4 1.0 1.0 -- -- -- -- -- -- -- -- -- 600 +85 (2) +125 -- (2) (2) (2) (2) Units A A V V V % % mV Sec mV % % kHz C C grams Input Voltage Range Output Voltage T olerance Output Adjust Range Nominal Vin, Io = I max 0C Ta +60C Pin 14 to Vo or GND Line Regulation Load Regulation Vo Ripple/Noise Transient Response with Cout = 330F Efficiency Regline Regload Vn ttr Vos Over Vin range, I o =I max Vin =V nom, 0.1 Io Imax Vin = V nom, Io =I max Io step between 0.5xImax Vo over/undershoot Vin =+5V, Io =0.5xImax Vin = +3.3V, Io =0.5xImax Switching Frequency Absolute Maximum Operating T emperature Range Storage T emperature Weight o Ta Ts -- Over Vin and Io ranges Over Vin Range Notes: (1) ISR-will operate down to no load with reduced specifications. (2) See SOA curves or contact the factory for the approrpiate derating. For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT6900 Series 12 Watt 5V/3.3V Input Plus to Minus Voltage Converter Typical Characteristics 5.0V Input Voltage Efficiency vs Output Current 90 (See Note A) 90 3.3V Input Voltage Efficiency vs Output Current (See Note A) 80 80 Efficiency - % 70 60 PT6902 PT6901 PT6903 Efficiency - % 70 PT6905 PT6904 60 50 40 0 1 2 3 4 5 6 50 0 1 2 3 4 5 Iout (A) Iout (A) Power Dissipation vs Output Current 8 8 Power Dissipation vs Output Current 6 6 Pd - Watts 4 PT6902 PT6901 PT6903 Pd - Watts 4 PT6905 PT6904 2 2 0 0 1 2 3 4 5 6 0 0 1 2 3 4 5 Iout (A) Iout (A) Ripple vs Output Current 50 40 Ripple vs Output Current 40 30 Ripple - mV 30 20 PT6902 PT6901 PT6903 Ripple - mV 20 PT6905 PT6904 10 10 0 0 1 2 3 4 5 6 0 0 1 2 3 4 5 Iout (A) Iout (A) Safe Operating Area, PT6901 (Vin =5.0V) 90 80 (See Note B) Safe Operating Area, PT6902 (Vin =5.0V) 90 80 (See Note B) Ambient Temperature ( C) Ambient Temperature ( C) 70 Airflow 200LFM 120LFM 60LFM N at co nv 70 60 50 40 30 20 Airflow 200LFM 120LFM 60LFM Nat conv 60 50 40 30 20 0 1 2 3 4 5 6 0 0.5 1 1.5 2 2.5 3 3.5 4 Iout (A) Iout (A) Note A: All data listed in the above graphs has been developed from actual products tested at 25C. This data is considered typical data for the DC-DC Converter. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer's maximum operating temperatures For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes PT6900/6910 Series Adjusting the Output Voltage of the PT6900/PT6910 Positive to Negative Converter Series The negative output voltage of the Power Trends PT6900 Series ISRs may be adjusted higher or lower than the factory trimmed pre-set voltage with the addition of a single external resistor. T able 1 gives the allowable adjustment range for each model in the series as Va (min) and Va (max). Adjust Up: An increase in the output voltage is obtained by adding a resistor R2, between pin 2 (Vo adjust) and pin 8 (Remote Sense GND). Adjust Down: Add a resistor (R1), between pin 2 (Vo adjust) and pin 22 (Remote Sense Vo). Refer to Figure 1 and T able 2 for both the placement and value of the required resistor, either (R1) or R2 as appropriate. Notes: 1. Only a single 1% resistor is required in either the (R1) or R2 location. Do not use (R1) and R2 simultaneously. Place the resistor as close to the ISR as possible. 2. Never connect capacitors from Vo adjust to either GND, Vout, or the Sense pins. Any capacitance added to the Vo adjust pin will affect the stability of the ISR. 3. If the sense pins are not being used, the resistors (R1) and R2 can be connected to Vout and GND respectively. 4. An increase in the output voltage must be accompanied by a corresponding reduction in the maximum output current. The revised maximum output current must be reduced to the equivalent of 12Watts. i.e. Iout (max) = 12 Va Adc, Figure 1 22 Vo(sense) 3-7 16 - 21 +Vin +Vin PT6900 GND Vo(adj) 2 -Vo Vout(-) GND(sense) 8 9 - 15 (R1) (Down) C out + R2 (Up) COM The respective values of (R1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. (R1) = 24.9 (Va - Vr) - Rs k (Vo - Va) 24.9 Vr - Rs (Va - Vo) k R2 = Where: Vo Va Vr Rs = Original output voltage = Adjusted output voltage = Reference voltage in T able 1 = The resistance given in T able 1 where Va is the adjusted output voltage. Table1 PT6900/PT6910 ADJUSTMENT RANGE AND FORMULA PARAMETERS Series Pt # 5.0V Bus 3.3V Bus Vo (nom) Va (min) Va (max) Vr Rs (k) PT6903/13 -1.5V -1.2V -3.4V -1.0V 12.7 PT6901/11 PT6904/14 -2.0V -1.4V -4.5V -1.0V 10.0 PT6902/12 PT6905/15 -5.2V -2.7V -6.5V -0.92V 17.4 For technical support and more information, see inside back cover or visit www.ti.com/powertrends + C in L O A D COM Application Notes continued PT6900/6910 Series Table 2 PT6900/PT6910 ADJUSTMENT RESISTOR VALUES Series Pt # 5.0V Bus 3.3V Bus Vo (nom) Va (req'd) -1.2 -1.3 -1.4 -1.5 -1.6 -1.7 -1.8 -1.9 -2.0 -2.1 -2.2 -2.3 -2.4 -2.5 -2.6 -2.7 -2.8 -2.9 -3.0 -3.1 -3.2 -3.3 -3.4 -3.5 -3.6 -3.7 -3.8 R1 = (Blue) R2 = Black 236.0k 112.0k 70.3k 49.6k 37.1k 28.8k 22.9k 18.4k 15.0k 12.2k 9.9k 8.1k 6.5k 5.1k 3.9k 2.9k 2.0k 1.1k 0.4k 239.0k 115.0k 73.0k 52.3k 39.8k 31.5k 25.6k 21.1k 17.7k 14.9k 12.6k 10.8k 9.2k 7.8k 6.6k 5.6k 4.7k 3.8k (0.3)k (2.1)k (4.0)k (6.1)k (8.5)k (11.0)k (13.8)k (16.9)k (20.4)k (24.3)k (28.7)k (33.8)k PT6903/13 -1.5Vdc (3.9)k (24.7)k (86.9)k (6.6)k (14.9)k (27.4)k (48.1)k (89.6)k (214.0)k PT6901/11 PT6904/14 -2.0Vdc PT6902/12 PT6905/15 -5.2Vdc Series Pt # 5.0V Bus 3.3V Bus Vo (nom) Va (req'd) -3.9 -4.0 -4.1 -4.2 -4.3 -4.4 -4.5 -4.6 -4.7 -4.8 -4.9 -5.0 -5.1 -5.2 -5.3 -5.4 -5.5 -5.6 -5.7 -5.8 -5.9 -6.0 -6.1 -6.2 -6.3 -6.4 -6.5 212.0k 97.1k 59.0k 39.9k 28.4k 20.8k 15.3k 11.2k 8.1k 5.5k 3.4k 1.7k 0.2k PT6903/13 -1.5Vdc PT6901/11 PT6904/14 -2.0Vdc 3.1k 2.5k 1.9k 1.3k 0.8k 0.4k 0.0k PT6902/12 PT6905/15 -5.2Vdc (39.7)k (46.5)k (54.6)k (64.3)k (76.1)k (90.9)k (106.0)k (135.0)k (171.0)k (224.0)k (313.0)k (491.0)k (1020.0)k For technical support and more information, see inside back cover or visit www.ti.com/powertrends 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 acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, eitherexpress orimplied, is granted underany patent right, copyright, mask work right, orother intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 2000, Texas Instruments Incorporated |
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