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| PT6640 Series 24W 12V Input Positive to Negative Voltage Converter SLTS037A (Revised 6/30/2000) * Wide Input Voltage Range: +8V to +25V * Negative Output: -2.5V/4A to -15V/1.5A * Adjustable Output Voltage * 85% Efficiency * Remote Sense Capability The PT6640 series is a positive input to negative output line of Integrated Switching Regulators (ISRs). Designed for general purpose applications, the PT6640 series delivers a negative output voltage at up to 24W. The PT6640 is packaged in a 14-Pin SIP (Single In-line Package) and is available in a surface-mount configuration. Pin-Out Information Standard Application VIN 4,5,6 Ordering Information PT6641 PT6642 PT6643 PT6644 PT6645 PT6646 = -3.3 Volts = -5.0 Volts = -12.0 Volts = -9.0 Volts = -15.0 Volts = -2.5 Volts PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount Heat Spreader PT6640 11,12,13 1 7,8,9,10 -VOUT COM REMOTE SENSE C 1 = Required 560F electrolytic C 2 = Required 330F electrolytic Specifications Characteristics (Ta = 25C unless noted) Output Current Input Voltage Range Output Voltage T olerance Output Voltage Adjust Range Line Regulation Load Regulation Vo Ripple/Noise Transient Response with C 2 = 330F Efficiency For technical support and more information, see inside back cover or visit www.ti.com/powertrends + C1 + C2 LOAD COM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Remote Sense Do Not Connect Do Not Connect +Vin +Vin +Vin P D E -Vout -Vout -Vout -Vout GND GND GND Vout Adjust Pkg Style 400 PT6640 Note: Back surface of product is conducting metal PT6640 SERIES Symbols Io Conditions Ta = 60C, 200 LFM, pkg P Ta = 25C, natural convection Vo - 5.0V Vo= - 9.0V Vo= - 12.0V Vo= - 15.0V 0.1A I o Io max Vo = -2.5V/3.3V Vo = - 5.0V Vo = - 9.0V Vo = - 12.0V Vo = - 15.0V Min 0.1 0.1 0.1 0.1 0.1 +8 +8 +8 +8 +8 Vo-0.1 Vo = - 2.5V Vo = - 3.3V Vo = - 5.0V Vo = - 9.0V Vo = -12.0V Vo = -15.0V -1.8 -2.2 -3.0 -6.0 -9.0 -10.0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- Typ -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 0.5 0.5 3.0 200 100 75 79 83 85 84 74 77 80 84 Max (See Note 2) Units 4.0 2.5 2.0 1.5 +27 +25 +21 +18 +15 Vo+0.1 -4.3 -4.7 -6.5 -10.2 -13.6 -17.0 1.0 1.0 -- -- -- -- -- -- -- -- -- -- -- -- A Vin V Vo Voadj Over Vin range Ta = -40C to +65C Pin 14 to V o or ground V V Regline Regload Vn ttr Vos +9VVin+V inmax, I o = Iomax Vin = +12V, 0.1 IoIo max Vin = +12V, Io = Io max Io step between 0.5xIomax and I omax Vo over/undershoot Vin = +12V, Io = 0.5x Io max Vo = - 2.5V Vo = - 3.3V Vo = - 5.0V Vo = -9.0/12.0V Vo = -15.0V %Vo %Vo %Vo Sec mV % Vin = +12V, I o = I omax Vo = - 2.5V Vo = - 3.3V Vo = - 5.0V Vo = -9.0/12.0/15.0V % Continued PT6640 Series 24W 12V Input Positive to Negative Voltage Converter Specifications (continued) Characteristics (Ta = 25C unless noted) Switching Frequency Absolute Maximum Operating T emperature Range Storage T emperature Mechanical Shock Mechanical Vibration Weight PT6640 SERIES Symbols o Ta Ts -- -- -- Conditions +9V Vin V inmax Over Io range Over V in range -- Per Mil-STD-883D, Method 2002.3 Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, soldered in a PC board -- Min 500 -40 -40 -- -- -- Typ 550 -- -- 500 7.5 14 Max 600 +85 (2) Units kHz C C G's G's grams +125 -- -- -- Notes: (1) The PT6640 Series requires a 330F(output) and 560F(input) electrolytic capacitors for proper operation in all applications. (2) See Safe Operating Area curves or call the factory for guidance on thermal derating. TYPICAL CHARACTERISTICS Characteristic Curves @12.0V Vin Efficiency vs Output Current 90.0 85.0 80.0 75.0 70.0 65.0 60.0 0 0.5 1 1.5 2 2.5 3 3.5 4 (See Note A) Safe Operating Area Curves PT6642, @Vin =12V 90.0 80.0 70.0 (See Note B) Ambient Temperature ( C) Efficiency (%) Airflow 60.0 50.0 40.0 30.0 20.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 200LFM 120LFM 60LFM Nat conv PT6643 PT6642 PT6641 PT6646 Output Current (A) Output Current (A) Ripple vs Output Current 150 125 100 75 50 25 0 0 0.5 1 1.5 2 2.5 3 3.5 4 Ripple (mV) PT6645 PT6643 PT6644 PT6642 PT6641 PT6646 Output Current (A) Power Dissipation vs Output Current 6 5 PDiss (Watts) 4 3 2 1 0 0 0.5 1 1.5 2 2.5 3 3.5 4 PT6645 PT6643 PT6644 PT6642 PT6641 PT6646 Output Current (A) Note A: Characteristic data 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 rated operating temperatures. For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes PT6640 Series Adjusting the Output Voltage of the PT6640 24W Positive to Negative ISR Series The negative output voltage of the Power Trends PT6640 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 negative output voltage is obtained by adding a resistor R2, between pin 14 (Vo adjust) and pins 7-10 (-Vout). Figure 1 +V in 4,5,6 +V in PT6640 GND 11,12,13 SNS(+) 1 V out 7,8,9,10 V out V o(adj) 14 C in 5 6 0F + R2 |-V o | Up + C out 3 3 0F L O A D (R1) |-V o | Down COM COM Adjust Down: Adding a resistor (R1), between pin 14 (Vo adjust) and pins 11-13 (GND), decreases the output voltage magnitude. 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. Use only a single 1% resistor in either the (R1) or R2 location. Place the resistor as close to the ISR as possible. 2. Never connect capacitors from Vo adjust to either GND, Vout, or the Remote Sense pin. Any capacitance added to the Vo adjust pin will affect the stability of the ISR. 3. If the Remote Sense feature is being used, connecting the resistor (R1) between pin 14 (Vo adjust) and pin 1 (Remote Sense) can benefit load regulation. 4. The maximum allowed input voltage (Vin) will change as Vout is adjusted. The difference between the input voltage (Vin) and the output voltage (Vout) must not exceed 30V or 10 x Vout, whichever is less. Use one of the following formulas to determine the maximum allowed input voltage for the PT6640. Vout greater than 2.73V , = 30 - Vout Vin(max) Vdc The values of (R1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. Ro (Vo - 1.25)(Va - 1.25) 1.25 (Vo - Va) (R1) = - Rs k R2 = Ro (Vo - 1.25) Va - Vo - Rs k Where: Vo Va Ro Rs = Original Vout (magnitude) = Adjusted Vout (magnitude) = The resistance value in T able 1 = The series resistance from T able 1 , For example, if Vout = -12V Vin(max) = 30 - -12 = 18Vdc , Vout less than 2.73V = 10 x Vout Vin(max) Vdc Table 1 PT6640 ADJUSTMENT AND FORMULA PARAMETERS Series Pt # Vo (nom) Va (min) Va (max) Ro (k) Rs (k) PT6646 -2.5V -1.8V -4.3V 4.99 2.49 PT6641 -3.3V -2.2V -4.7V 4.22 4.99 PT6642 -5.0V -3.0V -6.5V 2.49 4.99 PT6644 -9.0V -6.0V -10.2V 2.0 12.7 PT6643 -12.0V -9.0V -13.6V 2.0 12.7 PT6645 -15.0V -10.0V -17.0V 2.0 12.7 For technical support and more information, see inside back cover or visit www.ti.com/powertrends Application Notes continued PT6640 Series Table 2 PT6640 ADJUSTMENT RESISTOR VALUES Series Pt # Current Vo (nom) Va (req'd) -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 -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 R1 = (Blue) R2 = Black 88.4k 41.7k 26.1k 18.4k 13.7k 10.6k 8.4k 6.7k 5.4k 4.4k 3.5k 2.8k 2.2k 1.7k 1.2k 59.9k 28.7k 18.3k 13.1k 10.0k 7.9k 6.4k 5.3k 4.4k 3.8k 3.2k 2.7k 2.3k 2.0k 1.7k 1.4k 1.2k 1.0k 81.5k 38.3k 23.8k 16.6k 12.3k 9.4k 7.4k 5.8k 4.6k 3.7k 2.9k 2.2k 1.7k 1.2k PT6646 4Adc -2.5Vdc (1.4)k (2.9)k (5.0)k (8.1)k (13.3)k (23.7)k (54.9)k (1.0)k (2.3)k (3.9)k (5.8)k (8.4)k (11.7)k (16.5)k (23.6)k (35.4)k (59.0)k (130.0)k (1.6)k (2.3)k (3.1)k (4.0)k (5.1)k (6.2)k (7.6)k (9.1)k (10.9)k (13.0)k (15.6)k (18.7)k (22.6)k (27.6)k (34.2)k (43.6)k (57.6)k (80.9)k (128.0)k (268.0)k PT6641 4Adc -3.3Vdc PT6642 4Adc -5.0Vdc Series Pt # Current Vo (nom) Va (req'd) -6.0 -6.2 -6.4 -6.6 -6.8 -7.0 -7.2 -7.4 -7.6 -7.8 -8.0 -8.2 -8.4 -8.6 -8.8 -9.0 -9.2 -9.4 -9.6 -9.8 -10.0 -10.2 -10.4 -10.6 -10.8 -11.0 -11.2 -11.4 -11.6 -11.8 -12.0 -12.2 -12.4 -12.6 -12.8 -13.0 -13.2 -13.4 -13.6 -13.8 -14.0 -14.2 -14.5 -15.0 -15.5 -16.0 -16.5 -17.0 42.3k 14.8k 5.6k 1.1k 94.8k 41.1k 23.1k 14.2k 8.8k 5.2k 2.7k 0.7k 64.8k 26.1k 13.1k 6.7k 2.8k 0.2k PT6644 2.5Adc -9.0Vdc (6.9)k (9.2)k (11.9)k (14.0)k (18.6)k (23.0)k (28.3)k (35.0)k (43.5)k (55.0)k (71.0)k (95.0)k (135.0)k (215.0)k (455.0)k (31.7)k (36.1)k (41.2)k (47.1)k (54.1)k (62.6)k (72.8)k (85.7)k (102.0)k (124.0)k (155.0)k (201.0)k (278.0)k (432.0)k (895.0)k (25.8)k (28.3)k (31.1)k (34.1)k (37.3)k (40.9)k (44.9)k (49.3)k (54.3)k (59.8)k (66.1)k (73.3)k (81.6)k (91.3)k (103.0)k (117.0)k (133.0)k (154.0)k (181.0)k (217.0)k (268.0)k (343.0)k (570.0)k PT6643 2Adc -12.0Vdc PT6645 1.5Adc -15.0Vdc For technical support and more information, see inside back cover or visit www.ti.com/powertrends I MPORTANT NOTI CE Te xas Instrume nts and its subsidiarie s (TI) re se rve the right to make change s to the ir products or to discontinue any product or se rvice without notice , and advise custome rs to obtain the late st ve rsion of re le vant information to ve rify, be fore placing orde rs, that information be ing re lie d on is curre nt and comple te . All products are sold subje ct to the te rms and conditions of sale supplie d at the time of orde r acknowle dgme nt, including those pe rtaining to warranty, pate nt infringe me nt, and limitation of liability. TI warrants pe rformance of its se miconductor products to the spe cifications applicable at the time of sale in accordance with TI's standard warranty. Te sting and othe r quality control te chnique s are utilize d to the e xte nt TI de e ms ne ce ssary to support this warranty. Spe cific te sting of all parame te rs of e ach de vice is not ne ce ssarily pe rforme d, e xce pt those mandate d by gove rnme nt re quire me nts. Custome rs are re sponsible for the ir applications using TI compone nts. In orde r to minimize risks associate d with the custome r's applications, ade quate de sign and ope rating safe guards must be provide d by the custome r to minimize inhe re nt or proce dural hazards. TI assume s no liability for applications assistance or custome r product de sign. TI doe s not warrant or re pre se nt that any lice nse , e ithe r e xpre ss or implie d, is grante d unde r any pate nt right, copyright, mask work right, or othe r inte lle ctual prope rty right of TI cove ring or re lating to any combination, machine , or proce ss in which such se miconductor products or se rvice s might be or are use d. TI's publication of information re garding any third party's products or se rvice s doe s not constitute TI's approval, warranty or e ndorse me nt the re of. Copyright (c) 2000, Te xas Instrume nts Incorporate d |
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