722 SBVS016A - SEPTEMBER 1978 – REVISED JANUARY 2003 DUAL ISOLATED DC/DC CONVERTER DESCRIPTION FEATURES ● DUAL ISOLATED ±5V TO ±16V OUTPUTS ● HIGH BREAKDOWN VOLTAGE: 8000V Test ● LOW LEAKAGE CURRENT: < 1µA at 240V/60Hz ● LOW COST PER ISOLATED CHANNEL ● SMALL SIZE: 27.9mm x 27.9mm x 7.6mm (1.1" x 1.1" x 0.3") The 722 converts a single 5VDC to 16VDC input into a pair of bipolar output voltages of the same value as the input voltage. The converter is capable of providing a total output current of 64mA at rated voltage accuracy and up to 200mA without damage. The two output channels are isolated from the input and from each other. They may be connected independently, in series for higher output voltage or in parallel for higher output current, as a single channel isolated DC/DC converter. Integrated circuit construction of the 722 reduces size and cost. High isolation breakdown voltages and low leakage currents are assured by special design and construction that includes use of a high dielectric strength, low leakage coating used on the internal assembly. APPLICATIONS ● MEDICAL EQUIPMENT ● INDUSTRIAL PROCESS CONTROL ● TEST EQUIPMENT ● DATA ACQUISITION SYSTEMS A self-contained 900kHz oscillator drives switching circuitry, which is designed to eliminate the common problem of input current spiking due to transformer saturation or crossover switching. ● NUCLEAR INSTRUMENTATION P+ 11 Rectifiers and Filters V+ 20 E 18 Oscillator and Switch Drivers Rectifiers and Filters V– 16 1 +VO1 2 C1 3 –VO1 10 +VO2 9 C2 8 –VO2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright © 2003, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. www.ti.com PACKAGE/ORDERING INFORMATION PRODUCT 722 722BG 722MG PACKAGE-LEAD PACKAGE DESIGNATOR(1) SPECIFIED TEMPERATURE RANGE(2) PACKAGE MARKING ORDERING NUMBER TRANSPORT MEDIA, QUANTITY DIP-20 DIP-20 DIP-20 JND JND JND –25°C to +85°C –25°C to +85°C –25°C to +85°C 722 722BG 722MG 722G 722BG 722MG Rails, 17 Rails, 17 Rails, 17 NOTES: (1) For the most current specifications, and package information, refer to our web site at www.ti.com. (2) –25°C to +60°C for 16mA ≤ ILOAD ≤ 40mA per output. ELECTROSTATIC DISCHARGE SENSITIVITY ABSOLUTE MAXIMUM RATINGS(1) Supply Voltage, V+ to V– ..................................................................... 16V Input Current ................................................................................... 275mA Operating Temperature .................................................... –25°C to +80°C Storage Temperature ...................................................... –55°C to +125°C Junction Temperature ..................................................... –55°C to +125°C NOTE: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied. 2 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. 722 www.ti.com SBVS016A ELECTRICAL CHARACTERISTICS At TA = +25°C, VIN = 15VDC, C = 0.47µF, and R1 selected per typical characteristic, unless otherwise noted. 722 PARAMETER INPUT Rated Input Voltage Input Voltage Range(1) Input Current Input Ripple(2) ISOLATION Test Voltages Rated Voltages Isolation Impedance Leakage Current(3) OUTPUT Rated Output Voltages(4) Output Current Load Regulation Ripple Voltage Tracking Error between Dual Outputs Sensitivity to Input Voltage Changes Output Voltage Temperature Coefficient TEMPERATURE Specification Storage Junction Temperature CONDITIONS MIN TYP 722BG MAX MIN 16 ✽ Total Output Current = 12mA Total Output Current = 64mA Total Output Current = 64mA at TA = +85°C Total Output Current = 160mA Total Output Current = 12mA Total Output Current = 64mA Total Output Current = 160mA 50 105 120 — 3 6 — Input-to-Output, 5 seconds, min Input-to-Output, 1 minute, min Channel-to-Channel, 5 seconds, min Input-to-Output, continuous Channel-to-Channel, continuous Input-to-Output Input-to-Output, 240V, 60Hz ILOAD = 3mA per Output ILOAD = 16mA per Output ILOAD = 40mA per Output Total of All Outputs Any One Output(5) ✽ ✽ 120 ✽ 225 ✽ ✽ 12 — 8000 — 5000 3500 2000 3 15 35 — ±200 TA = TSPECIFICATION RANGE 1.13 ±0.02 ILOAD ≤ 16mA per Output ILOAD ≤ 40mA per Output –25 –25 –55 ✽ 16.2 16.2 — 200 100 ✽ ✽ 13.0 14.2 ✽ ✽ ✽ ✽ 50 ✽ 100 ✽ ✽ ✽ MAX ✽ ✽ ✽ ✽ ✽ ✽ — ✽ ✽ — 275 ✽ — ✽ 2500 ✽ ✽ ✽ ✽ ✽ 16.2 ✽ ✽ ✽ ✽ — ✽ ✽ ✽ mA mA mA, pk mA, pk mA, pk — ✽ ✽ — ✽ ✽ VDC VDC VDC mA mA ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ VDC VDC mA mA ✽ ✽ ✽ UNITS Vpk Vrms Vpk V V GΩ || pF µA ✽ ✽ ✽ +85 +60 +125 +125 TYP ✽ (5) ILOAD = 3mA per Output ILOAD = 16mA per Output ILOAD = 40mA per Output Balanced Loads ✽ ✽ 1 — MIN ✽ — ✽ ✽ ✽ ✽ 10 || 6 15.4 14.3 — 722MG MAX ✽ 15 5 TYP mVpk mVpk mVpk mVDC V/V %/°C ✽ ✽ ✽ ✽ °C °C °C °C ✽ Specifications same as 722. NOTES: (1) For ambient temperature above +70°C, the input voltage is 12.5V (max). The input voltage remains 16V (max) if case temperature is kept below +85°C. (2) External capacitor across P+ to V– pins and 12" of #24 wire to VIN. (3) Reference UL544, paragraph 27.5, Leakage Current. (4) See Typical Characteristics. (5) A minimum output current of 3mA at each output is recommended to maintain output voltage accuracy. 722 SBVS016A www.ti.com 3 TYPICAL CHARACTERISTICS At TA = +25°C, VIN = 15VDC, C = 0.47µF, and R1 selected per typical characteristic, unless otherwise noted. SELECTION OF R1 OR EXTERNAL VOLTAGE V+ FOR MINIMUM INTERNAL POWER DISSIPATION V+EXT 820Ω 510Ω 200Ω 510Ω 200Ω 0Ω 200Ω 0Ω 0Ω — — — 6.5V 7.5V 9.0V Case 100 100 75 75 Ambient 50 50 25 25 0 0 0 50 100 150 (2) Total Output Current 16 13 Total Output Current = 64mA 8 Total Output Current = 200mA 3 IF IF = 16mA 15 IF + VO – + VO – + Load IF = 3mA V – + Load Output Load Voltage, |VLOAD| (V) Total Output Current = 12mA V – IL IL 14 IF = 50mA 13 8 4 12 16 0 20 Input Voltage (V) SINGLE OUTPUT LOAD REGULATION Opposite Channel, Output Voltage, |VN| (V) IF = 16mA 15 IF 14 + VO – + + Load IF V – + VO VO – – IL IF IF = 50mA 13 0 20 40 60 80 100 CHANNEL-TO-CHANNEL INTERACTION 16 IF = 3mA 40 Output Load Current |IL| (mA) 60 80 100 Output Load Current |IL| (mA) 16 IF = 3mA 15 IF = 16mA IF = 50mA IF 14 + + VN V – + – + IF Load Output Voltage (V) (mA) SINGLE-CHANNEL LOAD REGULATION OUTPUT VOLTAGE vs INPUT VOLTAGE 18 Output Load Voltage, |VLOAD| (V) 200 VN IF V – IL – 13 0 20 40 60 80 100 Output Load Current |IL| (mA) NOTES: (1) Using a 104mm x 19mm x 1.6mm aluminum strip mounted to the bottom of the case with heat sink compound. (2) Total output current is the sum of the currents for each individual output. 4 722 www.ti.com SBVS016A Maximum Case Temperature(1) (°C) >13 11 to 13 9 to 11 8 to 9 <8 125 125 MAXIMUM OUTPUT CURRENT FROM ANY SINGLE OUTPUT 16mA to <16mA 30mA 30mA 1.3kΩ 820Ω 510Ω Maximum Ambient Temperature °C Input Voltage (V) MAXIMUM SAFE OPERATING TEMPERATURE vs TOTAL OUTPUT CURRENT TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VIN = 15VDC, C = 0.47µF, and R1 selected per typical characteristic, unless otherwise noted. PARALLEL OUTPUT UNBALANCED LOAD REGULATION PARALLEL OUTPUT BALANCED LOAD REGULATION Output Load Voltage, |VLOAD| (V) 14 V V V Load V Load Output Load Voltage, |VLOAD| (V) 15 IL IL V V VO VO IF = 6mA Load 16 16 IL IF 15 IF = 100mA 14 IF = 32mA 13 13 0 20 40 60 80 0 100 40 80 120 160 200 Output Load Current |IL| (mA) Output Load Current |IL| (mA) V IF = 6mA V Load Opposite Output, Output Voltage, |VN| (V) OUTPUT-TO-OUTPUT INTERACTION 16 IL IF 15 VN VN IF = 32mA 14 IF = 100mA 13 0 40 80 120 160 200 Output Load Current |IL| (mA) 722 SBVS016A www.ti.com 5 INSTALLATION AND OPERATING INSTRUCTIONS DISCUSSION Typical application connections for the 722 are shown in Figures 1 and 2. Primary power (VIN) is applied at the P+ and V– terminals. The common or ground for VIN may be connected to either P+ or V–; the only requirement is that P+ and V+ must be positive with respects to V–. At rated output voltage accuracy, the 722 is capable of providing 64mA divided among its four outputs(1). A minimum average output current of 3mA is recommended at each output to maintain voltage accuracy. OUTPUT CURRENT RATINGS The E pin enables the converter when connected to V+ and disables it when connected to V–. An external capacitor, C (0.47µF ceramic), is used to reduce input ripple. It should be connected as close to the P+ and V– pins as practical. Input leads to these terminals should also be kept as short as possible. External shielding may be appropriate in applications where RFI at the 900kHz nominal oscillator frequency is a problem because the 722 is not internally shielded. ISOLATION CONFIGURATIONS The fact that the two outputs of the 722 are isolated from the input and from each other allows both two-port and three-port isolation connections. Figure 1 shows TI’s 3650 optically coupled isolation amplifier connected in three-port configuration. One of the 722 channels provides power to the 3650 input. The other channel supplies power to the 3650 output. The amplifier input and output are isolated from each other and the system power supply common. In this configuration, the 722 channel-tochannel isolation specification applies to the amplifier inputto-output voltage. +15V +VO1 P+ C1 3650 Power for the internal oscillator and switch drivers is derived from the primary power by a voltage dropping resistor, R1. The value of R1 as a function of VIN is shown in the Typical Characteristics section. Alternately, voltage for the V+ terminal can be obtained from a separate source. V+ should be +5V to +7.5V positive with respect to V–. If a separate source is used, the V+ input must be applied before the P+ input in order to avoid possible damage to the unit. P+ and V+ must remain positive with respect to V– at all times (including transients). If necessary, diode clamps should be attached across these inputs. Output channels(2) can be connected in series or parallel for higher output voltage or current. C –VO1 V+ +VO2 Each output is filtered with an internal 0.22µF capacitor. Output ripple voltage can be reduced below the specified value by adding external capacitors up to 10µF between each output and its common. R1 E VIN C2 O/P I/P Com Com Com –VO2 V– 722 Power Supply Common FIGURE 1. Three-Port Isolation. NOTES: (1) “Output” denotes a single output terminal (+V or –V) and its associated common. (2) “Channel” denotes a pair of outputs (+V and –V) and their associated common. 6 722 www.ti.com SBVS016A Figure 2 illustrates how the 722 can provide isolated input power to the input stage of two 3650s connected in the twoport configuration. Power for the output stage is provided by the system +15V and –15V supplies. Input stages are isolated from each other and from the system supply. In this situation, the 722 input-to-output isolation specification applies to the amplifier input-to-output voltages, whereas the channel-to-channel 722 specification applies to the voltage existing between I/P Com #1 and I/P Com #2. SHORT CIRCUIT PROTECTION The circuit in Figure 3 may be added to the input of the 722 to protect it from damage in situations where too much current is demanded from the outputs—such as a short circuit from an output to its common. The circuit limits input current to approximately 150mA for an input voltage of 15VDC (for ß of 2N2219 of 50). +15V –15V P+ +VO1 3650 + C1 R1 3.6kΩ V+ –VO1 VIN O/P Com +15V C E +VO2 IN4148 +VO1 P+ C1 2N2219 100Ω C2 1Ω – R1 V– –VO2 722 –VO1 V+ I/P Com #1 +VO2 E VIN C2 Com –VO2 V– I/P Com #2 FIGURE 3. Short-Circuit Protection. 722 +15V –15V O/P Com 3650 –15V O/P Com FIGURE 2. Two-Port Isolation with Two 3650s. 722 SBVS016A www.ti.com 7 PACKAGE DRAWING JND (R-CDIP–P20) CERAMIC DUAL-IN-LINE 1.120 (28,45) 1.080 (27,43) 20 11 Index Area 1.120 (28,45) 1.080 (27,43) 0.100 (2,54) 1 1 0 0.100 (2,54) 0.010 (0,25) 0.002 (0,05) 0.285 (7,24) 0.235 (5,97) Seating Plane 0.350 (8,89) 0.150 (3,81) 0.100 (2,54) 0.050 (1,27) 0.035 (0,89) 0.900 (22,86) 0.021 (0,53) 0.018 (0,46) 4202121/A 03/01 NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject to change without notice. C. Leads in true position within 0.010 (0,25) R @ MMC at seating plane. D. Pin numbers shown for reference only. Numbers may not be marked on package. E. A visual index feature must be located within the cross–hatched area. 8 722 www.ti.com SBVS016A PACKAGE OPTION ADDENDUM www.ti.com 3-Oct-2003 PACKAGING INFORMATION ORDERABLE DEVICE STATUS(1) PACKAGE TYPE PACKAGE DRAWING PINS PACKAGE QTY 0722BG NRND CDIP JND 20 17 0722MG NRND CDIP JND 20 17 722G ACTIVE CDIP JND 20 17 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. 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