For assistance or to order, call Application Notes Mechanical Outline Product Selector Guide (800) 531-5782 PT78NR100 S e r i e s 1 AMP PLUS TO MINUS VOLTAGE INTEGRATED SWITCHING REGULATOR • • • • • • Negative output from positive input Wide Input Range Self-Contained Inductor Short Circuit Protection Over-Temperature Protection Fast Transient Response Pin-Out Information Standard Application Vin C1 1 PT78NR100 + 3 Function 1 +Vin 2 -Vout 3 GND -Vout 2 C2 Pin + COM COM C1 = Required 100µF electrolytic C2 = Required 100µF electrolytic Specifications Revised 5/15/98 The PT78NR100 Series creates a negative output voltage from a positive input voltage greater than 7V. These easy-to-use, 3-terminal, Integrated Switching Regulators (ISRs) have maximum output power of 5 watts and a negative output voltage that is laser trimmed. They also have excellent line and load regulation. Ordering Information PT78NR1 XX Y Output Voltage Package Suffix 03 = -3.0 Volts 05 = -5.0 Volts 52 = -5.2 Volts 07 = -7.0 Volts 08 = -8.0 Volts 09 = -9.0 Volts 12 = -12.0 Volts 15 = -15.0 Volts V = Vertical Mount S = Surface Mount H = Horizontal Mount Pkg Style 500 PT78NR100 SERIES Characteristics (Ta= 25°C unless noted) Symbols Conditions Output Current Io Over Vin range Vo=-5V Vo=-7, -8, -9V Vo=-12V Vo=-15V Min Typ Max Units 0.05* 0.05* 0.05* 0.05* — — — — 1.00 0.55 0.40 0.30 A A A A Short Circuit Current Isc Vin=10V — 4×Imax — Apk Inrush Current Iir tir Vin=10V On start-up — — 4 0.5 — — A mSec Input Voltage Range Vin 0.1 ≤ Io ≤ Imax 7 7 7 7 — — — — 25 21 18 15 V V V V Output Voltage Tolerance ∆Vo Over Vin range Ta=-20°C to +70°C — ±1.0 ±3.0 %Vo Line Regulation Regline Over Vin range — ±0.5 ±1.0 %Vo Load Regulation Regload 0.1 ≤ Io ≤ Imax — ±0.5 ±1.0 %Vo Vo Ripple/Noise Vn Vin=10V, Io=Imax — ±2 — %Vo Transient Response (with 100µF output cap) ttr 50% load change Vo over/undershoot — — 100 5.0 250 — µSec %Vo Efficiency η Vin=10V, Io=0.5×Imax, Vo = -5V — 75 — % Switching Frequency ƒo Over Vin and Io ranges 600 650 700 kHz Absolute Maximum Operating Temperaturte Range Ta Free Air Convection, (40-60LFM) Over Vin and Io Ranges -40 — +85 °C Recommended Operating Temperature Range Ta Free Air Convection, (40-60LFM) Over Vin and Io Ranges -40 — +60** °C Thermal Resistance θja Free Air Convection, (40-60LFM) — 45 — °C/W Storage Temperature Ts — -40 — +125 °C Mechanical Shock — Per Mil-STD-883D, Method 2002.3 — 500 — G’s Mechanical Vibration — Per Mil-STD-883D, Method 2007.2, 20-2000 Hz, soldered in a PC board — 5 — G’s Weight — — — 6.5 Vo=-5V Vo=-7, -8, -9V Vo=-12V Vo=-15V *ISR will operate down to no load with reduced specifications. **See Thermal Derating chart. Note: The PT78NR100 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications. 14 Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com Grams For assistance or to order, call (800) 531-5782 PT78NR100 S e r i e s CHARACTERISTIC Efficiency vs Output Current Efficiency vs Output Current Vin 80 7.0V 12.0V 15.0V 20.0V 25.0V 70 60 Efficiency - % 90 100 90 90 80 Vin 7.0V 70 12.0V 15.0V 18.0V 60 Vin 80 7.0V 9.0V 12.0V 15.0V 20.0V 70 60 21.0V 50 50 50 40 0 0.2 0.4 0.6 0.8 40 40 1 0 0.1 0.2 Iout-(Amps) 0.3 0.4 0.5 0 0.1 Iout-(Amps) Ripple vs Output Current 200 160 21.0V 120 18.0V 15.0V 12.0V 80 7.0V 40 Ripple-(mV) Ripple-(mV) Vin 25.0V 20.0V 15.0V 12.0V 7.0V 80 0.4 Ripple vs Output Current Vin 120 0.3 250 200 160 0.2 Iout-(Amps) Ripple vs Output Current 200 Ripple-(mV) (See Note 1) Efficiency vs Output Current 100 Efficiency - % 100 Efficiency - % PT78NR112 -12.0 VDC (See Note 1) 40 150 Vin 100 20.0V 15.0V 12.0V 9.0V 7.0V 50 0 0 0.2 0.4 0.6 0.8 1 0 0 0 0.1 0.2 Iout-(Amps) Thermal Derating (Ta) 0.3 0.4 0.5 0 0.1 Thermal Derating (Ta) (See Note 2) 1 60°C 0.3 Thermal Derating (Ta) (See Note 2) 0.4 0.6 70°C 0.9 0.2 0.4 Iout-(Amps) Iout-(Amps) 70°C (See Note 2) 70°C 0.35 0.5 0.8 85°C 0.6 0.5 0.4 Iout-(Amps) Iout-(Amps) Iout-(Amps) 0.3 0.7 0.4 85°C 0.3 0.2 0.3 0.25 85°C 0.2 0.15 0.1 0.2 0.1 0.05 0.1 0 0 7 10 13 16 19 22 25 0 7 11 15 Vin-(Volts) 19 7 10 Vin-(Volts) Power Dissipation vs Output Current 13 16 19 Vin-(Volts) Power Dissipation vs Output Current Power Dissipation vs Output Current 2 1.6 1.6 1.8 1.4 1.4 1.6 1.2 Vin 20.0V 15.0V 1 12.0V 0.8 7.0V 1.2 Vin 1 21.0V 18.0V 0.8 15.0V 12.0V 0.6 7.0V PD-(Watts) 25.0V 1.2 PD-(Watts) PD-(Watts) 1.4 VinV 1 20.0V 15.0V 0.8 12.0V 9.0V 0.6 7.0V 0.6 0.4 0.4 0.4 0.2 0.2 0.2 0 0 0 0.2 0.4 0.6 Iout-(Amps) 0.8 1 0 0.1 0.2 0.3 0.4 0.5 0 0 0.1 Iout-(Amps) 0.2 0.3 0.4 Iout-(Amps) Note 1: All data listed in the above graphs, except for derating data, has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. Note 2: Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.) Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com 15 DATA SHEETS PT78NR109 -9.0 VDC (See Note 1) Wide Input Range Products PT78NR105 -5.0 VDC DATA 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. 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