Supertex inc. FP0100 Fault Protection Switch with Current Fold-back Features ►► ►► ►► ►► General Description The Supertex FP0100 is a high voltage fault protection switch with current fold-back. It is designed to protect system output power supplies against over-current or short circuit conditions. In protection mode, the FP0100 limits the current to 300µA. Up to 100V input voltage protection Low on resistance – 4.0Ω typical Fast switching speed No external supplies needed The FP0100 can be considered as a normally closed switch with a typical switch resistance of 4.0Ω. The peak current allowed to pass through the switch can be set by an external resistor across VOUT and RSEN. Once the voltage drop across VIN and VOUT exceeds a nominal value of 3.0V, the input current will fold-back to 300µA. In the off state, the FP0100 can withstand up to 100V. Higher input voltages can be accommodated by using an external depletion-mode MOSFET. Please refer to Figure 4 for more details. The FP0100 is available in a SOT-89 package. Applications ►► ►► ►► ►► Power supplies Fast resettable fuse High side switches Data acquisition Typical Application Circuit VIN + VIN - RSEN FP0100 RSEN VOUT LOAD Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com FP0100 Ordering Information Package Device SOT-89 FP0100 FP0100N8-G -G indicates package is RoHS compliant (‘Green’) Pin Configuration Absolute Maximum Ratings VOUT Parameter Value VIN - VOUT, differential input voltage range 0 to +110V Maximum junction temperature RSEN VOUT +125°C Storage temperature range VIN -65° to +150°C Power dissipation, TA@25°C TO-243AA (SOT-89) (N8) 1.6W1 Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability. All voltages are referenced to device ground. Note: 1. Mounted on FR4 board, 25mm x 25mm x 1.57mm. Product Marking F10YW Y = Code for year sealed W = Code for week sealed = “Green” Packaging Package may or may not include the following marks: Si or TO-243AA (SOT-89) (N8) Electrical Characteristics (T A Sym VIN - VOUT IPEAK = 25OC unless otherwise specified) Parameter Differential input voltage range Peak current Min Typ Max Units Conditions 0 - 100 V - 260 - mA RSEN = 0Ω - 20 40 mA RSEN = 50Ω - 10 20 mA RSEN = 100Ω VOUT = GND, IIN = 600µA IOFF Off current - 300 600 µA VIN - VOUT = 100V, See I-V curve RON On resistance - 4.0 6.0 Ω IIN = 20mA, RSEN = 0Ω VTRIP VIN - OUT trip point to turn off - 3.0 - V RSEN = 50Ω, IIN = 90% of IPEAK See I-V curve VOFF Switch turn off voltage - - 4.5 V IOFF ≤ 600µA -40 - +125 °C --- TJ Operating junction temperature Block Diagram RSEN VIN Switch IPEAK + Control Control Supertex inc. VOUT ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 2 FP0100 Figure 1. Typical I-V Characteristics IPEAK 90% IPEAK IIN IOFF = 300µA IOFF VIN - VOUT VTRIP VOFF 100V Figure 2. Test Circuit for IPEAK vs RSEN IPEAK RSEN VIN + VIN - FP0100 RSEN VOUT The input peak current, IPEAK, can be lowered by adding an external resistor across the RSEN and VOUT pins as shown in the test circuit in Figure 2. IPEAK will decrease as the resis- tor value of RSEN increases. The typical IPEAK vs RSEN characteristic is shown in Figure 3. Figure 3. Typical IPEAK vs RSEN Characteristic IPEAK vs RSEN 1000.0 IPEAK (mA) 100.0 10.0 1.0 0.1 1.0 10.0 100.0 1000.0 10000.0 RSEN (Ω) Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 3 FP0100 Figure 4. Higher Input Voltage Application Input 0 to 450V DN3545 ±7.5V VIN 150kΩ RSEN FP0100 RSEN VOUT + 7.5V - Output Figure 5. Short Circuit Test Performance IIN VIN 10Ω + 220nF FP0100 VOUT VOUT 60V Short to Ground - The FP0100 has a typical response time of less than 30ns. The short circuit test set-up is shown in Figure 5. The output is at 60V prior to a short. A 10Ω resistor is used to measure the current going into the FP0100. A 220nF ceramic capacitor is added on the input to supply any transient currents that Supertex inc. RSEN might occur. The waveform is shown in Figure 6. Channel 1 is the output voltage which is discharged to 0V. Channel 2 is the voltage across the 10Ω resistor. The input current peaks to 400mA then decays quickly within 20ns. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 4 FP0100 Figure 6. Typical Short Circuit Waveforms 60V VOUT 0V 4.0V V10Ω 0V Pin Description Pin # Pin Name Description 1 VIN Input voltage 2, 4 VOUT Output voltage 3 RSEN Current sense for IPEAK control. Connects to an external resistor across the RSEN and VOUT pins to set the IPEAK. Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com 5 FP0100 3-Lead TO-243AA (SOT-89) Package Outline (N8) D D1 C E H L 1 2 E1 3 b b1 e A e1 Side View Top View Symbol Dimensions (mm) A b b1 C D D1 E E1 e MIN 1.40 0.44 0.36 0.35 4.40 1.62 2.29 2.00† NOM - - - - - - - - MAX 1.60 0.56 0.48 0.44 4.60 1.83 2.60 2.29 1.50 BSC e1 3.00 BSC H L 3.94 0.73† - - 4.25 1.20 JEDEC Registration TO-243, Variation AA, Issue C, July 1986. † This dimension differs from the JEDEC drawing Drawings not to scale. Supertex Doc. #: DSPD-3TO243AAN8, Version F111010. (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to http://www.supertex.com/packaging.html.) Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com) Supertex inc. ©2011 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSFP-FP0100 B051311 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 6