sp7600 Exar Corporation, sp7600 Datasheet
sp7600
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sp7600 Summary of contents
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... Lead Free, RoHS Compliant Package ______________________________________________________DESCRIPTION The SP7600 is a PWM controlled step down (buck) voltage mode regulator with internal P-Channel MOSFET. It has a wide 4.5V to 30V single input voltage supply. The 200mV internal reference has been selected to allow ease of use in LED driver applications. It has a 5V LDO to power internal circuitry ...
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... V 100 mV 95 mΩ µA SP7600 2 SP7600 ≤ ≤ T 125°C. J ♦ CONDITIONS °C≤T ≤125° °C≤T ≤125° °C≤T ≤125° ♦ VFB=0.1V, not switching VFB=1.2V, not switching ♦ ...
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... V Power Can be connected to inductor LX node for a thermal PAD – see Layout 9 Pad suggestions section. 12/17/07 rev: A EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000 DESCRIPTION = 350mV – 33uA * R TRSHLD ©Copyright 2007 Exar Corporation SP7600 3 SP7600 ...
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... DIAGRAM 12/17/07 rev: A EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000 ©Copyright 2007 Exar Corporation SP7600 4 SP7600 ...
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... The output voltage will adjust as needed to ensure average I output current has to be set at 0.35A then RFB=0.57 Ohm. If the output LED has a corresponding Vf of 3.5V then SP7600 will step down the Vin to 3.5V. If two of these LEDs are placed in series then SP7600 will step down the voltage to 7V. Superimposed magnitude to inductor current ripple ...
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... Ch1 = DIM signal, Ch2 = VFB 200mV/div = 2A Output current/div Figure 2. 1KHz, 70% duty cycle dimming signal is approximately 10% LED duty cycle Ch1 = DIM signal, Ch2 = VFB 200mV/div = 2A Output current/div 12/17/07 rev: A EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000 ©Copyright 2007 Exar Corporation SP7600 6 SP7600 ...
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... Figure 3. LED Duty Cycle Vs (1-D) DIM pin Duty Cycle with 12Vin, 2 Luxeon K2s in parallel at Modulator Operation and Power Sequencing The SP7600 has a unique modulator design which improves the device’s ability to operate at very high duty cycle. While seamless in operation as the duty cycle is increasing (input voltage falling), when the duty cycle is decreased (input voltage rising), the user will observe the switching frequency increasing in distinct fractions of the switching frequency ...
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... Ceramic capacitors are recommended for input filtering due to their low Equivalent Series Resistance (ESR), Equivalent Series inductance (ESL) and small form factor. 12/17/07 rev: A EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000 ) × Rds ( on ) ………… (2) SP7600 8 SP7600 ©Copyright 2007 Exar Corporation ...
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... In order to improve the efficiency in these applications choose a Schottky that meets the calculated current rating and has a lower Vf. Feedback resistor RFB R2 is part of SP7600 loop compensation network. Use a 30k R2 for Vin of 20V and larger. Use R2 of 60K for Vin less than 20V. Capacitor C5 This is the decoupling capacitor for the power supply for the internal driver ...
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... Use the standard resistor value for Rs of 470ohms. Figure 4 - Circuit schematic for design example 12/17/07 rev: A EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000 ) × 095 Ohm = 424 Ohm SP7600 10 SP7600 ©Copyright 2007 Exar Corporation ...
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... Keep other sensitive circuits and traces away from the LX node in particular and away from the power supply completely if possible. For more detail on the SP7600 layout see the SP7600EB Evaluation Board Manual available on our web site. Each layer is shown in detail as well as a complete bill of materials. ...
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... The typical performance characteristics follow and begin with an illustration of the efficiencies that can be obtained with the SP7600 driving white LEDs in parallel for total current or in series for 6 LEDs output current. For the 6 LED applications with a 24V input, the duty cycle is high and an efficiency of 94% can be obtained ...
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... Vin (V) VFB vs Vin, CFB = 22pF 1LED, Io=2A 1LED, Io=1A 6LED, Io=2A 6LED, Io= Vin (V) SP7600 13 SP7600 ©Copyright 2007 Exar Corporation ...
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... A EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000 = 25°C unless otherwise noted. A ©Copyright 2007 Exar Corporation SP7600 14 SP7600 Ch1 = LX 10V/div Ch2 = Vout(AC) 200mV/div Ch4 = ILX 2A/div Ch1 = LX 10V/div Ch2 = Vout(AC) 500mV/div Ch4 = ILX 2A/div Ch1 = LX 20V/div ...
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... A EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000 = 25°C unless otherwise noted. A ©Copyright 2007 Exar Corporation SP7600 15 SP7600 Ch1 = Vin 10V/div Ch2 = Vout 2V/div Ch3 = VFB 200mV/div Ch4 = ILX 2A/div Ch1 = Vin 10V/div Ch2 = Vout 2V/div ...
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... EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000 TYPICAL PERFORMANCE CHARACTERISTICS = 25°C unless otherwise noted. A ©Copyright 2007 Exar Corporation SP7600 16 SP7600 Ch1 = LX 20V/div Ch2 = Vout 2V/div Ch3 = VFB 50mV/div Ch4 = ILX 2A/div Ch1 = LX 20V/div Ch2 = Vout 2V/div ...
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... HSOICN 12/17/07 rev: A EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000 ©Copyright 2007 Exar Corporation SP7600 17 SP7600 ...
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... INFORMATION Model SP7600EN2-L........................................... -40°C to +125°C ................... (Lead-free) 8-pin HSOICN SP7600EN2-L/TR ..................................... -40°C to +125°C ................... (Lead-free) 8-pin HSOICN /TR = Tape & Reel ______________________________________________REVISION HISTORY DATE REVISION December 2007 A For further assistance: Email: EXAR Technical Documentation: EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability ...