XRP7604 Exar Corporation, XRP7604 Datasheet
XRP7604
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XRP7604 Summary of contents
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... The XRP7604 is pin compatible with Exar’s XRP7603 and SP7600, non synchronous buck high power led drivers respectively rated at 500mA and 2A. The XRP7604 is offered in a compact thermally enhanced RoHS compliant “green”/halogen free 8-pin SO package. TYPICAL APPLICATION DIAGRAM Exar Corporation ...
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... VDR Voltage Over-Current Threshold ISET Pin Input Current OFF Interval During Hiccup SHDN Threshold SHDN Threshold Hysteresis Switch On Resistance Switch Leakage Note 1: All parameters tested at T =25°C. Specifications over temperature are guaranteed by design. A © 2009 Exar Corporation ...
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... Exar Corporation Fig. 2: XRP7604 Block Diagram Fig. 3: XRP7604 Pin Assignement 3/ ...
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... J XRP7604EDBTR-F -40°C≤T ≤+125°C J XRP7604EVB XRP7604 Evaluation Board “YY” = Year – “WW” = Work Week – “F” = Green/Halogen Free designator – “LOT#” = Lot Number © 2009 Exar Corporation ...
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... TYPICAL PERFORMANCE CHARACTERISTICS The typical performance characteristics follow and begin with an illustration of the efficiencies that can be obtained with the XRP7604 driving white LEDs in series for up to 500mA 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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... VFB versus Vin at Iout = 750mA 0.210 1 LED 0.205 0.200 0.195 0.190 Vin(V) Fig. 6: Feedback Voltage vs Input Voltage Fig Cout, Output Ripple=284mVpp, Vin=29V 1 LED, Vf=3.3V @ 0.75A Fig. 10: 5V Vin Startup 1 LED, Vf=3.3V @ 0.75A © 2009 Exar Corporation ...
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... Fig. 12: 29V Vin Startup 1 LED, Vf=3.3V @ 0.75A © 2009 Exar Corporation Ch1: Vin Ch2: Vout Ch3: VFB Ch4: Io 2A/div Fig. 13: Output Overcurrent Hiccup mode with Vin=29V 7/ ...
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... This external signal we call DIM turns the MOSFET gate drive on/off, thereby modulating the average current delivered to the LED. The DIM signal connects to the VFB pin through a 1N4148 diode and will shutdown the XRP7604 when DIM = H and turn-on the XRP7604 when © 2009 Exar Corporation ...
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... Fig. 16: Linearity, LED current vs (1-D) PWM Dimming Duty Cycle, Vin=12V, Io=0.75A, 2 LED in series M ODULATOR OPERATION AND POWER SEQUENCING The XRP7604 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 ...
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... Schottky that meets the calculated current rating and has a lower Vf. F EEDBACK RESISTOR Cin (µ part of XRP7604 loop compensation 2.2 network. Use a 30k R2 for Vin of 20V and 4.7 larger. Use R2 of 60K for Vin less than 20V 4.7 ...
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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 XRP7604 layout see the XRP7604EVB available on our web site. Each layer is shown in detail as well as a complete bill of materials. ...
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... PACKAGE SPECIFICATION 8-P HSOICN IN © 2009 Exar Corporation 12/ ...
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... While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ...