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SP6120 Datasheet(PDF) 8 Page - Sipex Corporation |
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SP6120 Datasheet(HTML) 8 Page - Sipex Corporation |
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8 / 22 page  8 Date: 5/25/04 SP6120 Low Voltage, AnyFETTM, Synchronous, Buck Controller © Copyright 2004 Sipex Corporation General Overview The SP6120 is a constant frequency, voltage mode PWM controller for low voltage, DC/DC step down converters. It has a main loop where an external resistor (ROSC) sets the frequency and the driver is controlled by the comparison of an error amp output (COMP) and a 1V ramp signal. The error amp has a transconductance of 600 µS, an output impedance of 3 MΩ, an inter- nal pole at 2 MHz and a 1.25V reference input. Although the main control loop is capable of 0% and 100% duty cycle, its response time is lim- ited by the external component selection. There- fore, a secondary loop, including a window comparator positioned 3% above and below the reference, has been added to insure fast re- sponse to line and load transients. A unique “Ripple & Frequency Independent” algorithm, added to the secondary loop, insures that the window comparator does not interfere with the main loop during normal operation. In addition to receiving driver commands from the main and secondary loops, the Driver Logic is also controlled by the Programming Logic, Fault Logic and Zero Crossing Comparator. The Pro- gramming Logic tells the Driver Logic whether the controller is using a PFET or NFET high side Figure 14. V CC Start Threshold vs. Temperature Figure 15. V CC Stop Threshold vs. Temperature Figure 16. Oscillator Frequency vs. Temperature Figure 17. Oscillator Frequency vs. R OSC with VCC = 5V and CGH = CGL = Open. 2.900 -40 -15 10 35 60 85 Temperature (°C) 2.875 2.850 2.825 2.800 2.850 -40 -15 10 35 60 85 Temperature (°C) 2.825 2.800 2.775 2.750 302 -40 -15 10 35 60 85 Temperature (°C) 301 300 299 298 200 300 400 500 600 700 800 510 15 2025 30 ROSC (kΩ) TYPICAL PERFORMANCE CHARACTERISTICS: Continued Unless otherwise specified: VCC = BST = ENABLE = 3.3V, ROSC = 18.7k, CCOMP = 0.1µF, CSS = 0.1µF, CGH = CGL = 3.3nF, VFB = 1.25V, ISP = ISN = 1.25V, SWN = GND = PGND = 0V, TAMB = 25°C. THEORY OF OPERATIONS |
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