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LTC3860IUHTRPBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC3860IUHTRPBF Datasheet(HTML) 11 Page - Linear Technology |
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11 / 36 page  LTC3860 3860f Overcurrent Protection The current sense amplifier outputs also connect to overcurrent (OC) comparators that provide fault protec- tion in the case of an output short. When an OC fault is detected, the controller three-states the PWM output, resets the soft-start capacitor, and waits for 32768 clock cycles before attempting to start up again. The LTC3860 also provides negative OC (NOC) protection by preventing turn-on of the bottom MOSFET during a negative OC fault condition. The negative OC threshold is equal to –3/4 the positive OC threshold. See Applications Information for guidelines on setting these thresholds. Excellent Transient Response The LTC3860 error amplifiers are true operational ampli- fiers,meaningthattheyhavehighbandwidth,highDCgain, low offset and low output impedance. Their bandwidth, when combined with high switching frequencies and low- value inductors, allows the compensation network to be optimizedforveryhighcontrolloopcrossoverfrequencies and excellent transient response. The 600mV internal ref- erence allows regulated output voltages as low as 600mV without external level-shifting amplifiers. Line Feedforward Compensation TheLTC3860achievesoutstandinglinetransientresponse using a feedforward correction scheme which instanta- neously adjusts the duty cycle to compensate for changes in input voltage, significantly reducing output overshoot and undershoot. It has the added advantage of making the DC loop gain independent of input voltage. Figure 2 shows how large transient steps at the input have little effect on the output voltage. operaTion (Refer to Functional Diagram) Figure 2 20µs/DIV VOUT = 1.2V VIN STEP = 7V TO 14V 3860 G20 VOUT 50mV/DIV IL 2A/DIV VIN 5V/DIV COMP1 100mV/DIV Remote Sense Differential Amplifier The LTC3860 includes a low offset, unity gain, high bandwidth differential amplifier for remote output sens- ing. Output voltage accuracy is significantly improved by removing board interconnection losses from the total error budget. The LTC3860 differential amplifier has a typical output slew rate of 45V/µs, bandwidth of 20MHz, input referred offset < 2mV and a typical maximum output voltage of VCC – 1V. The amplifier is configured for unity gain, meaning that the differential voltage between VSNSP and VSNSN is translated to VSNSOUT, relative to SGND. |
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