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SC1548CSK-1.5TR Datasheet(PDF) 11 Page - Semtech Corporation |
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SC1548CSK-1.5TR Datasheet(HTML) 11 Page - Semtech Corporation |
11 / 14 page 11 ã 2001 Semtech Corp. www.semtech.com SC1548 POWER MANAGEMENT Theory Of Operation The SC1548 linear FET controller provides a simple way to drive an N-channel MOSFET to produce a tightly regulated output voltage from an available, higher, supply voltage. It takes its power from a 12V supply, drawing typically 2mA while operating. It contains an internal bandgap reference which is compared to the output voltage via a resistor divider. This resistor divider is internal on the fixed output voltage options, and user selectable on the adjustable option. Since the drive pin can pull up to a 9V guaranteed minimum, the device can be used to regulate a large range of output voltages by careful selection of the external MOSFET (see component selection, below). The SC1548 includes an active high enable control with an internal pullup resistor. If this pin is pulled low, the drive pin is pulled low, turning off the N-channel MOSFET. If the pin is left open or pulled up to 2.5V, 3.3V or 5V, then the drive pin will be enabled. Also included is an overcurrent protection circuit that monitors the output voltage. If the output voltage drops below 50% of nominal, as would occur during an overcurrent or short condition, the device will pull the drive pin low and latch off. Fixed Output Voltage Options Please refer to the Application Circuit on Page 1. The fixed output voltage parts have an internal resistor divider that draws a nominal 100µA from the output. The voltage at the common node of the resistor divider is then compared to the bandgap reference voltage of 1.263V. The drive pin voltage is then adjusted to maintain the output voltage set by the resistor divider. Referring to the block diagram on page 5, the nominal resistor values are: e g a tl o V t u p t u Ok ( 1 R W)k ( 1 R W) V 5 1 5 . 12 5 . 23 6 . 2 1 V 8 1 8 . 15 5 . 53 6 . 2 1 Typical Characteristics (Cont.)(1) Output Short Circuit Glitch Immunity Trace 1: V DRV, 5V/div. Trace 2: V OUT, 1V/div. Timebase: 1ms/div SC1548 enabled, then shorted, therefore V OUT < VTH(OC) immediately the short is applied. This device shuts down after 5ms. Note: (1) See Applications Circuit on page 1. Applications Infomation |
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