Signal lines should have 50 Ohm impedance while the package ground leads and exposed paddle should be connected directly to the ground plane similar to that shown. A sufficient number of via holes should be used to connect the top and bottom ground planes. The evaluation circuit board shown is...
This allows the user to dynamically set the operation bandwidth providing the capability of handling differ- ent types of modulations on the same platform. HMC909LP4E features an internal op-amp at output stage, which provides for slope / intercept adjustments and enables controller application. ...
Although not di- rectly part of the compensation, R9 decouples the op amp's output from Q1's large gate capacitance. A second loop provides a foldback current limit. A2 compares the sense voltage across R1 with 50mV refer- enced to the positive rail. When the sense voltage exceeds the ...
Error Amplifier The Error amplifier is composed of an internal OP-AMP with an R-C feedback network connected between its output node (internal COMP node) and its negative input node (FB). When FB is lower than its internal reference voltage (REF), the COMP output is then driven higher ...
The input voltage appears across the resistor generating currents which are mirrored into the high impedance node. Complementary followers form an output stage which buffers the gain node from the load. The bandwidth is set by the input resistor and the capacitance on the high impedance node. The...
It regulates the output during an overvolt- age event, such as load dump in automobiles, by control- ling the gate of an external N-channel MOSFET. The output is limited to a safe value thereby allowing the loads to continue functioning. The LT4356MP also monitors the voltage drop between...
Bootstrapped Hgh-Side Driver High Side Driver With Current Sense (Figure 4) Although no current sense function is included on the MIC5014/15 devices, a simple current sense function can be realized via the addition of one more active component; an LM301A op amp used as a comparator. The ...
DOUT(Pin 4): The output of the shift register which becomes valid on the rising edge of the serial clock. The DOUT pin is driven from GND to VCC by an internal CMOS inverter. Multiple LTC1257s may be cascaded by connecting the DOUT pin to the DIN pin of the next chip. GND (Pin ...
An internal 1.9μA pull-up current from INTVCC on this pin allows a capacitor to program output voltage slew rate. This pin is pulled to ground with an internal 200Ω MOSFET during shutdown and fault conditions; use a series resistor if driving from a low impedance output. This pin may ...
This technique means that the error amplifier commands current to be delivered to the output rather than voltage. A voltage fed system will have low phase shift up to the resonant frequency of the inductor and output capacitor, then an abrupt 180° shift will occur. The current fed system ...