Two (2) Boards; one with varying impedance and one with ‘flat’ impedance
Provisions are included for a Bode plot measurement, with the injection resistor, R5, included as well as test-points for the injection signal and measurement (TP3 and TP4). SMA output connectors are also included to simplify connections for many measurements including the 2-port output impedance measurement, step load and other common measurements.
The board is USB powered by connecting a USB cable with a type B connector to the power connector USB1. (CAUTION: R9 and R10 GET HOT - DO NOT TOUCH)
|TP1||Input voltage meter or probe|
|TP2||Ground for meter or probe|
|LM20143||LM20143 Flat Impedance VRM Demo Board V1.0||
The circuit is an integrated point of load synchronous buck regulator with a 5V input and a 1.2V/2.5A output. The device uses emulated current mode control, making it simple to create a flat impedance output. Easily accessible 0805 chip size components make it easy to customize or experiment with different component values. This is a fully self-contained demo board using USB input power and an on-board resistive load.
SIGNAL INJECTORS NEEDED
|2-port output impedance||J2102A two SMA cables (optional two P2130A or J2130A)|
|Load Step||J2111A or J2150A and J2130A or P2130A SMA cable|
|Ripple and Noise||J2130A or P2130A SMA cable|
|Turn on overshoot||Scope with probe or SMA cable|
|PSRR||J2120A or J2111A and two voltage probes|
|Input Impedance||J2120A voltage and current probe|
|Bode Plot||J2100A or J2101A two voltage probes|
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