这一章介绍峰值电流模控制占空比duty ratio. 也叫current-programmed mode (CPM) 或者 peak current mode (PCM) control. CPM不直接控制duty ratio d(t), 而是通过限制开关管的峰值电流. 控制信号是电流ic(t), 占空比duty ratio d(t)包括电感电流和输出电压取决于ic(t). ic(t)的来源是输出电压和基准Vref经...
An improved model is provide for current mode step-down controllers that more accurately predicts phase margin compared to previous first-order models.
In a current mode control, the output of the voltage loop provides a command reference for the operation of the current loop. In a closed loop operation, the current loop can be visualized as a mechanism that provides a constant gain between the sensed current and the commanded current. To ...
1 UNDERSTANDING AND APPLYING CURRENT-MODE CONTROL THEORY by Robert Sheehan Current-Mode Operation Whether the current-mode converter is peak, valley, average, or sample-and-hold is secondary to the operation of the current loop. As long as the dc current is sampled, current-mode operation is ...
I decided to choose open-loop peak current mode control, which has simple circuit. Open-loop structure is easy to design, and stable. Microchip’s HV9910B and Diodes AL9910/A are similar open-loop peak current mode controller. They have the same internal circuit and the same pin out, and...
CURRENT-MODE CONTROL Figure 1 shows the two-loop current-mode control system in a typical buck regulator application. A clock signal initi- ates power pulses at a fixed frequency. The termination of each pulse occurs when an analog of the inductor current reaches a threshold established by the...
By the mathematical interpretation of a practical sampler representing the sampling effect of a current control loop, the small signal models of an average current mode control can be easily derived. The instability of the current control loop, which gives rise to the subharmonic oscillation, can ...
Current-mode control (CMC) is an extremely popular dc-dc converter loop architecture —and with good reason. Simple operation and dynamics are achieved even though two loops, a wide-bandwidth current loop lurking inside an outer voltage loop, are required. Peak, valley, average, hysteretic, ...
implementoff-lineorDCtoDCfixedfrequencycurrentmodecontrolschemes withaminimalexternalpartscount.Internallyimplementedcircuitsinclude under-voltagelockoutfeaturingstartupcurrentlessthan1mA,aprecision referencetrimmedforaccuracyattheerrorampinput,logictoinsurelatched operation,aPWMcomparatorwhichalsoprovidescurrentlimitcontrol,...
This example shows how to use the Comparator Subsystem (CMPSS) to regulate buck converter output voltage (BOOSTXL-BUCKCONV) using Peak Current Mode Control (PCMC) for Texas Instruments™ C2000™ Microcontroller Blockset. Using this example, you can:...