CPU Current Mode
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Frequency compensation
In electrical engineering, frequency compensation is a technique used in amplifiers, and especially in amplifiers employing negative feedback. It usually has two primary goals: To avoid the unintentional creation of positive feedback, which will cause the amplifier to oscillate To control overshoot and ringing in the amplifier's step response.
- ON-SEMI AND8334/D Understanding Loop Compensation with Monolithic Switchers
- Intersil Designing Stable Compensation Networks for Single Phase Voltage Mode Buck Regulators
- TYPE III CALCULATOR
- EE136 STABILITY AND CONTROL LOOP COMPENSATION IN SWITCH MODE POWER SUPPLY Huyen Tran
- IR AN-1162 Compensator Design Procedure for Buck Converter with Voltage-Mode Error-Amplifier
- Optimizing Low-Power DC/DC Designs –External versus Internal Compensation by Michael Day
Type II
- EXAR Loop compensation of voltage-mode boost converters in dataweek-magazine
- Abraham Pressman, Switching Power Supply Design(McGraw-Hill Inc., 1991)
- IR AN-1043 Stabilize the Buck Converter with Transconductance Amplifier
- Type II is PI
- Type III is PID
Type III
Average current mode control
- U-140 Unitrode application note Dixon 1990 from colorado.edu]
- Unitrode application note Dixon 1990 from TI
- slup098 Control Loop Design by Dixon
- SLUP113A Control Loop Cookbook Lloyd H. Dixon
- All Unitrode literature
- [1]
- http://www.ti.com/lit/an/slua126/slua126.pdf
Freescale
STM
- Used in L297, L6506
- AN460 (March 1992) Thomas L. Hopkins STEPPER MOTOR DRIVER CONSIDERATIONS COMMON PROBLEMS & SOLUTIONS
page 9/11: The second solution is to use the inherent set dominance of the internal flip-flop in the L297 or L6506 [1][3] to mask out the spike. To do this the width of the oscillator sync pulse is set to be longer than the sum of the propagation delay (typically 2 to 3µ s for the L298N) plus the duration of the spike (usually in the range of 100ns for acceptable fast recovery diodes), as shown in figure 12. When this pulse is applied to the flip-flop set input, any signal applied to the reset input by the comparator is ignored. After the set input has been removed the comparator can properly reset the flip-flop at the correct point. The corresponding solution in frequency modulated circuits, is to fix a blanking time during which the monostable may not be re-triggered.
- SET is Dominant
Microchip MCP1630
- Microchip MCP1630 microcontroller attachable current mode PWM 8-PINS
- TB085 A Simple Circuit for Driving Microcontroller Friendly PWM Generators
- at digikey
1 $1.33000 100 $0.82000
NiMH BATTERY CHARGER
- NiMH battery charger below is controlling the battery current with the error amplifier. This is the main control loop
- Loop compensation only with a capacitor, simpler than Voltage control loop.
- The max current of the Mosfet is controlled from the current sense input.
- Discrete Sawtooth Oscillators
- sawtooth-generator-oscillator-with-transistors
- simple sawtooth
- simple sawtooth with details
- http://www.electronic-circuits-diagrams.com/oscillatorsimages/oscillatorsckt2.shtml
*Error Amplifier is connected to PWM-comparator. **CS is the sawtooth signal produced from the charging of the Inductor **If there is NO Inductor a sawtooth should be applied to CS pin
- RESET is Dominant
Flip Flop
- CD4013 NXP datasheet
| ClOCK | DATA | SET | RESET | Q |
| 0 | 0 | 0 | 0 | Q(n-1) |
| 0 | 0 | 0 | 1 | 0 |
| 0 | 0 | 1 | 0 | 1 |
| 0 | 0 | 1 | 1 | 1 |
- By keeping CLOCK and DATA to LOW: SET is dominant, 00=NoChange
TI
- U-93 U1846 A NEW INTEGRATED CIRCUIT FOR CURRENT MODE CONTROL
- UC2846 product page
- Power IC Model Library from EMA Design Automation
- With 400 power devices
- UC1846 Gate Drive Circuit and Voltage Doublers, EMA Design Automation
- Robert Mammano father of SG1524, Silicon General, Unitrode, TI
File:UC1846-3.jpg File:UC1846-4.jpg
