Post on 09-Mar-2021
transcript
CIRCUIT060010 CIRCUIT060010
General Purpose Amplifiers www.ti.com/general-amps
www.ti.com/circuitcookbooks
How to Design PWM generator circuit
CIRCUIT060010
www.ti.com/circuitcookbooks
Circuit Description
CIRCUIT060010
Input Output Supply ViMin ViMax VoMin VoMax Vcc Vee Vref
โ2.0 V 2.0 V 50mV 5 V 5 V 0 V 2.5 V
www.ti.com/circuitcookbooks
Design Steps
CIRCUIT060010
Input Output Supply ViMin ViMax VoMin VoMax Vcc Vee Vref
โ2.0 V 2.0 V 50mV 5 V 5 V 0 V 2.5 V
www.ti.com/circuitcookbooks
Design Steps
๐บ๐๐๐ = โ๐ 4
๐ 3= โ1๐/๐
๐ 3 = ๐ 4
๐๐_๐๐ = 1 +๐ 4
๐ 3ร
๐ 2
๐ 1 + ๐ 2ร ๐๐๐๐
๐ 1 = ๐ 2 = ๐ 3 = ๐ 4 = 10 ๐ฮฉ
CIRCUIT060010
Input Output Supply ViMin ViMax VoMin VoMax Vcc Vee Vref
โ2.0 V 2.0 V 50mV 5 V 5 V 0 V 2.5 V
www.ti.com/circuitcookbooks
Design Steps
๐๐ก๐๐ =๐ 5
๐ 6ร ๐1 = 2.1๐
๐ 5 =๐๐ก๐๐ ร ๐ 6
๐1=
2.1๐ ร 10๐ฮฉ
2.5๐= 8.42๐ฮฉ
8.42๐ฮฉ โ 8.45๐ฮฉ (๐๐ก๐๐๐๐๐๐ ๐๐๐๐ข๐)
CIRCUIT060010
Input Output Supply ViMin ViMax VoMin VoMax Vcc Vee Vref
โ2.0 V 2.0 V 50mV 5 V 5 V 0 V 2.5 V
www.ti.com/circuitcookbooks
Design Steps
๐๐ก =๐ 6
4 ร ๐ 7 ร ๐ 5 ร ๐ถ3
๐ 7 =๐ 6
4 ร ๐๐ก ร ๐ 5 ร ๐ถ3
๐ 7 =10๐ฮฉ
4 ร 500๐๐ป๐ง ร 8.45๐ฮฉ ร 100๐๐น= 5.92๐ฮฉ
5.92๐ฮฉ โ 5.9๐ฮฉ (๐๐ก๐๐๐๐๐๐ ๐๐๐๐ข๐)
CIRCUIT060010
Input Output Supply ViMin ViMax VoMin VoMax Vcc Vee Vref
โ2.0 V 2.0 V 50mV 5 V 5 V 0 V 2.5 V
www.ti.com/circuitcookbooks
Design Steps
๐๐ =1
2ฯ ร ๐ 4 ร ๐ถ1
๐ถ1 = 100๐๐น
๐๐ = 159๐๐ป๐ง
CIRCUIT060010
Input Output Supply ViMin ViMax VoMin VoMax Vcc Vee Vref
โ2.0 V 2.0 V 50mV 5 V 5 V 0 V 2.5 V
www.ti.com/circuitcookbooks
Design Steps
๐๐ =1
2ฯ ร ๐ถ2 ร๐ 1 ร ๐ 2๐ 1 + ๐ 2
๐ถ2 = 100๐๐น
๐๐ = 320๐ป๐ง
CIRCUIT060010
Input Output Supply ViMin ViMax VoMin VoMax Vcc Vee Vref
โ2.0 V 2.0 V 50mV 5 V 5 V 0 V 2.5 V
www.ti.com/circuitcookbooks
Transient Results
CIRCUIT060010
Input Output Supply ViMin ViMax VoMin VoMax Vcc Vee Vref
โ2.0 V 2.0 V 50mV 5 V 5 V 0 V 2.5 V
www.ti.com/circuitcookbooks
Design Notes
Design Notes: 1. For PWM generator circuits, use a
comparator with a push-pull output and
minimal propagation delay.
2. Select an op amp with sufficient SR, BW,
and output swing.
3. Place the pole created by C1 below the
switching frequency and well above the
audio frequency range.
CIRCUIT060010
Design Resources EE Cookbook: Op Amp
www.ti.com/circuitcookbooks
Step-by-step circuit design of common op amp building block circuits.
TI Designs
www.TI.com/tidesigns
Ready-to-use reference designs with
theory, calculations, simulations
schematics, PCB files, bench test results
Analog Engineerโs Pocket Reference
www.TI.com/analogrefguide
PDF, iTunes app and hardcopy available
PCB, analog, mixed signal design formulae
Conversions, tables, equations
TI Precision Labs
www.TI.com/precisionlabs
Quiz questions, problems, solutions
Labs and evaluation module (EVM) available
TINA-TIโข simulation software
www.TI.com/tool/tina-ti
Complete SPICE simulator DC, AC, transient, noise analysis
Schematic entry and post-processor for waveform math
DIYAMP-EVM
www.TI.com/DIYAMP-EVM
Evaluation module providing engineers with SC70, SOT23, SOIC packaging and
12 popular amplifier configurations
The Signal
www.TI.com/signalbook
PDF, iTunes app and hardcopy available
A compendium of blog posts on op amp design topics including
offset voltage, input bias current, stability, noise and more
Analog Wire Blog
www.TI.com/analogwire
Technical blogs written by analog experts
Tips, tricks, and design techniques
TI E2Eโข Community
www.TI.com/e2e
Support forums for all TI products
Op Amp Parametric Quick Search
www.TI.com/amplifiers
Search for precision, high-speed, general-purpose, ultra-low-power, audio and
power op amps
Op Amp Parametric Cross-Reference
www.TI.com/opampcrossreference
Find similar TI op amps using competitive part numbers
www.ti.com/circuitcookbooks
CIRCUIT060010 CIRCUIT060010
9