7.2 Functional Block Diagram Unregulated DC Input CIN VIN 1 + 4 Feedback R2 Fixed Gain Error Amp + R1 ± 1k Internal Rgulator Comparator + ± ON/OFF 3 Amp Switch Driver 1.23 V BAND-GAP REFERENCE 52 kHZ OSCILLATOR RESET THERMAL SHUTDOWN CURRENT LIMIT ON/OFF 5 OUTPUT 2 L1 D1 3 GND ...
Enough inductor current ripple improves signal-to-noise ratio on the current comparator and makes the control loop more immune to noise. Once the inductance is determined, the type of inductor must be selected. Ferrite designs have very low core losses and are preferable at high switching ...
Current comparator bridge417–9 Current density312 D Damped capacitor voltage divider162–4 Damping resistors32 D.C. cascade circuit with transformers21 D.C. corona inception and breakdown in air204 Deionization302 Deltatron22 Dielectric loss411 Dielectric polarization396 Dielectric refraction232–3 Dielec...
Internally, the pin connects a comparator that, when the voltage on the pin exceeds 1.85 V, shuts the IC down and brings its 8 DIS consumption almost to a "before startup" level. The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to ...
To see how this translates in real life, see the following video below. Related Resources How to Use the LM741 Op Amp as a Comparator How to Build an LM339 Quad Voltage Comparator Circuit How to Build a Dark-activated Switch How to Build a Hall Effect Sensor Circuit ...
The output of the comparator is high when the control voltage is larger than the RC ramp voltage. Therefore, to achieve a 100% duty cycle the control voltage needs to be equal to the maximum RC ramp height. This is typically internal to many analog ICs and the implementation differs in ...
When the voltage of the selected source goes above its UVLO level (VVBUS > VVBUS_UVLOZ or VBAT > VBAT_UVLOZ), a POR happens and activates the sleep comparator, battery depletion comparator and BATFET driver. Upon activation, the I2C interface will also be ready for communication and all ...
If a fixed voltage source is connected to the external AREF pin, the application may not use the other reference voltage options in the application, as they will be shorted to the external voltage. If no external voltage is applied to the AREF pin, you may switch between AVCC and 1.1 V...
95 150 mΩ RDS_ON_LS (3) Low-side MOSFET on- resistance IOUT = 1 A, VBIAS = VOUT = 3.3 V 45 85 mΩ THERMAL SHUTDOWN TSD (4) Thermal shutdown threshold Shutdown threshold Recovery threshold 160 °C 135 (2) This current limit was measured as the internal comparator trip point...
In PFM after a On cycle the system turns-on the low side MOSFET until the inductor current goes down zero, when the zero-crossing comparator turns off the low side MOSFET. In PWM mode, after On cycle, the system keeps the low side MOSFET on until the...