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UC3843ANG4 Datasheet(PDF) 12 Page - Texas Instruments |
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UC3843ANG4 Datasheet(HTML) 12 Page - Texas Instruments |
12 / 45 page 12 UC1842A, UC1843A, UC1844A, UC1845A UC2842A, UC2843A, UC2844A, UC2845A UC3842A, UC3843A, UC3844A, UC3845A SLUS224E – SEPTEMBER 1994 – REVISED JULY 2016 www.ti.com Product Folder Links: UC1842A UC1843A UC1844A UC1845A UC2842A UC2843A UC2844A UC2845A UC3842A UC3843A UC3844A UC3845A Submit Documentation Feedback Copyright © 1994–2016, Texas Instruments Incorporated Feature Description (continued) Precision operation at high frequencies with an accurate maximum duty cycle, see Figure 7, can now be obtained with the UCx84xA family of devices due to its trimmed oscillator discharge current. This nullifies the effects of production variations in the initial discharge current or dead time. Previous versions of the UCx84x devices had greater than a 2:1 oscillator discharge current range and resulted in less reliable maximum duty cycle programming. A fraction of the oscillator ramp can be resistively summed with the current sense signal, to provide slope compensation for converters requiring duty cycles over 50%. Capacitor C forms a filter with R2 to suppress the leading-edge switch spikes. 8.4 Device Functional Modes 8.4.1 Normal Operation The IC can be used in peak current mode (PCM) control or voltage mode (VM) control. When the converter is operating in PCM, the voltage amplifier output will regulate the converter's peak current and duty cycle. When the IC is used in VM control, the voltage amplifier output will regulate the power converter's duty cycle. The regulation of the system's peak current and duty cycle can be achieved with the use of the integrated error amplifier and external feedback circuitry. 8.4.2 Undervoltage Lockout (UVLO) Start-Up During system start-up, VCC voltage starts to rise from 0. Before the VCC voltage reaches its corresponding start threshold, the IC is operating in UVLO mode. After the UVLO turn start-up threshold is met the device will become active and the reference will come up to 5 V. 8.4.3 UVLO Turnoff Mode If the bias voltage to VCC drops below the UVLO minimum operating voltage, PWM switching stops and the reference will become inactive, returning to 0 V. The device can be restarted by applying a voltage greater than the UVLO start threshold to the VCC pin. |
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