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UC3843ANG4 Datasheet(PDF) 12 Page - Texas Instruments

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Part # UC3843ANG4
Description  Current-Mode PWM Controller
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UC3843ANG4 Datasheet(HTML) 12 Page - Texas Instruments

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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
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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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