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UC1842 Datasheet(PDF) 21 Page - Texas Instruments

Part # UC1842
Description  Current-Mode PWM Controllers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UC1842 Datasheet(HTML) 21 Page - Texas Instruments

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COMP
VFB
UCx842
ISENSE
RT/CT
1
2
3
4
VREF
VCC
OUTPUT
GROUND
8
7
6
5
0.1 PF
R1
CRTCT
100
5
ISENSE
Adjust
1
E/A
Adjust
4.7
4.7
0.1 PF
GROUND
1
OUTPUT
VREF
VCC
Copyright © 2016, Texas Instruments Incorporated
21
UC1842, UC2842, UC3842, UC1843, UC2843, UC3843
UC1844, UC2844, UC3844, UC1845, UC2845, UC3845
www.ti.com
SLUS223D – APRIL 1997 – REVISED AUGUST 2016
Product Folder Links: UC1842 UC2842 UC3842 UC1843 UC2843 UC3843 UC1844 UC2844 UC3844 UC1845
UC2845 UC3845
Submit Documentation Feedback
Copyright © 1997–2016, Texas Instruments Incorporated
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The UCx84x controllers are peak current mode pulse width modulators. These controllers have an onboard
amplifier and can be used in isolated and non-isolated power supply design. There is an onboard totem pole gate
driver capable of delivering 1 A of peak current. This is a high-speed PWM capable of operating at switching
frequencies up to 500 kHz.
9.1.1 Open-Loop Test Fixture
The following application is an open-loop laboratory test fixture. This circuit demonstrates the setup and use of
the UCx84x devices and their internal circuitry.
In the open-loop laboratory test fixture (see Figure 24), high peak currents associated with loads necessitate
careful grounding techniques. Timing and bypass capacitors should be connected close to the GROUND terminal
in a single-point ground. The transistor and 5-kΩ potentiometer sample the oscillator waveform and apply an
adjustable ramp to the ISENSE terminal.
Figure 24. Open-Loop Laboratory Test Fixture
9.2 Typical Application
A typical application for the UC2842 in an off-line flyback converter is shown in Figure 25. The UC2842 uses an
inner current control loop that contains a small current sense resistor which senses the primary inductor current
ramp.
This current sense resistor transforms the inductor current waveform to a voltage signal that is input
directly into the primary side PWM comparator. This inner loop determines the response to input voltage
changes. An outer voltage control loop involves comparing a portion of the output voltage to a reference voltage


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