UC3863G-S08-R datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > Power/power management> The power supply circuit> UC3863G-S08-R

UC3863G-S08-R: DescriptionLOW COST POWER-SAVING MODE PWM CONTROLLER; CategoryPower/power management The power supply circuit; File Size375KB，11 Pages; ManufacturerUNISONIC TECHNOLOGIES CO.,LTD; Websitehttp://www.unisonic.com.tw/; Environmental Compliance

Download Datasheet Parametric Compare View All

UC3863G-S08-R Overview

LOW COST POWER-SAVING MODE PWM CONTROLLER

UC3863G-S08-R Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	UNISONIC TECHNOLOGIES CO.,LTD
package instruction	,
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
Base Number Matches	1

Preview

Download Datasheet

View All

UNISONIC TECHNOLOGIES CO., LTD

UC3863

LOW COST POWER-SAVING

MODE PWM CONTROLLER

FOR FLYBACK CONVERTERS



DESCRIPTION

LINEAR INTEGRATED CIRCUIT

The

UC3863

is a high performance current mode PWM

controller ideally suited for low standby power. The PWM switching

frequency is programmable externally at normal operation. Low

startup current make the power reliable on startup design and

a large value resistor could be used in the startup circuit to

minimize the standby power. At no load condition, the IC operates

in power-saving mode for lower standby power, decreasing

frequency for Higher conversion efficiency at light load condition.

The

UC3863

contains protection with automatic recovery

including OLP (over load protection), OTP (over temperature

protection), OVP (over voltage protection), UVLO (V

over voltage clamp and under voltage lockout).To protect

the power MOSFET, Gate-drive output is fixed up to 15V max. The

UC3863

contains protection OCP (cycle-by-cycle

current limiting).

The internal slope compensation improves system stability at high PWM duty cycle output. Leading-edge

blanking on current sense input removes the signal glitch, which offering minimal external component count in the

design. Excellent EMI performance is achieved with UTC proprietary frequency hopping technique

(ZL201020615247.1) together with soft driver control. Audio noise is eliminated due to switch frequency more than

20kHz during operation.

The

UC3863

has such applications as: battery charger, power adaptor, set-top box power supplies, ink jet

printers, open-frame SMPS



FEATURES

* Programmable PWM Frequency

* Gate output voltage clamped at 15V

* Low start-up current

* Cycle-by-cycle Current Limiting

* Under voltage lockout (UVLO)

* Few external components required

* UTC proprietary frequency hopping technology for Improved EMI

performance.

* Power-saving mode for high light-load and standby efficiency

* Dynamic peak current limiting for constant output power

* Built-in synchronized slope compensation

* OTP,OLP,OVP and V

clamp for higher security



ORDERING INFORMATION

Ordering Number

Lead Free

UC3863L-D08-T

Halogen Free

UC3863G-AG6-R

UC3863G-D08-T

UC3863G-S08-R

Package

SOT-26

DIP-8

SOP-8

Packing

Tape Reel

Tube

Tape Reel

www.unisonic.com.tw

1 of 10

QW-R103-058.F

UC3863



OPERATION DESCRIPTION

LINEAR INTEGRATED CIRCUIT

The

UC3863

devices integrate many useful designs into one controller for low-power switch-mode power

supplies. The following descriptions highlight some of the features of the

UC3863

series.

Start-up Current

The start-up current is only 5μA. Low start-up current allows a start-up resistor with a high resistance and a

low-wattage to supply the start-up power for the controller. For AC/DC adaptor with universal input range design, a

2.5~3MΩ, 1/8W startup resistor could be used together with a V

capacitor to provide a fast startup and low power

dissipation solution.

Power-Saving Mode Operation

The proprietary Power-Saving Mode function provides linearly decreasing the switching frequency under

light-load conditions for higher efficiency. The feedback voltage, which is sampled from the voltage feedback loop, is

taken as the reference. Once the feedback voltage dropped below the threshold voltage, the switching frequency

starts to decrease. This Power-Saving Mode function dramatically reduces power consumption under light-load

conditions. The 22KHz minimum frequency control also eliminates the audio noise at any loading conditions.

At zero load condition, the magnitude of power loss is in proportion to the number of switching events within a

fixed period of time. Reducing switching events leads to the reduction on the power loss and thus conserves the

energy. The

UC3863

enter burst mode at standby condition to minimize the switching loss and reduces the standby

power consumption. Power supplies using the

UC3863

can easily meet even the strictest regulations regarding

standby power consumption.

Switch Frequency Set

The maximum switch frequency is set through the 100KΩ RI-pin resistor to 65KHz. Switch frequency is

modulated by output power P

OUT

during IC operating. At no load or light load condition, most of the power dissipation

in a switching mode power supply is from switching loss on the MOSFET transistor, the core loss of the transformer

and the loss on the snubber circuit. The magnitude of power loss is in proportion to the number of switching events

within a fixed period of time. So lower switch frequency at lower load, which more and more improve IC’s efficiency

at light load. At from no load to light load condition, The IC will operate at from Burst mode to Reducing Frequency

Mode. The relation curve between f

and P

OUT

OUT (MAX)

as followed Fig.1. The maximum switch frequency is set

through the RI-pin resistor RI: F

=6500/RI (KΩ) KHz.

Fig.1 The relation curve between f

and relative output power P

OUT

/ P

OUT (MAX)

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

5 of 10

QW-R103-058.F

UC3863G-S08-R Related Products

	UC3863G-S08-R	UC3863G-AG6-R	UC3863G-D08-T	UC3863L-D08-T	UC3863_15
Description	LOW COST POWER-SAVING MODE PWM CONTROLLER	LOW COST POWER-SAVING MODE PWM CONTROLLER	LOW COST POWER-SAVING MODE PWM CONTROLLER	LOW COST POWER-SAVING MODE PWM CONTROLLER	LOW COST POWER-SAVING MODE PWM CONTROLLER
Maker	UNISONIC TECHNOLOGIES CO.,LTD	UNISONIC TECHNOLOGIES CO.,LTD	UNISONIC TECHNOLOGIES CO.,LTD	UNISONIC TECHNOLOGIES CO.,LTD	-
Reach Compliance Code	compliant	compliant	unknown	unknown	-
ECCN code	EAR99	EAR99	EAR99	EAR99	-
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	-
Base Number Matches	1	1	1	1	-

Recommended Resources

Typical application diagram of KJ004-wiring diagram and waveform diagram

Digitally Tuned Low Power Filter

CWDQX-101 dishwasher program controller control circuit diagram

Sounding on and off tester

Series DC motor knife switch reversible control

My message to the Goodwill Ambassadors...: Dear Goodwill Ambassador:Hello!As a moderator of the MCU section and the Power Management section of the World of Electronic Engineering Forum, I would like to express my highest respect to you first....; 破茧佼龙 Suggestions & Announcements

MXCHIP-open1081-Wifi_Link test: WifiLink@open1081 is the first program in the test routine. Today I took a look at the program, and then burned it into the board and tried it. The serial port print information is basically consisten...; muxb RF/Wirelessly

The blog contest is about to start! I hope everyone will support me! Getting ready for the contest, yeah!: Hello everyone! I am jxb01033016, my blog is open! I hope you will give me more praise!! Come on and cheer for eeworld blog! Yeah! The following are all my personal works, I hope you like them! Stick ...; jxb01033016 Embedded System

Switching Power Supply Primer: Resource address: [url=https://download.eeworld.com.cn/detail/okhxyyo/558357]https://download.eeworld.com.cn/detail/okhxyyo/558357[/url] Book recommendation: "Introduction to Switching Power Supply"...; okhxyyo Power technology

Process defects in printed circuit board PCB design: 1. Overlap of pads 1. Overlap of pads (except surface mount pads) means overlap of holes. In the drilling process, multiple drillings in one place may cause the drill bit to break, resulting in damage...; ESD技术咨询 PCB Design

Can't find the target microcontroller, please give me some advice, thank you: The circuit diagram is shown in the first two figures. After clicking "Check MCU Options" or "Download/Program", it will display "Checking target MCU" all the time, as shown in the figure below: I tri...; wg2993 51mcu

Shortcut: 00 01 02 03 04 05 06 07 08 09 0A 0C 0F 0J 0L 0M 0R 0S 0T 0Z 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1H 1K 1M 1N 1P 1S 1T 1V 1X 1Z 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 2G 2K 2M 2N 2P 2Q 2R 2S 2T 2W 2Z 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 3G 3H 3J 3K 3L 3M 3N 3P 3R 3S 3T 3V 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4M 4N 4P 4S 4T 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5E 5G 5H 5K 5M 5N 5P 5S 5T 5V 60 61 62 63 64 65 66 67 68 69 6A 6C 6E 6F 6M 6N 6P 6R 6S 6T 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7M 7N 7P 7Q 7V 7W 7X 80 81 82 83 84 85 86 87 88 89 8A 8D 8E 8L 8N 8P 8S 8T 8W 8Y 8Z 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9F 9G 9H 9L 9S 9T 9W

Popular Components