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부품번호 | TD8201 기능 |
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기능 | White LED Step-up Converter | ||
제조업체 | Techcode | ||
로고 | |||
전체 11 페이지수
T echcode®
White LED Step-up Converter
DATASHEET
TD8201
General Description
Features
The TD8201 is a step‐up DC/DC converter designed for driving z Drives Up to 5 Series White LEDs from 3V
up to 5 white LEDs in series from a single cell Lithium Ion z Up to 87% Efficiency
battery with constant current. Because it directly regulates z 1.25MHz Fixed Switching Frequency
output current, the TD8201 is ideal for driving light
z Low 104mV Feedback Voltage
emitting diodes (LEDs) whose light intensity is z Open Load Shutdown
proportional to the current passing through them, not the z PWM Dimming
voltage across their terminals. A single external resistor sets z SOT23‐6 Packages
LED current between 2mA and 20mA, which can then be z RoHS compliant
easily adjusted using either a DC voltage or a pulse width
modulated (PWM) signal up to 100KHz. Its low
104mV feedback voltage reduces power loss and
Applications
improves efficiency. The OV pin monitors the output
voltage and turns off the converter if an
over‐voltage condition is present due to an open circuit
condition. The TD8201 is available in SOT23‐6 packages.
z Cell Phones
z Handheld Computers and PDAs
z Digital Cameras
z Small LCD Displays
December, 20, 2011 Techcode Semiconductor Limited www.techcodesemi.com
1
T echcode®
White LED Step-up Converter
Absolute Maximum Ratings
Symbol
Parameter
VIN
VSW
VIO
PDMAX
PTR1
Tstg
Tsolder
Input Voltage
Voltage at SW Pin
All Other I/O Pins
Power Dissipation (Note 2)
Thermal Resistance,SOT‐23‐6, ΘJA
Storage Temperature
Package Lead Soldering Temperature
ESD Susceptibility (Note 3)
Recommended Operating Conditions
Symbol
VIN VIN Supply Voltage
VSW Output Voltage
TOPT Operating Temperature
Parameter
DATASHEET
TD8201
Rating
‐0.3~6
‐0.5~25
GND‐0.3 to VDD+0.3
Internally Limited
220
‐55 to 150
260℃, 10s
3
Unit
V
V
V
W
℃/W
℃
kV
Range
3 to 5.5
VIN to 20
‐40 to +85
Unit
V
V
℃
December, 20, 2011 Techcode Semiconductor Limited www.techcodesemi.com
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4페이지 T echcode®
White LED Step-up Converter
Typical Application Circuit
DATASHEET
TD8201
OPERATION DESCRIPTION
The TD8201 uses a constant frequency, peak current mode boost regulator architecture to regulate the series string of
white LEDs. The operation of the TD8201can be understood by referring to the simplified block diagram
shown above. At the start of each oscillator cycle, the control logic turns on the power switch M1. The signal at the
non‐inverting input of the PWM comparator is proportional to the switch current, summed
together with a portion of the oscillator ramp When this signal reaches the level set by the output of error amplifier, the
PWM comparator resets the latch in the control logic and turns off the power switch. In this manner, error amplifier sets
the correct peak current level to keep the LED current in regulation. If the feedback voltage starts to drop,
the output of the error amplifier increases. This results in more current to flow through M1, hence increasing the power
delivered to the output.
December, 20, 2011 Techcode Semiconductor Limited www.techcodesemi.com
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다운로드 | [ TD8201.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
TD8201 | White LED Step-up Converter | Techcode |
TD8202 | Step-Up Converter | Techcode |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |