Zakładka z wyszukiwarką danych komponentów |
|
W_SERIES Arkusz danych(PDF) 5 Page - Copal Electronics |
|
W_SERIES Arkusz danych(HTML) 5 Page - Copal Electronics |
5 / 7 page BASIC CIRCUITRY METHOD AND FEATURES WHITE LED DRIVERS Designed for driving LEDs in series configuration High output voltage, high efficiency (over 80%) This will be explained by using W-52 as an example. It is composed of a PWM modulator for activating switch transistor SW and a oscillator which are inside the IC, as well as current sensor circuitry Current Control and error amplifier for detecting the current flowing through the LED and diode Over Voltage Protection for guarding against excessive voltage. It operates by setting the LED current (5mA to 40mA) to 225 times the current flowing through the RSET pin. An error signal travels to the PWM modulator so that the current flowing through the LED connected to the output equalizes with the set value, and the switching circuitry, comprised of an external inductor and switch transistor, varies within an ON/OFF range and regulates the (PWM) output current in order to provide a constant amount of current. In irregular circumstances, such as when the output ter minal is open, a diode guarding against excessive voltage will prevent the voltage from rising and protect the circuitry. ■ FEATURES ■ Circuitry structure and operation 1. Boost regulator Type [using coil] Vin C1 L1 1 6 Vin 5 SHDN SW D1 C2 3 LED SOT23 Pin Numbres Figure 1: W-52 Block Diagram ILED ILED= 225xIs Over Voltage Protection (22V) W-52 1.2MHz Oscillator PWM & Logic Current Control 100 mV 225x GND 2 ISRSET RSET Current Sense Amp + + – – |
Podobny numer części - W_SERIES |
|
Podobny opis - W_SERIES |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |