поискавой системы для электроныых деталей |
|
LM3492Q датащи(PDF) 2 Page - Texas Instruments |
|
LM3492Q датащи(HTML) 2 Page - Texas Instruments |
2 / 24 page LM3492, LM3492Q SNVS656C – SEPTEMBER 2010 – REVISED MAY 2013 www.ti.com DESCRIPTION CONTINUED The fast slew rate current regulator allows high frequency and narrow pulse width dimming signals to achieve a very high contrast ratio of 1000:1 at a dimming frequency of more than 3 kHz. The LED current is programmable from 50 mA to 200 mA by a single resistor. To maximize the efficiency, Dynamic Headroom Control (DHC) automatically adjusts the output voltage to a minimum. DHC also facilitates a single BOM for different number of LED in a string, which is required for backlight panels of different size, thereby reducing overall development time and cost. The LM3492 comes with a versatile COMM pin which serves as a bi-directional I/O pin interfacing with an external MCU for the following functions: power-good, over-temperature, IOUT over- and under-voltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of the LM3492 include precise enable, VCC under-voltage lock-out, current regulator over-power protection, and thermal shutdown protection. The LM3492 is available in the thermally enhanced 20-pin HTSSOP package. CONNECTION DIAGRAM Figure 1. 20-Pin HTSSOP (Top View) See PWP0020A Package PIN DESCRIPTIONS Pin Name Description Application Information 1 EN Enable Internally pull-up. Connect to a voltage higher than 1.63V to provide precision enable for the device. 2 VIN Input Supply Voltage Supply pin to the device. Input range is 4.5V to 65V. 3, 4 SW Switch Node Internally connected to the drain of the integrated MOSFET. 5 VOUT Output Voltage Sense Sense the output voltage for nearly constant switching frequency control. 6 RT Frequency Control An external resistor from the VOUT pin to this pin sets the switching frequency. 7 FB Output Voltage Feedback The output voltage is connected to this pin through a feedback resistor divider for output voltage regulation. The voltage of this pin is from 1.05V to 2.5V. 8 GND Analog Ground Signal Ground 9 IOUT2 Current Regulator Input of Channel 2 Input of the current regulator of channel 2. The regulated current is programmable (refer to the IREF pin). 10 IOUT1 Current Regulator Input of Channel 1 Input of the current regulator of channel 1. The regulated current is programmable (refer to the IREF pin). 11 CDHC Dynamic Headroom Control An external capacitor connected to this pin sets the DHC sensitivity. At startup, a 120 µA internal current source charges an external capacitor to provide a soft-start function. 12 IREF Current Setting of the Current Regulator An external resistor connected from this pin to ground programs the regulated current of the current regulator of channels 1 and 2. 13 COMM Bi-directional Logic Communication This pin is open drain for various indications (power-good, over- temperature, IOUT over- and under-voltage) and command sending (switching frequency tuning and channel 1 disabling). 2 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: LM3492 LM3492Q |
Аналогичный номер детали - LM3492Q |
|
Аналогичное описание - LM3492Q |
|
|
ссылки URL |
Конфиденциальность |
ALLDATASHEETRU.COM |
Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | обмен ссыками | поиск по производителю 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 |