The LM3554 uses the National Semiconductor LM3554 chip's entire LED flash boost converter solution to be very compact and no larger than 23mm2. The chip is available in a 16-pin microSMD package. In addition, this chip has a monitoring pin, which can detect whether other circuits of the system are consuming a large amount of current, and flexibly adjust the current of the LED when necessary, so as to avoid excessive power consumption of the battery and cause the system to malfunction or be damaged. . Since the brightness output of the LED has a nonlinear relationship with the LED current, even with the same amount of light output, the power consumption of the dual LED architecture is still lower than that of the one LED.
The LM3554 flash LED driver is a fixed frequency step-up DC/DC converter featuring two stable current sources that can drive up to 1.2A with a single Li-Ion battery. The LM3554 can use a high-power flash mode to support camera functions, or a low-power flashlight mode to support video recording.
The LM3554 has an adjustable switch current limit that allows the system to use small inductors with low saturation current. The chip provides a 5V power supply to drive the LED backlight and power the audio amplifier. Engineers can use an internal scratchpad or external control pin (Strobe orTorch) to drive 1 or 2 high-current LEDs in high-power flash mode or low-power flashlight mode.
In addition, the system can also independently control the related hardware through the general-purpose input/output (GPIO) pin, so that the I2C interface can fully control the operation of the chip in the event of communication problems. The chip also has an internal soft-start function that suppresses a large amount of surge current during startup and high-frequency switching, allowing the system to use small external components.
The conventional flash LED driver uses a current recovery method to recover the current that drives the high current LED, that is, all current is returned to the driver, causing the driver to generate a large amount of heat, so that the reliability of the system is also affected. The LM3554 uses a dual LED HighSide current drive architecture to provide stable drive current for both LEDs. The cathode of the LED is directly grounded. This grounded design not only enhances heat dissipation, but also simplifies wiring and protects sensitive circuits.
Medical Device speaker:
Medical Device speaker is a kind of micro speaker unit which uses a diaphragm made of Mylar material. Mylar speakers are of ultrathin design and lightweight and clear voice. It is widely used in medical devices (sphygmomanometer, glucometer, fetus-voice meter-) .
There are two types of Mylar speakers from the shapes:
1) Round shapes, we have products from 10mm to 57mm in diameter.
2) Oblong shape, we have products in sizes of 1510/1712/1813-..
FAQ
Q1. What is the MOQ?
XDEC: 2000pcs for one model.
Q2. What is the delivery lead time?
XDEC: 15 days for normal orders, 10 days for urgent orders.
Q3. What are the payment methods?
XDEC: T/T, PayPal, Western Union, Money Gram.
Q4. Can you offer samples for testing?
XDEC: Yes, we offer free samples.
Q5. How soon can you send samples?
XDEC: We can send samples in 3-5 days.
Sphygmomanometer Speaker,Fetus-Voice Meter Speaker,Glucometer Speaker,Blood Pressure Monitor Speaker
Shenzhen Xuanda Electronics Co., Ltd. , https://www.xdecspeaker.com