车用影音及GPS技术发展与应用

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文字介绍	The SC4524A is a constant frequency peak current-mode step-down switching regulator capable of producing 2A output current from an input ranging from 3V to 28V. The switching frequency of the SC4524A is programmable up to 2MHz, allowing the use of small inductors and ceramic capacitors for miniaturization, and high input/ output conversion ratio. The SC4524A is suitable for next generation XDSL modems, high-definition TVs and various point of load applications. Peak current-mode PWM control employed in the SC4524A achieves fast transient response with simple loop compensation. Cycle-by-cycle current limiting and hiccup overload protection reduces power dissipation during output overload. Soft-start function reduces input start- up current and prevents the output from overshooting during power-up. The SC4524A is available in SOIC-8 EDP package
我要联络诠鼎集团中国 SEMTECH 产品线人员

【SEMTECH - SC4525A (PWM for Car Media)】

产品规格

• Wide input range: 8V to 28V
• 3A Output Current
• 200kHz to 2MHz Programmable Frequency
• Precision 1V Feedback Voltage

产品特性

• Peak Current-Mode Control
• Cycle-by-Cycle Current Limiting
• Hiccup Overload Protection with Frequency Foldback
• Soft-Start and Enable
• Thermal Shutdown
• Thermally Enhanced 8-pin SOIC Package
• Fully RoHS and WEEE compliant

产品应用

• XDSL and Cable Modems
• Set Top Boxes
• Point of Load Applications
• CPE Equipment
• DSP Power Supplies
• LCD and Plasma TVs

文字介绍

The SC4525A is a constant frequency peak current-mode step-down switching regulator capable of producing 3A output current from an input ranging from 8V to 28V. The switching frequency of the SC4525A is programmable up to 2MHz, allowing the use of small inductors and ceramic capacitors for miniaturization, and high input/ output conversion ratio. The SC4525A is suitable for next generation XDSL modems, high-definition TVs and various point of load applications.

Peak current-mode PWM control employed in the SC4525A achieves fast transient response with simple loop compensation. Cycle-by-cycle current limiting and hiccup overload protection reduces power dissipation during output overload. Soft-start function reduces input start- up current and prevents the output from overshooting during power-up.

The SC4525A is available in SOIC-8 EDP package.

我要联络诠鼎集团中国 SEMTECH 产品线人员

【SEMTECH - SC4538 (LED driver for GPS)】

产品规格

• Input voltage range — 2.8V to 5.5V
• Current-mode PWM control — 800kHz
• Programmable LED current up to 30mA
• Soft-start to reduce in-rush current
• PWM dimming — 100Hz to 50kHz
• Analog and filtered-PWM dimming at ISET

产品特性

• Over-voltage protection — 38V (min.)
• Under-voltage lockout (UVLO)
• Thermal shutdown
• Shutdown current — <1μA
• Ultra-thin package — 2mm x 2mm x 0.6mm
• Lead-free package, WEEE and RoHS compliant

产品应用

• White LED Display Backlight Driver
• Smartphones and PDAs
• Cellular Handsets
• MP3 and Portable Media Players
• DSC, GPS, Satellite Radio, Game Players

文字介绍

The SC4538 is designed to regulate current for a series chain of white LEDs in LCD backlighting applications where small size and high efficiency are priorities. This device integrates an 800kHz current-mode PWM boost converter and a 30mA programmable low dropout current sink regulator.

An external resistor sets the LED current up to 30mA. PWM dimming (100Hz to 50kHz) may be applied directly to the enable (EN) pin, or dimming can be controlled by applying an analog signal to the ISET circuit. The SC4538 drives a string of up to 10 white LEDs with a forward voltage of 3.8V or less. The current regulator protects against shorts between the BL and OUT pins and also eliminates backlight glow during shutdown when using LEDs with high leakage. Under-voltage lockout and thermal shutdown provide additional protection. A small external capacitor and series resistor control soft-start and loop compensation. Over-voltage detection protects the SC4538 if the LED pin is floating or shorted to ground.

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