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| L6738單相降壓電源轉換解決方案 |
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| 文章來源： 更新時間：2014/6/23 10:14:00 |
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ST公司的L6738是集成了大電流驅動器的單相降壓電源控制器,VIN輸入電壓可低至1.5V,電源電壓從5V到12V,輕負載效率優化,集成了0.8V基準電壓,輸出電壓精度±0.5%,主要用在存儲器和終端電源,子系統電源(MCH, IOCH, PCI),CPU和DSP電源,分布式電源和通用DC/DC轉換器.本文介紹了L6738主要特性,框圖,典型應用電路以及評估板STEVAL-ISA075V1主要特性,電路圖和材料清單.
The L6738 is a single-phase step-down controller with integrated high-current drivers that provides complete control logic and protection to realize a DC-DC converter.
The device flexibility allows the management of conversions with power input VIN as low as 1.5 V and the device supply voltage ranging from 5 V to 12 V bus.
The L6738 features a proprietary algorithm that allows light-load efficiency optimization, boosting efficiency without compromising the output voltage ripple.
The integrated 0.8 V reference allows the generation of output voltages with ±0.5% accuracy over line and temperature variations.
The oscillator is programmable up to 600 kHz. The L6738 provides a programmable dual-level overcurrent protection and overvoltage protection. The current information is monitored across the inductor DCR.
The L6738 is available in a VFQFPN 16 3x3 mm package.
L6738主要特性:
■ Flexible power supply from 5 V to 12 V bus
■ Power conversion input as low as 1.5 V
■ Light-load efficiency optimization
■ Embedded bootstrap diode
■ VIN detector
■ 0.8 V internal reference
■ 0.5% output voltage accuracy
■ Remote GND recovery
■ High-current integrated drivers
■ Sensorless and programmable precise-OC sense across inductor DCR
■ OV protection
■ Programmable oscillator up to 600 kHz
■ LS-less to manage pre-bias startup
■ Adjustable output voltage
■ Disable function
■ Internal soft-start
■ VFQFPN 16 3x3 mm package
L6738應用:
■ Memory and termination supply
■ Subsystem power supply (MCH, IOCH, PCI)
■ CPU and DSP power supply
■ Distributed power supply
■ General DC-DC converter
圖1. L6738框圖
圖2. L6738快速保護的典型應用電路圖
圖3. L6738典型應用電路圖
評估板STEVAL-ISA075V1
High efficiency DC-DC converter - compact solution based on L6738
The STEVAL-ISA075V1 product evaluation board is a compact solution designed for testing the performance of the L6738.
The L6738 is a single-phase step-down controller with integrated high-current drivers that provides complete control logic and protection for DC-DC converters.
評估板STEVAL-ISA075V1主要特性:
Compact size (25.4 mm x 14.6 mm)
4 layers
VIN< 6 V
VOUTup to 3.5 V
IOUTup to 8 A (depending on VOUT)
FSW= 600 KHz
Dual power MOS option (2 x STL 3x3 or 1 x Dual SO8)
CIN= 2 x GRM21BR60J226ME39 (22 uF,6.3 V, 0805)
COUT= 2 or 3 x GRM31CC70G226KE01 (22 uF, 4 V, 1206)
Dual choke options (WE 744310095 or VITEC 59Px8970)
RoHS compliant
圖4. 評估板STEVAL-ISA075V1外形圖
圖5. 評估板STEVAL-ISA075V1電路圖
評估板STEVAL-ISA075V1材料清單:
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