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ST1938 bảng dữ liệu(PDF) 1 Page - Stanson Technology

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Giải thích chi tiết về linh kiện  DC-DC Step-Up Converter for White LED Driver
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ST1938
DC-DC Step-Up Converter for White LED Driver
STANSON TECHNOLOGY
120 Bentley Square, Mountain View, Ca 94040 USA
www.stansontech.com
ST1938 2008. V1
DESCRIPTION
The ST1938 is a step-up DC/DC converter for white LED driver with over voltage protection.
The device can driver one to four LEDs in series from a single cell Lithium Ion battery.
Internal functions include current limiting; thermal shutdown; OVP and soft-start to prevent
damage operate status. The ST1938 operates at 0.8MHz and from low input voltages as low as
1.5V; apply to Lithium-Ion powered systems. A low 95mV reference voltage minimizes power
loss in the current setting resistor for better efficiency.
The ST1938 is available in small package SOT-23-6L
PIN CONFIGURATION
SOT23-6L
PART MARKING
APPLICATIONS
Battery Power Equipment
Notebook Computers
PDA
Cellular Phone
FEATURES
Current Source with Over Voltage
Protection
Fast 0.8MHz Switching Frequency
High Efficiency up to 87%
Drives up to Four LEDs From 3.2V
Supply
Drives up to Six LEDs From a 5V Supply
Low Quiescent Current
Disconnects LEDs in Shutdown Mode
Internal Over Temperature and Current
Limiting Shutdown Function
Internal Soft-Start Circuit
36V Rugged Bipolar Switch
Available in a Small SOT-23-6L Package


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