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TS1937 データシート(PDF) 1 Page - Taiwan Semiconductor Company, Ltd

部品番号 TS1937
部品情報  Boost (Step-up) WLED Driver
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メーカー  TSC [Taiwan Semiconductor Company, Ltd]
ホームページ  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS1937 データシート(HTML) 1 Page - Taiwan Semiconductor Company, Ltd

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TS1937
Boost (Step-up) WLED Driver
1/8
Version: C07
SOT-25
General Description
The TS1937 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The
device can drive 2 ~ 12 LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED
currents resulting in uniform brightness and eliminating the need for ballast resistors. The output capacitor can be as
small as 0.22µF, saving space versus alternative solutions. A low 95mV feedback voltage minimizes power loss for
better efficiency. Additional feature include over output voltage limiting when LEDs are disconnected.
The TS1937 switches at a fixed frequency of 1.2MHz, allowing the use of tiny, low profile inductors and capacitors to
minimize footprint and cost in space consideration applications for cellular phone backlighting or other hand held
equipment.
Application
Cellular Phones
Digital Still Cameras
MP3 Players
White LED Backlighting
PDAs, Handheld computers
Features
Inherently Matched LED Current
High Efficiency: 88% Typical
Drives Up to 6 LEDs @ Vin 5V
Drives Up to 12 LEDs @ Vin 12~15V
36V Rugged Bipolar Switch
Fast 1.2MHz Switching Frequency
Requires Only 0.22µF Output Capacitor
PWM dimming control 1KHz to 10KHz
Analog dimming control
Ordering Information
Part No.
Package
Packing
TS1937CX5 RF
SOT-25
3Kpcs / 7” Reel
Typical Application Circuit
Pin Definition:
1. SW
2. Ground
3. Feedback
4. CTRL
5. Input


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