TS19371 Taiwan Semiconductor Company, Ltd. (TSC), TS19371 Datasheet

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TS19371

Manufacturer Part Number
TS19371
Description
Boost Step-up Wled Driver With Ovp
Manufacturer
Taiwan Semiconductor Company, Ltd. (TSC)
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TS19371CX6
Quantity:
38
Part Number:
TS19371CX6RF
Manufacturer:
MICRON
Quantity:
1 001
General Description
The TS19371 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The
device can drive up to 126 LEDs (9S14P) from a 12V supply. The output capacitor can be as small as 4.7µF, 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 TS19371 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.
Features
Application
Typical Application Circuit
Inherently Matched LED Current
High Efficiency: 89% Typical
Drives Up to 9 LEDs Series @ Vin 9~15V
Drives Up to 126 LEDs (9S14P) @ Vin 12~15V
Drives Up to 6 (1W) LEDs Series @ Vin 12V
Over Output Voltage Protection 30V
Fast 1.2MHz Switching Frequency
Requires Only 4.7µF Output Capacitor
PWM dimming control 1KHz to 10KHz
Analog dimming control
Cellular Phones
Portable Electronics Devices PDA, GPS
LCD Display Module
White LED Backlighting
SOT-26
Pin Definition:
1. SW
2. Ground
3. Feedback
6. Input
5. OVP
4. CTRL
Boost (Step-up) WLED Driver with OVP
1/8
Ordering Information
Input Voltage vs. Efficiency
TS19371CX6 RF
Part No.
Package
SOT-26
3Kpcs / 7” Reel
TS19371
Packing
Version: F08

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TS19371 Summary of contents

Page 1

... Feedback General Description The TS19371 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive up to 126 LEDs (9S14P) from a 12V supply. The output capacitor can be as small as 4.7µF, 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 ...

Page 2

... CTRL = 0V F RSW TMX 250mA SAT LKG SW High V CTL Low I Ctrl = 2V CTL OVP θ JA 2/8 TS19371 Limit 20 2 -40 to +85 -40 to +125 =0.22uF unless otherwise noted) Min Typ Max 2 110 10 45 100 -- 2.1 3.0 -- 0.1 1.0 0.8 1.2 1.6 -- 650 -- ...

Page 3

... Shutdown Pin and Dimming Control Pin. VCTRL > 1.8V generates full-scale LED current VCTRL < 0.4V chip is off Switching from 04V to 2.0V, PWM duty cycle controls the LED current Over Voltage Protection, 30V Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible 3/8 TS19371 Version: F08 ...

Page 4

... Over Voltage Protection The TS19371 has design an internal latched off open-circuit protection circuit, the additional sense pin to detect the voltage when the LEDs are disconnected from the circuit or fail open, the TS19371 will shutdown until input condition changes to bring it out of the shutdown mode. ...

Page 5

... Typical Application Circuit for 1W LED VIN Range VOUT Max. L (uH) (V) (V) 12~ Boost (Step-up) WLED Driver with OVP LED LED Current (Series) (Parallel) (mA) 6pcs 14 20 9pcs 10 20 9pcs 14 20 9pcs LED Current Resistor (Series) (mA) (Ω) 6pcs 350 0.22 5/8 TS19371 Resistor Efficiency (Ω) (%) 4.75 81.2 4.75 83.6 4.75 87.2 4.75 88.4 Efficiency (%) 88 Version: F08 ...

Page 6

... Using a PWM Signal to SHDN Pin With the PWM signal applied to the SHDN pin, the TS19371 is turned on or off by the PWM signal. The LEDs operate at either zero or full current. The average LED current increases proportionally with the duty cycle of the PWM signal duty cycle will turn off the TS19371 and corresponds to zero LED current ...

Page 7

... Device Code Y = Year Code M = Month Code (A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oct, K=Nov, L=Dec Lot Code 7/8 TS19371 SOT-26 DIMENSION MILLIMETERS INCHES MIN TYP MAX MIN TYP 0.95 BSC 0.0374 BSC 1.9 BSC 0.0748 BSC 2.60 2.80 3.00 ...

Page 8

... The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale. Boost (Step-up) WLED Driver with OVP Notice 8/8 TS19371 Version: F08 ...

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