T6309B Taiwan Memory Technology, T6309B Datasheet
T6309B
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T6309B Summary of contents
Page 1
... LED). The OVP pin can monitor the output voltage and turn off the Voltage converter in the event of overvoltage 400mV condition. The T6309B is available in SOT- 23-6 packages. 1.19V P. 1 T6309B The T6309B is a step-up DC/DC converter Publication Date: SEP. 2005 Revision: A ...
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... Ground pin. Connect to local ground plane. Feedback pin. Reference voltage is 400mV (T6309B-A). Optional 3 reference voltage is 1.19V (T6309B-B). Connect cathode of lowest LED and current sense resistor here. Chip enable pin. Tie CE pin to 1.5V or higher to enable device; 4 0.4V or less to shutdown the device. Do not float this pin. ...
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... Current Limit LIM TM Technology Inc. reserves the right to change products or specifications without notice. = 25°C SOT-23-6 …………. 0.35W A unless otherwise noted ) Conditions T6309B-A T6309B-B ) FB=0.5V OUT ) CE= T6309B Min. Typ. Max Unit 2 340 400 460 mV 1.15 1.19 1.23 V 300 400 550 ...
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... Efficiency=(Vout٠Iout) / (Vin٠Iin) TM Technology Inc. reserves the right to change products or specifications without notice. =4.7uF, C =4.7uF, T A=+25 ºC, unless otherwise noted.) IN OUT Io=20mA 4.0 4.5 5.0 5.5 6.0 (Time=2.0us/Div) (200mV/Div Temperature P. 4 T6309B Efficiency (3WLED) Io=20mA 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Vin(V) Stability for driving 3 LEDs (Time=2.0us/Div) Vin=5 ...
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... LED current regardless the input voltage and number of LEDs connected. With www.DataSheet4U.com integrated overvoltage protection (OVP), the T6309B can be used as a current source with overvoltage protection to drive LEDs. This allows LEDS to be connected in series to the output. The low 400mV feedback reference voltage reduces power loss and improves efficiency ...
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... More details are in the dimming control section Undervoltage Lockout An undervoltage lockout (UVLO) circuit prevents fault operation of the T6309B when input voltage is under 1.75V (typ). The device remains off as long as the input voltage is under the UVLO threshold. TM Technology Inc. reserves the right to change products or specifications without notice ...
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... There are several types of dimming control circuit as follows: 1. Using a PWM signal to CE pin When using a PWM signal at CE pin, the T6309B is turned on or off by the PWM www.DataSheet4U.com signal. The average LED current increases proportionally with the duty cycle of the PWM signal. The typical frequency range of the PWM signal is 150Hz to 250Hz ...
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... Inductor Selection The T6309B is designed to work well with a 10uH inductor in most applications. Low inductance values supply higher output current, but also increase the ripple and reduce efficiency. Higher inductor values reduce ripple and improve efficiency, but also limit output current ...
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... Inductor with 600mA rating or greater would be suitable for the T6309B. www.DataSheet4U.com Capacitor Selection The input capacitor stabilizes the input voltage and minimizes the peak current ripple from the source ...
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... 25K 4.7uF T6309B =20m Publication Date: SEP. 2005 Revision: A ...
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... P. 11 T6309B F E Typ. Max. 0.110 0.118 0.062 0.063 0.112 0.118 0.075(BSC) 0.037(BSC) 0.047 0.057 0.043 0.051 0.003 0.06 0.015 0.018 0.023 0.006 0.009 0~8° 5~15° Publication Date: SEP. 2005 Revision: A ...