tm TE CH Preliminary T8601 High Voltage LED Driver FEATURES GENERAL DESCRIPTION • Switch-mode controller for single switch LED driver • Wide operating voltage range : 8Vdc ~ 450Vdc • Open-loop peak current mode controller without loop compensation • Constant frequency or constant off-time mode • PWM or analog dimming capability • Few external components required • SOP-8 Lead-free Package The T8601 is a low cost, simple, highefficiency off-line LED driver IC. A built-in high voltage regulator enables the T8601 to work from 8Vdc to 450Vdc. The T8601 is operated in an open loop, peak current mode to produce a constant LED current rather than constant voltage. The T8601 drives an external power MOSFET in either a constant frequency or constant off-time mode. The T8601 features PWM and linear dimming capability. To control LED brightness, the LED current can be controlled by applying a PWM signal with a duty ratio of 0~100% and a frequency up to a few kilohertz, or it can be adjusted linearly to any value between 0 ~ 250mV(typ.) by applying an analog voltage to the LD pin. The T8601 is available in SOP-8 Lead-free package. Applications • TFT flat panel backlighting • AC/DC LED lamps • DC/DC, AC/DC LED drivers • T5, T8 LED line bars • MR-16 lamps • Signage or decorative LED lamps PART NUMBER EXAMPLES PART NO. T8601-AD TM Technology Inc. reserves the right P. 1 to change products or specifications without notice. PACKAGE SOP-8 Publication Date: APR. 2010 Revision: A tm TE CH Preliminary T8601 PIN ARRANGEMENT(Top view) 1 2 V IN CS GND GATE 3 8 7 6 4 5 RT LD VDD PW M D SOP-8 PIN DESCRIPTION SYMBOL SOP-8 DESCRIPTION VIN 1 CS 2 GND 3 GATE 4 PWMD 5 VDD 6 LD 7 RT 8 The supply of an internal 8.0dc ~ 450Vdc voltage regulator. Being used to sense the external power MOSFET current by means of an external sense resistor. When the CS voltage exceeds the lower of either the reference 250mV (typ) or the the LD voltage, the GATE goes low. The T8601 ground. It has to be electrically connected to the ground of the power train. The output of driver for an external N-channel MOSFET. The enable and PWM dimming inputs of the IC. When this PWMD is pulled to GND, the GATE goes low. When the PWMD is pulled high, the GATE driver works normally. Internally regulated voltage. It must be bypassed with a sufficient, low ESR capacitor to GND. The linear dimming input. It sets the current sense threshold as the LD voltage is less than 250mV (typ). This pin sets the switching frequency or off-time. As the T8601 works in constant frequency mode, a resistor is connected between RT and GND; as the IC operates in constant off-time mode, a resistor is connected between RT and GATE. TM Technology Inc. reserves the right P. 2 to change products or specifications without notice. Publication Date: APR. 2010 Revision: A tm TE CH Preliminary T8601 Block Diagram ABSOLUTE MAXIMUM RATINGS Package Power Dissipation @TA=25ºC θJC ºC/W θJA ºC/W SOP-8 With Heat Slug 0.6W 23 70 Parameter VIN to GND CS, GATE, PWMD, LD, RT to GND VDDto GND Operating Junction Temperature Storage Temperature Value -0.5 ~ 450 -0.3 ~ (VDD+0.3) +13.5 -40 ~ +125 -65 ~ +150 TM Technology Inc. reserves the right P. 3 to change products or specifications without notice. Units V V V °C °C Publication Date: APR. 2010 Revision: A tm TE CH Preliminary T8601 Electrical Characteristics Parameter Input Input DC voltage range (The specification and production tested at TA=25°C, unless otherwise noted.) Symbol Condition Min. Typ. Max. Units VINDC DC input voltage 8 – 450 V Chip shut-down current VDD maximum Voltage Internal Regulator Output voltage IINSD VDDmax PMD to GND, VIN = 8~450V External voltage applied to VDD pin – – 0.5 – 1.0 13.5 mA V VDD 7.0 7.5 8.0 V Line regulation ∆VDD,Line 1 V Load regulation ∆VDD,Load VIN = 8V, 2.2uF at VDD, IDD(ext)=0, 500pF at GATE, RT=226kΩ, PWMD=VDD VIN = 8~450V, 2.2uF at VDD, IDD(ext)=0, 500pF at GATE, RT=226kΩ, PWMD=VDD VIN = 12V, 2.2uF at VDD, IDD(ext)=0~1mA, 500pF at GATE, RT=226kΩ, PWMD=VDD VDD rising VDD under voltage UVLO lockout threshold VDD under voltage ∆UVLO lockout hysteresis PWM Dimming PWMD input low VPWMD(lo) voltage PWMD input high VPWMD(hi) voltage PWMD pull-down RPWMD resistance Current Sense Comparator Current sense threshold VCS,TH voltage Current Sense Blanking TBLANK Interval Delay from CS trip to TDELAY GATE low GATE Driver GATE sourcing current ISOURCE GATE sinking current ISINK GATE output rise time TRISE GATE output fall time TFALL Oscillator Oscillator frequency fOSC1 Oscillator frequency fOSC2 0 0 – 100 mV 6.2 6.7 6.95 V VDD falling – 500 – mV VIN = 8~450V – – 1 V VIN = 8~450V 2.4 – – V VPWMD = 5V 50 100 150 kΩ VIN = 12V 225 250 275 mV 215 280 ns 300 ns VIN = 12V, VCS = 0.4V, VLD = VDD VIN = 12V, VLD =VDD, VCS = 0~ 0.4V step after TBLANK 150 – VGATE = 0V, VDD = 7.5V VGATE = VDD= 7.5V CGATE = 500pF, VDD = 7.5V CGATE = 500pF, VDD = 7.5V 165 165 – – 30 30 50 50 mA mA ns ns VIN = 12V, RT= 1MΩ VIN = 12V, RT= 226KΩ 20 80 25 100 30 120 kHz kHz TM Technology Inc. reserves the right P. 4 to change products or specifications without notice. Publication Date: APR. 2010 Revision: A tm TE CH Preliminary T8601 TYPICAL APPLICATION CIRCUITS TM Technology Inc. reserves the right P. 5 to change products or specifications without notice. Publication Date: APR. 2010 Revision: A tm TE CH Preliminary T8601 PACKAGE DIMENSIONS 8-LEAD SOP B B1 A1 C1 C2 A C F D Symbol A A1 B B1 C C1 C2 D E F J K H Min. 5.70 3.75 1.35 0.10 0.31 0.30 0.10 Dimension in mm Typ. 6.00 3.95 1.27 1.55 0.41 0.50 0.15 2.23 REF 2.97 REF 0~8° E H Max. 6.30 4.10 5.13 1.80 1.75 0.25 0.51 0.70 0.25 Min. 0.224 0.148 0.052 0.001 0.012 0.012 0.004 Dimension in inch Typ. 0.236 0.156 0.050 0.061 0.016 0.020 0.006 0.088 REF 0.117 REF 0~8° TM Technology Inc. reserves the right P. 6 to change products or specifications without notice. Max. 0.248 0.164 0.202 0.071 0.069 0.004 0.020 0.028 0.010 Publication Date: APR. 2010 Revision: A