| 品牌 | top best | 型號 | tb99 |
| 批號 | 09 | 封裝 | sop-8 |
| 營銷方式 | 現貨 | 產品性質 | 熱銷 |
| 處理信號 | 數字信號 | 工藝 | 半導體集成 |
| 導電類型 | 單極型 | 集成程度 | 小規模 |
| 規格尺寸 | 2*5（mm） | 工作溫度 | -40~85（℃） |
| 靜態功耗 | 0.5~1（mw） |
(一) tb99 features:
(二) tb99 applications:
(三) tb99 general description:
1.>>the tb99 is a pwm high-effi ciency led driver control ic.it allows effi cient eration of high brightness (hb) ledsfrom voltage sources ranging from 8vdc up to 500vdc.the tb99 controls an external mosfet at fi xed switchingfrequency up to 300khz. the frequency can be programmedusing a single resistor. the led string is driven at constant current rather than constant voltage, thus providing constantlight output and enhanced reliability. the output current canbe programmed between a few milliamps and up to more than 1.0a.tb99 uses a rugged high voltage junction isolated processthat can withstand an input voltage surge of up to 500v.output current to an led string can be programmed to any value between zero and its maximum value by applying anexternal control voltage at the linear dimming control inputof the tb99. the tb99 provides a low-frequency pwm dimming input that can accept an external control signal with aduty ratio of 0-100% and a frequency of up to a few kilohertz.
2.>>the tb99 is a low-cost off-line buck, boost or buck-boost converter control ic specifi cally designed for driving multi-led stings or arrays. it can be operated from either universal ac line or any dc voltage between 8-500v. optionally, a passive power factor correction circuit can be used in order to pass the ac harmonic limits set by en 61000-3-2 class c for lighting equipment having input power less than 25w. the tb99 can drive up to hundreds of high-brightness (hb)leds or multiple strings of hb leds. the led arrays can be confi gured as a series or series/parallel connection. the tb99 regulates constant current that ensures controlled brightness and spectrum of the leds, and extends their lifetime. the tb99 features an enable pin (pwm_d) that allows pwm control of brightness.
(四) tb99 typical application:
(五) tb99 electrical characteristics:
| symbol | parameter | min | type | max | units | conditions |
| vindc | input dc supply voltage range | 8.0 | 500 | v | dc input voltage | |
| iinsd | shut-down mode supply current | - | 0.5 | 1 | ma | pin pwm_d to gnd, vin= 8v |
| vdd | internally regulated voltage | 7.0 | 7.5 | 8.0 | v | vin= 8 – 450v, idd(ext)= 0, pin gate open |
| vddmax | maximal pinvddvoltage | - | - | 13.5 | v | when an external voltage applied to pin vdd |
| idd(ext) | vddcurrent available for xternal circuitry | - | - | 1.0 | ma | vin= 8 – 100v |
| uvlo | vddundervoltage lockout threshold | 6.45 | 6.7 | 6.95 | v | vinrising |
| δuvlo | vddundervoltage lockout hysteresis | - | 500 | - | mv | vinfalling |
| ven(lo) | pin pwm_d input low voltage | - | - | 1.0 | v | vin= 8 – 500v |
| ven(hi) | pin pwm_d input high voltage | 2.4 | - | - | v | vin= 8 – 500v |
| ren | pin pwm_d pull-down resistance | 50 | 100 | 150 | kω | ven= 5v |
| vcs(hi) | current sense pull-in threshold voltage | 225 | 250 | 275 | mv | @ta = -40°c to +85°c |
| vgate(hi) | gate high output voltage | vdd-0.3 | - | vdd | v | iout= 10ma |
| vgate(lo) | gate low output voltage | 0 | - | 0.3 | v | iout= -10ma |
| fosc | oscillator frequency | 20 80 | 25 100 | 30 120 | khz khz | rosc= 1.00mω rosc= 226kω |
| dmaxhf | maximum pwm duty cycle | - | - | 100 | % | fpwmhf= = 25khz, at gate, cs to gnd |
| vld | linear dimming pin voltage range | 0 | - | 250 | mv | @ta = <85°c, vin = 12v |
| tblank | current sense blanking interval | 150 | 215 | 280 | ns | vcs= 0.55vld, vld= vdd |
| tdelay | delay from cs trip to gate lo | - | - | 300 | ns | vin= 12v, vld= 0.15, vcs= 0 to 0.22v after tblank |
| trise | gate output rise time | 30 | 50 | ns | cgate= 500pf | |
| tfall | gate output fall time | 30 | 50 | ns | cgate= 500pf |