unisonic technologies co., ltd uac33092a linear integrated circuit www.unisonic.com.tw 1 of 5 copyright ? 2011 unisonic technologies co., ltd qw-r121-005.c alternator voltage regulator ? description the utc uac33092a is designed for load response control and voltage regulation of diode re ctified alternator charging systems for automotive applications. ? features * forced load response control (lrc) with heavy load transitions at low rpm * voltage regulated to 0.1v @ 25c * external resistor adjustable operating frequency * regulation is effective with loads as high as 1.0a * load dump protection of lamp, field control devices, and loads * undervoltage, overvoltage , phase fault (broken belt) detection and duty cycle limited protections ? ordering information ordering number lead free halogen free package packing UAC33092AL-S20-R uac33092ag-s20-r sop-20 tape reel uac33092al-s20-t uac33092ag-s20-t sop-20 tube
uac33092a linear integrated circuit unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r121-005.c ? pin configuration ? pin description pin no. pin name description 1 fb this pin provides sense input or the supply regulation input. 2 sense the sense input is input for the true battery voltage. 3 lamp collector and power-up/down this pin connects to drive the fault lamp. it is also used to sense a closed ignition switch (voltage sense). 4 lamp base this pin provides base current to the fault lamp drive transistor (q2). 5 ground this pin is for ground return for the fault lamp control logic circuit. 6 ground ic ground 7 oscillator adjust connected to a resistor to gro und that adjusts the internal oscillator frequency 8 v ref this is a pin for the 1.1 v ~ 1.4 v reference voltage test. 9 oscillator this is a pin for checking t he operation of the internal oscillator. 10 phase the phase input detects the existence of a magnetic field rotating within the alternator. 11 rate the rate pin is load response control recovery rate selector pin used to select a slow mode (floating) or fast mode (ground). 12 supply regulation the supply regulation pin is used as a re presentation of the alternator output voltage. this input also used to moni tor overvoltage or load dump conditions. 13 vcc3 voltage supply for the internal charge pump. 14 vcc1 voltage supply for the entir e ic except for the charge pump. 15 ground ground for the ic. 16 n/c no connection. 17 gate the gate controls of the mosf et used to energize the field winding. 18 source mosfet source reference for field winding control. 19 undervoltage if this pin have voltage goes below 1.0 v, the fault lamp is turn on. the ic will continue to function, but wi th limited performance. 20 v ref pin for the band gap reference voltage 1.7 v ~ 2.3 v. note: pin 8, and 20 are test points only
uac33092a linear integrated circuit unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r121-005.c ? block diagram lost sense circuit x1 counter + - prescaler (2 ) 4 oscillator signal combiner and switch low pass filter bandgap reference power supply charge pump dac prescaler (2 ) 6 divide by (1/12/48) up/down counter (2 ) 4 11 rate oscillator 9 6 15 gnd 5 gnd 4 lamp base 3 lamp coii. 18 source gate 17 vcc3 vcc1 14 13 8 v ref 20 v ref uv 19 fb 1 utc uac3092a 2 sense (remote) 12 supply reg (local) 10 phase 7 osc. adjust buff + - + - regulate load dump + - undervoltage bias output control + - overvoltage control logic 12 4 8 lamp control logic power up/down circuit
uac33092a linear integrated circuit unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r121-005.c ? absolute maximum ratings (ta=25 ) parameter symbol ratings unit power supply voltage load dump transient voltage (note 1) negative voltage (note 2) v bat +v max -v min 24 40 -2.5 v power dissipation (ta=125 ) p d 867 m/w operating junction temperature t j +150 operating ambient te mperature range t opr -35 ~ +125 storage temperature range t stg -45 ~ +150 note: 1. 125 ms wide square wave pulse. 2. maximum time = 2 minutes. 3. absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operation is not implied. ? thermal data parameter symbol ratings unit thermal resistance, junction to ambient ja 75 c/w ? electrical characteristics (external components per figure 1,ta=25 , unless otherwise noted.) parameter symbol test conditions min typ max unit dc characteristics regulation voltage v reg determined by external resistor divider 14.85 v regulation voltage temperature coefficient t c -13 -11 -9.0 mv/ suggested battery voltage operating range v bat 11.5 14.85 16.5 v power up/down threshold voltage (pin 3) v pwr 0.5 1.2 2.0 v standby current i q1 i q2 v bat =12.8v, ignition off, ta=25 v bat =12.8v, ignition off, -35 ta 125 1.3 2.0 3.0 ma zero temperature coefficient reference voltage, (pin 8) v ref 1.1 1.25 1.4 v band gap reference voltage (pin 20) v ref 1.7 2.0 2.3 v band gap reference temperature coefficient tc -13 -11 -9.0 mv/ sense loss threshold (pin 2) s loss (th) 0.6 1.0 v phase detection threshold voltage (pin 10) p th 1.0 1.25 1.5 v phase rotation detection frequency (pin 10) p rot 36 hz undervoltage threshold (pin 19) u uv 1.0 1.25 1.5 v overvoltage threshold v ov pin 2, or pin 12 if pin 2 is not used 1.09(v ref ) 1.12(v ref ) 1.16(v ref ) v load dump threshold v ld pin 2, or pin 12 if pin 2 is not used 1.33(v ref ) 1.4(v ref ) 1.48(v ref ) v
uac33092a linear integrated circuit unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r121-005.c ? electrical characteristic(cont.) parameter symbol test conditions min typ max unit switching characteristics fundamental regulation output frequency. (pin 17) f clock oscillator frequency divided by 4096 68 hz suggested clock oscillator frequency range, (pin 9) f osc determined by external resistor, r t 205 280 350 khz duty cycle (pin 17) at start-up during overvoltage condition startdc ov dc 27 3.5 29 4.7 31 5.5 % % low/high rpm transition frequency (pin 10) lrc freq 247 273 309 hz lrc duty cycle increase rate lrc s lrc f lrc h low rpm mode(lrcfreq<247hz) pin 11 =open (slow rate) low rpm mode(lrcfreq<247hz) pin 11 =grounded (fast rate) high r pmmode(lrcfreq>309hz) pin 11 = don?t care (lrc mode is disabled) 8.5 34 409 9.5 38 455 10.5 42 501 %/sec utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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