Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
UC1854L Datasheet(PDF) 4 Page - Texas Instruments |
|
UC1854L Datasheet(HTML) 4 Page - Texas Instruments |
4 / 9 page Gnd (Pin 1) (ground): All voltages are measured with re- spect to Gnd. VCC and REF should be bypassed directly to Gnd with an 0.1 µF or larger ceramic capacitor. The tim- ing capacitor discharge current also returns to this pin, so the lead from the oscillator timing capacitor to Gnd should also be as short and as direct as possible. PKLMT (Pin 2) (peak limit): The threshold for PKLMT is 0.0V. Connect this input to the negative voltage on the current sense resistor as shown in Figure 1. Use a resis- tor to REF to offset the negative current sense signal up to Gnd. CA Out (Pin 3) (current amplifier output): This is the out- put of a wide-bandwidth op amp that senses line current and commands the pulse width modulator (PWM) to force the correct current. This output can swing close to Gnd, allowing the PWM to force zero duty cycle when neces- sary. The current amplifier will remain active even if the IC is disabled. The current amplifier output stage is an NPN emitter follower pull-up and an 8k resistor to ground. ISENSE (Pin 4) (current sense minus): This is the inverting input to the current amplifier. This input and the non-in- verting input Mult Out remain functional down to and be- low Gnd. Care should be taken to avoid taking these inputs below –0.5V, because they are protected with di- odes to Gnd. Mult Out (Pin 5) (multiplier output and current sense plus): The output of the analog multiplier and the non-in- verting input of the current amplifier are connected to- gether at Mult Out. The cautions about taking ISENSE below –0.5V also apply to Mult Out. As the multiplier out- put is a current, this is a high impedance input similar to ISENSE, so the current amplifier can be configured as a differential amplifier to reject Gnd noise. Figure 1 shows an example of using the current amplifier differentially. IAC (Pin 6) (input AC current): This input to the analog multiplier is a current. The multiplier is tailored for very low distortion from this current input (IAC) to Mult Out, so this is the only multiplier input that should be used for sensing instantaneous line voltage. The nominal voltage on IAC is 6V, so in addition to a resistor from IAC to recti- fied 60Hz, connect a resistor from IAC to REF. If the resis- tor to REF is one fourth of the value of the resistor to the rectifier, then the 6V offset will be cancelled, and the line current will have minimal cross-over distortion. VA Out (Pin 7) (voltage amplifier output): This is the out- put of the op amp that regulates output voltage. Like the current amplifier, the voltage amplifier will stay active even if the IC is disabled with either ENA or VCC. This means that large feedback capacitors across the amplifier will stay charged through momentary disable cycles. Volt- age amplifier output levels below 1V will inhibit multiplier output. The voltage amplifier output is internally limited to approximately 5.8V to prevent overshoot. The voltage amplifier output stage is an NPN emitter follower pull-up and an 8k resistor to ground. VRMS (Pin 8) (RMS line voltage): The output of a boost PWM is proportional to the input voltage, so when the line voltage into a low-bandwidth boost PWM voltage regula- tor changes, the output will change immediately and slowly recover to the regulated level. For these devices, the VRMS input compensates for line voltage changes if it is connected to a voltage proportional to the RMS input line voltage. For best control, the VRMS voltage should stay between 1.5V and 3.5V. REF (Pin 9) (voltage reference output): REF is the output of an accurate 7.5V voltage reference. This output is ca- pable of delivering 10mA to peripheral circuitry and is in- ternally short circuit current limited. REF is disabled and will remain at 0V when VCC is low or when ENA is low. Bypass REF to Gnd with an 0.1 µF or larger ceramic ca- pacitor for best stability. ENA (Pin 10) (enable): ENA is a logic input that will en- able the PWM output, voltage reference, and oscillator. ENA also will release the soft start clamp, allowing SS to rise. When unused, connect ENA to a +5V supply or pull ENA high with a 22k resistor. The ENA pin is not intended to be used as a high speed shutdown to the PWM output. VSENSE (Pin 11) (voltage amplifier inverting input): This is normally connected to a feedback network and to the boost converter output through a divider network. RSET (Pin 12) (oscillator charging current and multiplier limit set): A resistor from RSET to ground will program os- cillator charging current and maximum multiplier output. Multiplier output current will not exceed 3.75V divided by the resistor from RSET to ground. SS (Pin 13) (soft start): SS will remain at Gnd as long as the IC is disabled or VCC is too low. SS will pull up to over 8V by an internal 14 µA current source when both VCC be- comes valid and the IC is enabled. SS will act as the ref- erence input to the voltage amplifier if SS is below REF. With a large capacitor from SS to Gnd, the reference to the voltage regulating amplifier will rise slowly, and in- crease the PWM duty cycle slowly. In the event of a dis- able command or a supply dropout, SS will quickly discharge to ground and disable the PWM. CT (Pin 14) (oscillator timing capacitor): A capacitor from CT to Gnd will set the PWM oscillator frequency accord- ing to this relationship: F = 1.25 RSET × CT VCC (Pin 15) (positive supply voltage): Connect VCC to a stable source of at least 20mA above 17V for normal op- eration. Also bypass VCC directly to Gnd to absorb supply current spikes required to charge external MOSFET gate capacitances. To prevent inadequate GT Drv signals, these devices will be inhibited unless VCC exceeds the upper under-voltage lockout threshold and remains above the lower threshold. PIN DESCRIPTIONS (Pin Numbers Refer to DIL Packages) UC1854 UC2854 UC3854 4 |
Número de pieza similar - UC1854L |
|
Descripción similar - UC1854L |
|
|
Enlace URL |
Política de Privacidad |
ALLDATASHEET.ES |
¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |