Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
LTC3114-1 Datasheet(PDF) 13 Page - Analog Devices |
|
LTC3114-1 Datasheet(HTML) 13 Page - Analog Devices |
13 / 34 page LTC3114-1 13 Rev. D For more information www.analog.com OPERATION Oscillator The LTC3114-1 operates from an internal oscillator with a nominal fixed frequency of 1.2MHz. This allows the DC/DC converter efficiency to be maximized while still using small external components. Current Mode Control The LTC3114-1 utilizes average current mode control for the pulse width modulator as shown in Figure 2. Current mode control, both average and the better known peak method, enjoy some benefits compared to other control methods including: simplified loop compensation, rapid response to load transients and improved rejection of line voltage transients. Referring to Figure 2, an internal high gain transconduc- tance error amplifier monitors VOUT through a voltage divider connected to the FB pin and provides an output, VC, that is used by the current mode control loop to com- mand the appropriate inductor current level. To ensure stability, external frequency compensation components (CP1, CP2 and RZ) must be installed between VC and ground. The procedure for determining these components is provided in the Applications Information section of this data sheet. VC is internally connected to the noninvert- ing input of a high gain, integrating, operational amplifier, referred to in Figure 2, as the average current amp. The inverting input of the average current amplifier is con- nected to the inductor current sense circuit through a gain setting resistor (RCS1) and to its output (VIA) through an internal frequency compensation network comprised of RCS2, CCS1 and CCS2. The average current amplifier’s output provides the cycle-by-cycle duty cycle command into the buck-boost PWM circuitry. PWM A B C D CONTROL LOGIC VIA AVERAGE CURRENT AMP VOLTAGE ERROR AMP ACTIVE RANGE OF VC = 135mV TO 1V SOFT-START 1V RCS1 CCS2 RCS2 CCS1 RZ RBOT RTOP CP1 CP2 RCOESR RLOAD VOUT COUT RX gm = 111µA/V VIN SWB SWC SWD PVOUT SWA RA 250m VDS SENSE L1 VDS SENSE 1V gm = 120µS RO = 3.6M FB VC GND 31141 F02 gm INDUCTOR ISENSE Figure 2. Average Current Mode Control Loop |
Número de pieza similar - LTC3114-1 |
|
Descripción similar - LTC3114-1 |
|
|
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 |