Os motores de busca de Datasheet de Componentes eletrônicos |
|
MC34717EPR2 Folha de dados(PDF) 11 Page - Freescale Semiconductor, Inc |
|
MC34717EPR2 Folha de dados(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 25 page Analog Integrated Circuit Device Data Freescale Semiconductor 11 34717 FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION Today’s advanced systems are increasingly requiring more efficient and accurate power supplies. They present a set of challenges that include highly accurate voltage regulation, high current and fast transient response capability, voltage monitoring (power sequencing), and increased operating frequency. Point of Load power supplies offer adequate solutions to these challenges. They are non- isolated DC to DC converters that are located near their load and take their input voltage from an intermediate not, necessarily, regulated bus. their close proximity to the load is of a high importance with newer device requirements. While meeting the challenges, they allow for higher efficiency, localized protection, and minimum distribution losses. Their compact design and value makes them cost effective. The 34717 is a PoL dual output power supply. Its integrated solution offers a cost effective system and reliable operation. It utilizes a voltage mode synchronous buck switching converter topology with integrated low RDS(ON) (50 mΩ) N-channel power MOSFETs for higher efficiency operation. It provides an output voltage with an accuracy of less than ±2.0 %, and capable of supplying up to 5.0 A of continuous current from both channels. The second output tracking abilities makes it ideal for systems with multiple related supply rails. It has a programmable switching frequency that allows for flexibility and optimization over the operating conditions and can operate at up to 1.0 MHz to significantly reduce the external components size and cost. It also provides the ability to program the over current limit for both channels. It protects against output over current, overvoltage, undervoltage, and overtemperature conditions. It also protects the system from short circuit events. It incorporates a power good output signal to alert the host when a fault occurs. It can be enabled and disabled by controlling the SD pin, which offers power sequencing capabilities. By integrating the control/supervisory circuitry along with the Power MOSFET switches for the buck converter into a space-efficient package, the 34717 offers a complete, small- size, cost-effective, and simple solution to satisfy the needs of today’s systems. FUNCTIONAL PIN DESCRIPTION BOOTSTRAP INPUT (BOOT1, BOOT2) Bootstrap capacitor input pin. Connect a capacitor (as discussed in Bootstrap capacitor on page 19) between this pin and the SW pin of the respective channel to enhance the gate of the high-side Power MOSFET during switching. POWER INPUT VOLTAGE (PVIN1, PVIN2) Buck converter power input voltage. This is the drain of the buck converter high-side power MOSFET. SWITCHING NODE (SW1, SW2) Buck converter switching node. This pin is connected to the output inductor. POWER GROUND (PGND1, PGND2) Buck converter and discharge MOSFETs power ground. It is the source of the buck converter low-side power MOSFET. COMPENSATION INPUT (COMP1, COMP2) Buck converter external compensation network connects to this pin. Use a type III compensation network. ERROR AMPLIFIER INVERTING INPUT (INV1, INV2) Buck converter error amplifier inverting input. Connect the output to the INV pin through a resistor divider. OUTPUT VOLTAGE DISCHARGE PATH (VOUT1, VOUT2) Buck converter output voltage is connected to this pin. It only serves as the output discharge path once the SD signal is asserted. INTERNAL SUPPLY VOLTAGE OUTPUT (VDDI) This is the output of the internal bias voltage regulator. Connect a 1.0 µF, 6 V low ESR ceramic filter capacitor between this pin and the GND pin. Filtering any spikes on this output is essential to the internal circuitry stable operation. SIGNAL GROUND (GND) Analog ground of the IC. Internal analog signals are referenced to this pin voltage. INPUT SUPPLY VOLTAGE (VIN) IC power supply input voltage. Input filtering is required for the device to operate properly. POWER GOOD OUTPUT SIGNAL (PG) This is an active low open drain output that is used to report the status of the device to a host. This output activates after a successful power up sequence and stays active as long as the device is in normal operation and is not experiencing any faults. This output activates after a 10 ms |
Nº de peça semelhante - MC34717EPR2 |
|
Descrição semelhante - MC34717EPR2 |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | 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 |