数据搜索系统,热门电子元器件搜索 |
|
UC2853A 数据表(PDF) 10 Page - Texas Instruments |
|
|
UC2853A 数据表(HTML) 10 Page - Texas Instruments |
10 / 49 page www.ti.com DEVICE INFORMATION Connection Diagram GND ICOMP ISENSE GATE VCC VSENSE VCOMP VINS 1 2 3 4 8 7 6 5 Pin Descriptions UCC28019 SLUS755B – APRIL 2007 – REVISED DECEMBER 2007 UCC28019 Top View (SOIC-8, PDIP-8) Terminal Functions TERMINAL I/O FUNCTION NAME # Gate drive: Integrated push-pull gate driver for one or more external power MOSFETs. 2.0-A sink and 1.5-A GATE 8 O source capability. Output voltage is clamped at 12.5 V. GND 1 Ground: Device ground reference. Current loop compensation: Transconductance current amplifier output. A capacitor connected to GND ICOMP 2 O provides compensation and averaging of the current sense signal in the current control loop. The controller is disabled if the voltage on ICOMP is less than 0.6 V. Inductor current sense: An input for the voltage across the external current sense resistor, which represents the instantaneous current through the PFC boost inductor. This voltage is averaged to eliminate the effects of ISENSE 3 I noise and ripple. Soft Over Current (SOC) limits the average inductor current. Cycle-by-cycle peak current limit (PCL) immediately shuts off the GATE drive if the peak-limit voltage is exceeded. Use a 220- Ω resistor between this pin and the current sense resistor to limit inrush-surge currents into this pin. Device supply: External bias supply input. Under Voltage Lock Out (UVLO) disables the controller until VCC exceeds a turn-on threshold of 10.5 V. Operation continues until VCC falls below the turn-off (UVLO) VCC 7 threshold of 9.5 V. A ceramic by-pass capacitor of 0.1 µF minimum value should be connected from VCC to GND as close to the device as possible for high frequency filtering of the VCC voltage. Voltage loop compensation: Transconductance voltage error amplifier output. A resistor-capacitor network connected from this pin to GND provides compensation. VCOMP is held at GND until VCC, VINS, and VSENSE all exceed their threshold voltages. Once these conditions are satisfied, VCOMP is charged until the VCOMP 5 O VSENSE voltage reaches 95% of its nominal regulation level. When the Enhanced Dynamic Response (EDR) is engaged, additional current is applied to VCOMP to reduce the charge time. EDR additional current is inhibited during soft-start. Soft-start is programmed by the capacitance on this pin. Input ac voltage sense: Input Brown Out Protection (IBOP) detects when the system ac-input voltage is above a user-defined normal operating level, or below a user-defined “brown-out” level. A filtered resistor-divider network connects from this pin to the rectified-mains node. At startup the controller is disabled VINS 4 I until the VINS voltage exceeds a threshold of 1.5 V, initiating a soft-start. The controller is also disabled if VINS drops below the brown-out threshold of 0.8 V. Operation will not resume until both VINS and VSENSE voltages exceed their enable thresholds, initiating another soft-start. Output voltage sense: An external resistor-divider network connected from this pin to the PFC output voltage provides feedback sensing for output voltage regulation. A small capacitor from this pin to GND filters high-frequency noise. Standby disables the controller and discharges VCOMP when the voltage at VSENSE drops below the enable threshold of 0.8V. An internal 100nA current source pulls VSENSE to GND for VSENSE 6 I Open-Loop Protection (OLP), including pin disconnection. Output over-voltage protection (OVP) disables the GATE output when VSENSE exceeds 105% of the reference voltage. Enhanced Dynamic Response (EDR) rapidly returns the output voltage to its normal regulation level when a system line or load step causes VSENSE to fall below 95% of the reference voltage. 10 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): UCC28019 |
类似零件编号 - UC2853A |
|
类似说明 - UC2853A |
|
|
链接网址 |
隐私政策 |
ALLDATASHEETCN.COM |
ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 链接交换 | 制造商名单 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 |