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UC28025DWR Arkusz danych(PDF) 1 Page - Texas Instruments |
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UC28025DWR Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 19 page UC28023 UC28025 SLUS557F -- MARCH 2003 -- REVISED AUGUST 2010 ECONOMY HIGH-SPEED PWM CONTROLLER 1 www.ti.com FEATURES D Peak Current Mode, Average Current Mode, or Voltage Mode (with Feed-Forward) Control Methods D Practical Operation Up to 1 MHz D 50-ns Propagation Delay to Output D ±1.5-A Peak Totem Pole Outputs D 9-V to 30-V Nominal Operational Voltage Range D Wide Bandwidth Error Amplifier D Fully Latched Logic with Double Pulse Suppression D Pulse-by-Pulse Current Limiting D Programmable Maximum Duty Cycle Control D Under--Voltage Lockout with Hysteresis D Trimmed 5.1-V Reference with UVLO D Same Functionality as UC3823 and UC3825 APPLICATIONS D Off-Line and DC/DC Power Supplies D Converters Using Voltage Mode, Peak Current Mode, or Average Current Mode Control Methods D Single-Ended or Two-Switch Topology Designs DESCRIPTION The UC28023 and UC28025 are fixed-frequency PWM controllers optimized for high-frequency switched-mode power supply applications. The UC28023 is a single output PWM for single-ended topologies while the UC28025 offers dual alternating outputs for double-ended and full bridge topologies. Targeted for cost effective solutions with minimal external components, UC2802x include an oscillator, a temperature compensated reference, a wide band width error amplifier, a high-speed current-sense comparator and high-current active-high totem-pole outputs to directly drive external MOSFETs. Protection circuitry includes a current limit comparator with a 1-V threshold, a TTL compatible shutdown port, and a soft-start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at an output. An undervoltage lockout section with 800 mV of hysteresis assures low start-up current. During undervoltage lockout, the outputs are high impedance. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. Devices are available in the industrial temperature range of --40°C to 105°C. Package offerings are 16-pin SOICW (DW), or 16-pin PDIP (N) packages. ORDERING INFORMATION T T OUTPUT EXTERNAL CURRENT PACKAGED DEVICES TA= TJ OUTPUT CONFIGURATION EXTERNAL CURRENT LIMIT REFERENCE PDIP-16 (N) SOICW--16 (DW) 40°C to 105°C Single Yes UC28023N UC28023DW --40°C to 105°C Dual Alternating No UC28025N UC28025DW (1) The DW package are also available taped and reeled. Add an R suffix to the device type (i.e., UC28023DWR (2,000 devices per reel). PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2005 -- 2010, Texas Instruments Incorporated |
Podobny numer części - UC28025DWR |
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Podobny opis - UC28025DWR |
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