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UCC2808N-1 Datasheet(PDF) 7 Page - Texas Instruments |
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UCC2808N-1 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 22 page 3 1 2 8 7 6 5 4 OSCILLATOR S Q R RC 1.2R R 0.5 V PEAK CURRENT COMPARATOR Q Q T S Q R S Q R VDD VOLTAGE REFERENCE 14 V PWM COMPARATOR PWM LATCH SOFT START 0.5 V VDD–1 V 0.75 V 2.2 V 2.0 V FB COMP CS VDD OUTA OUTB GND SLOPE = 1 V/ms VDD OK OVERCURRENT COMPARATOR 22 k Ω UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2 www.ti.com SLUS168E – APR 1999 – REVISED AUGUST 2015 7 Detailed Description 7.1 Overview The UCCx808-x device is a highly-integrated, low power current mode push-pull PWM controller. The controller employs low starting current, and employs an internal control algorithm that offers accurate static output voltage regulation against line and load. The UCCx808-x family offers a variety of package temperature range options, and choice of undervoltage lockout levels. The family has UVLO thresholds and hysteresis options for offline and battery-powered system. Table 1. Undervoltage Lockout Levels PART NUMBER TURN ON THRESHOLD TURN OFF THRESHOLD UCCx808-1 12.5 V 8.3 V UCCx808-2 4.3 V 4.1 V Table 2. Undervoltage Lockout Options PACKAGED DEVICES TA = TJ UVLO OPTION SOIC (D) PDIP (N) 12.5 V/8.3 V UCC2808D-1 UCC2808N-1 –40°C to 85°C 4.3 V/4.1 V UCC2808D-2 UCC2808N-2 12.5 V/8.3 V UCC3808D-1 UCC3808N-1 0°C to 70°C 4.3 V/4.1 V UCC3808D-2 UCC3808N-2 7.2 Functional Block Diagram Pinout shown is for SOIC and PDIP packages. Figure 4. Functional Block Diagram Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: UCC2808-1 UCC2808-2 UCC3808-1 UCC3808-2 |
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