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UC1874 Folha de dados(PDF) 2 Page - Texas Instruments |
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UC1874 Folha de dados(HTML) 2 Page - Texas Instruments |
2 / 10 page 2 UC1874-1,-2 UC2874-1,-2 UC3874-1,-2 DIL-18 (TOP VIEW) J or N, DW Packages ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC) .............................36V Boost Voltage (BOOT).............................50V OUTPUT Drivers (HDRIVE, LDRIVE) Currents (continuous) ............................... ±0.25A (peak) .......................................±1A VREF Current ........................ Internally Limited Inputs (VSNS, SS, COMP, CT) ................ -0.3 to 10V Inputs (ISNS+, ISNS-) ....................... -0.3 to 20V Outputs (CAOUT) ........................... -0.3 to10V Soft start Sinking Current ........................ 1.5mA Storage Temperature ................... –65°C to +150°C Junction Temperature ................... –65°C to +150°C Lead Temperature (Soldering, 10 sec.) ............. +300°C All currents are positive into, negative out of the specified ter- minal. All voltages are referenced to GND. Consult Packaging Section of Databook for thermal limitations and considerations of packages. CONNECTION DIAGRAMS During standby operation, the output capacitor supplies all of the load current requirements. Normal operation re- turns when the output voltage has drooped by 1%. Re- verse current in the inductor is prevented by on-chip circuitry providing additional efficiency improvements. Virtual 100% duty cycle operation is easily attained by the controller even though a bootstrapped high side drive technique is employed. A low power sleep mode can be invoked through the SS pin. Quiescent supply current in sleep mode is typically less than 50mA. Two UVLO options are available. The UC3874-1 is designed for logic level MOSFETs and has UVLO turn-on and turn-off thresholds of 4.5V and 4.4V respectively. The UC3874-2 is designed for standard power MOSFETs and has UVLO turn-on and turn-off thresholds of 10V and 9V respectively. A precision 2.5V reference can supply 20mA to external circuitry. An error amplifier with soft start, high bandwidth current amplifier, and a synchronizable oscillator are additional features. Available packages include 18-pin plastic and ceramic DIP (N, J), 18-pin SOIC (DW), and 20-pin plastic and ceramic leadless chip carriers (Q, L). PLCC-20 (TOP VIEW) Q Package LCC-28 (TOP VIEW) L Package |
Nº de peça semelhante - UC1874 |
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Descrição semelhante - UC1874 |
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