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MC33364D bảng dữ liệu(PDF) 4 Page - ON Semiconductor |
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MC33364D bảng dữ liệu(HTML) 4 Page - ON Semiconductor |
4 / 16 page MC33364 http://onsemi.com 4 PIN DESCRIPTION Pin Function Description 1(1) Zero Current Detect The ZCD Pin ensures critical conduction mode. ZCD monitors the voltage on the auxiliary winding, during the demagnetization phase of the transformer, comparing it to an internal reference. The ZCD sets the latch for the output driver. 3(2) Current Sense The Current Sense Pin monitors the current in the power switch by measuring the voltage across a resistor. Leading Edge Blanking is utilized to prevent false triggering. The voltage is compared to a resistor divider connected to the Voltage Feedback Pin. A 110 mV voltage off--set is applied to compensate the natural optocoupler saturation voltage. 4(3) Voltage Feedback The Voltage Feedback Pin is typically connected to the collector of the optocoupler for feedback from the isolated secondary output. The Feedback is connected to the Vref Pinviaa5kresistor providing bias for the external optocoupler. 6(4) Vref The Vref Pin is a buffered internal 5.0 V reference with Undervoltage Lockout. 8(NA) Frequency Clamp The Frequency Clamp Pin ensures a minimum off--time value, typically 6.9 ms. It prevents the MOSFET from restarting within a fixed (33364D1) or adjustable (33364D) delay. The minimum off--time is disabled in the 33364D2. Therefore the maximum switching frequency cannot exceed 1/(TON +TOFFmin). 9(5) AGND This pin is the ground for the internal circuitry excluding the gate drive stage. 10 (5) PGND This pin is the ground for the gate drive stage. 11 (6) Gate Drive The gate drive is the output to drive the gate of the power MOSFET. 12 (7) VCC Provides the voltage for all internal circuitry including the gate drive stage and Vref. This pin has Undervoltage Lockout with hysteresis. 16 (8) Line The Line Pin provides the initial power to the VCC pins. Internally the line pin is a high voltage current source, eliminating the need for an external startup network. NOTE: For further information please refer to the following Application Notes; AN1594: Critical Conduction Mode, Flyback Switching Power Supply Using the MC33364. AN1681: How to keep a Flyback Switch--Mode Power Supply Stable with a Critical--Mode Controller. MAXIMUM RATINGS (TA =25C, unless otherwise noted.) Rating Symbol Value Unit Power Supply Voltage (Operating) VCC 16 V Line Voltage VLine 700 V Current Sense, Compensation, Voltage Feedback, Restart Delay and Zero Current Input Voltage Vin1 --1.0to+10 V Zero Current Detect Input Iin 5.0 mA Restart Diode Current Iin 5.0 mA Power Dissipation and Thermal Characteristics D1 and D2 Suffix, Plastic Package Case 751 Maximum Power Dissipation @ TA =70C PD 450 mW Thermal Resistance, Junction--to--Air RθJA 178 C/W D Suffix, Plastic Package Case 751B--05 Maximum Power Dissipation @ TA =70C PD 550 mW Thermal Resistance, Junction--to--Air RθJA 145 C/W Operating Junction Temperature TJ 150 C Operating Ambient Temperature TA --25 to +125 C Storage Temperature Range Tstg --55 to +150 C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. NOTE: ESD data available upon request. |
Số phần tương tự - MC33364D |
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Mô tả tương tự - MC33364D |
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