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LTC3736-1 Datasheet(PDF) 11 Page - Linear Technology |
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LTC3736-1 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 28 page  11 LTC3736-1 37361f FREQUENCY (Hz) –80 –20 –10 –90 –100 –30 –60 –40 –50 –70 0 6M 12M 18M 24M 30M 37361 F01a –110 RBW = 3kHz OPERATIO (Refer to Functional Diagram) operation enabled) with VIN = 5V, VOUT = 2.5V and IOUT = 1A. Note the significant reduction in peak output noise (>20dBm). Short-Circuit Protection When an output is shorted to ground (VFB < 0.12V), the switching frequency of that controller is reduced to 1/5 of the normal operating frequency. The other controller is unaffected and maintains normal operation. The short-circuit threshold on VFB2 is based on the smaller of 0.12V and a fraction of the voltage on the TRACK pin. This also allows VOUT2 to start up and track VOUT1 more easily. Note that if VOUT1 is truly short-circuited (VOUT1 = VFB1 = 0V), then the LTC3736-1 will try to regulate VOUT2 to 0V if a resistor divider on VOUT1 is connected to the TRACK pin. Figure 1a. Output Noise Spectrum of Conventional Buck Switching Converter (LTC3736-1 with Spread Spectrum Disabled) Showing Fundamental and Harmonic Frequencies FREQUENCY (Hz) –80 –20 –10 –90 –100 –30 –60 –40 –50 –70 37361 F01b –110 RBW = 30Hz 410k 450k 490k 530k 570k 610k Figure 1b. Zoom-In of Fundamental Frequency of Conventional Buck Switching Converter FREQUENCY (Hz) –80 –20 –10 –90 –100 –30 –60 –40 –50 –70 0 6M 12M 18M 24M 30M 37361 F01c –110 RBW = 3kHz Figure 1c. Output Noise Spectrum of the LTC3736-1 Spread Spectrum Buck Switching Converter. Note the Reduction in Fundamental and Harmonic Peak Spectral Amplitude Compared to Figure 1a. FREQUENCY (Hz) –80 –20 –10 –90 –100 –30 –60 –40 –50 –70 37361 F01d –110 RBW = 30Hz 410k 450k 490k 530k 570k 610k Figure 1d. Zoom-In of Fundamental Frequency of the LTC3736-1 Spread Spectrum Switching Converter. Note the >20dB Reduction in Peak Amplitude and Spreading of the Frequency Spectrum (Between Approximately 450kHz and 580kHz) Compared to Figure 1b. Output Overvoltage Protection As a further protection, the overvoltage comparator (OV) guards against transient overshoots, as well as other more serious conditions that may overvoltage the output. When the feedback voltage on the VFB pin has risen 13.33% above the reference voltage of 0.6V, the external P-chan- nel MOSFET is turned off and the N-channel MOSFET is turned on until the overvoltage is cleared. Frequency Selection (FREQ Pin) (Spread Spectrum Operation Disabled) The switching frequency of the LTC3736-1 can be selected using the FREQ pin when spread spectrum operation is disabled (SSDIS = VIN). |
Similar Part No. - LTC3736-1_15 |
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Similar Description - LTC3736-1_15 |
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