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CS5165HGDW16 Folha de dados(PDF) 8 Page - Cherry Semiconductor Corporation |
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CS5165HGDW16 Folha de dados(HTML) 8 Page - Cherry Semiconductor Corporation |
8 / 20 page threshold, the GateH output is activated, and the Soft Start Capacitor begins charging. The GateH output will remain on, enabling the NFET switch, until terminated by either the PWM Comparator, or the Maximum On-Time Timer. If the Maximum On-Time is exceeded before the regulator output voltage achieves the 1V level, the pulse is terminat- ed. The GateH pin drives low, and the GateL pin drives high for the duration of the Extended Off-Time. This time is set by the Time-out Timer and is approximately equal to the Maximum On-Time, resulting in a 50% Duty Cycle. The GateL Pin will then drive low, the GateH pin will drive high, and the cycle repeats. When regulator output voltage achieves the 1V level pre- sent at the Comp pin, regulation has been achieved and normal Off-Time will ensue. The PWM comparator termi- nates the switch On-Time, with Off-Time set by the COFF Capacitor. The V2™ control loop will adjust switch Duty Cycle as required to ensure the regulator output voltage tracks the output of the Error Amp. The Soft Start and Comp capacitors will charge to their final levels, providing a controlled turn-on of the regulator output. Regulator turn-on time is determined by the Comp capacitor charging to its final value. Its voltage is limited by the Soft Start Comp clamp and the voltage on the Soft start pin. Power Supply Sequencing The CS5165H offers inherent protection from undefined start-up conditions, regardless of the 12V and 5V supply power-up sequencing. The turn-on slew rates of the 12V and 5V power supplies can be varied over wide ranges without affecting the output voltage or causing detrimental effects to the buck regulator. Figure 2: Demonstration board start up in response to increasing 12V and 5V input voltages. Extended off time is followed by normal off time operation when output voltage achieves regulation to the error amplifier output. Figure 3: Demonstration board start up waveforms. Figure 4: Demonstration board enable start up waveforms. Normal Operation During Normal operation, Switch Off-Time is constant and set by the COFF capacitor. Switch On-Time is adjusted by the V2™ Control loop to maintain regulation. This results in changes in regulator switching frequency, duty cycle, and output ripple in response to changes in load and line. Output voltage ripple will be determined by inductor rip- ple current and the ESR of the output capacitors (see fig- ures 5 & 6 ). Trace 1 - Regulator Output Voltage (1V/div.) Trace 2 - Inductor Switching Node (5V/div.) Trace 1 Soft Start pin (2V/div) Trace 2 COMP pin (error amplifier output) (1V/div) Trace 4 Regulator output voltage (1V/div) Trace 1 - Regulator Output Voltage (1V/div.) Trace 2 - Inductor Switching Node (2V/div.) Trace 3 - 12V input (VCC) (5V/div.) Trace 4 - 5V Input (1V/div.) 8 Application Information: continued |
Nº de peça semelhante - CS5165HGDW16 |
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Descrição semelhante - CS5165HGDW16 |
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