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CS5157GDR16 データシート(PDF) 7 Page - Cherry Semiconductor Corporation |
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CS5157GDR16 データシート(HTML) 7 Page - Cherry Semiconductor Corporation |
7 / 14 page 7 Applications Information: continued normal off time will ensue. The PWM comparator termi- nates the switch on time, with off time set by the COFF capacitor. The V2 TM control loop will adjust switch duty cycle as required to ensure the regulator output voltage tracks the output of the error amplifier. 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 (see Figures 2 and 3). Figure 2: CS5157 demonstration board startup 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: CS5157 demonstration board startup waveforms. If the input voltage rises quickly, or the regulator output is enabled externally, output voltage will increase to the level set by the error amplifier output more rapidly, usually within a couple of cycles (see Figure 4). Figure 4: CS5157 demonstration board enable startup 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 TM 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 working into the ESR of the output capacitors (see Figures 5 and 6). Figure 5: Peak-to-peak ripple on VOUT = 2.8V, IOUT = 0.5A (light load). Trace 1 - Regulator Output Voltage (10mV/div.) Trace 2 - Inductor Switching Node (5V/div.) Trace 1 - Regulator Output Voltage (5V/div.) Trace 2 - Inductor Switching Node (5V/div.) Trace 1 - Regulator Output Voltage (1V/div.) Trace 3 - COMP Pin (error amplifier output) (1V/div.) Trace 4 - Soft Start Pin (2V/div.) Ch1 High 2.80V Trace 1 - Regulator Output Voltage (1V/div.) Trace 2 - Inductor Switching Node (2V/div.) Trace 3 - 12V input (VCC1 and VCC2) (5V/div.) Trace 4 - 5V Input (1V/div.) |
同様の部品番号 - CS5157GDR16 |
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同様の説明 - CS5157GDR16 |
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