| Part Numbert | Mfg | Packt | D/C | Descriptiont | Qty | Company/Contact |
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SIL9021 Datasheet SYNC Input and Frequency Control The MAX887H comes with an internal oscillator set for a fixed switching frequency of 300kHz. Connect SYNC to VL for normal forced-PWM operation. Do not leave SYNC floating. Connecting SYNC to GND enables Idle Mode operation to reduce supply current at light loads. SIL9021 Price
SIL9021 on stock Holding tolerance to lcr/o allows the error amplifier's refer- ence voltage to be targeted +40mV high without compro- mising DC accuracy. A "droop resistor", implemented through a PC board trace, connects the error amplifier's feedback pin (VFB) to the output capacitors and load and carries the output current. With no load, there is no DC drop across this resistor, producing an output voltage tracking the error amplifier's, including the +40mV offset. When the fullload current is delivered, an 80mV drop is developed across this resistor. This results in output volt- age being offset -40mV low. The result of adaptive voltage positioning is that additional margin is provided for a load transient before reaching the output voltage specification limits. When load current sud- denly increases from its minimum level, the output capaci- tor is pre-positioned +40mV. Conversely, when load cur- rent suddenly decreases from its maximum level, the out- put capacitor is pre-positioned -40mV (see Figures 7, 8, and 9). For best transient response, a combination of a number of high frequency and bulk output capacitors are usually used. Input capacitor - Semtech recommends the use of a 11JF ceramic capacitor at the input. This allows for the device being some distance from any bulk capacitance on the rail. Additionally, input droop due to load transients is reduced, improving overall load transient response. |
