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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC3543 датащи(PDF) 10 Page - Linear Technology |
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LTC3543 датащи(HTML) 10 Page - Linear Technology |
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10 / 20 page  LTC3543 10 3543fa An important detail to remember is that at low input supply voltages, the RDS(ON) of the P-channel switch increases (see the Typical Performance Characteristics section). Therefore, the user should calculate the power dissipation when the LTC3543 is used at 100% duty cycle with low input voltage (see Thermal Considerations in the Applica- tions Information section). Low Supply Operation The LTC3543 will operate with input supply voltages as low as 2.5V, but the maximum allowable output current is reduced at this low voltage. Figure 2 shows the reduc- tion in the maximum output current as a function of input voltage for various output voltages. Figure 2. Maximum Output Current vs Input Voltage (VIN) INPUT VOLTAGE (V) 2.5 500 700 900 1100 3.0 3.5 4.0 4.5 3543 F02 5.0 1300 1500 600 800 1000 1200 1400 5.5 VOUT = 1.5V VOUT = 1.2V OPERATION Slope Compensation and Inductor Peak Current Slope compensation provides stability in constant- frequency architectures by preventing subharmon- ic oscillations at high duty cycles. It is accomplished internally by adding a compensating ramp to the inductor current signal at duty cycles in excess of 40%. Normally, this results in a reduction of maximum inductor peak current for duty cycles >40%; however, the LTC3543 uses a patent pending scheme that counteracts this compensating ramp, allowing the maximum induc- tor peak current to remain unaffected throughout all duty cycles. |
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