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LT1510CS Datasheet(PDF) 8 Page - Linear Technology |
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LT1510CS Datasheet(HTML) 8 Page - Linear Technology |
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8 / 16 page  8 LT1510/LT1510-5 TEST CIRCUITS VREF 2.465V – + VA + 10k 10k OVP 1510 TC02 IPROG RPROG LT1510 PROG LT1013 0.47 µF Test Circuit 2 OPERATIO The LT1510 is a current mode PWM step-down (buck) switcher. The battery DC charging current is programmed by a resistor RPROG (or a DAC output current) at the PROG pin (see Block Diagram). Amplifier CA1 converts the charging current through RS1 to a much lower current IPROG (500µA/A) fed into the PROG pin. Amplifier CA2 compares the output of CA1 with the programmed current and drives the PWM loop to force them to be equal. High DC accuracy is achieved with averaging capacitor CPROG. Note that IPROG has both AC and DC components. IPROG goes through R1 and generates a ramp signal that is fed to the PWM control comparator C1 through buffer B1 and level shift resistors R2 and R3, forming the current mode inner loop. The Boost pin drives the switch NPN QSW into saturation and reduces power loss. For batteries like lithium-ion that require both constant-current and con- stant-voltage charging, the 0.5%, 2.465V reference and the amplifier VA reduce the charging current when battery voltage reaches the preset level. For NiMH and NiCd, VA can be used for overvoltage protection. When input volt- age is not present, the charger goes into low current (3 µA typically) sleep mode as input drops down to 0.7V below battery voltage. To shut down the charger, simply pull the VC pin low with a transistor. APPLICATIONS INFORMATION Application Note 68, the LT1510 design manual, contains more in depth appications examples. Input and Output Capacitors In the chargers in Figures 1 and 2 on the first page of this data sheet, the input capacitor CIN is assumed to absorb all input switching ripple current in the converter, so it must have adequate ripple current rating. Worst-case RMS ripple current will be equal to one half of output charging current. Actual capacitance value is not critical. Solid tantalum capacitors such as the AVX TPS and Sprague 593D series have high ripple current rating in a relatively small surface mount package, but caution must be used when tantalum capacitors are used for input bypass. High input surge currents can be created when the adapter is hot-plugged to the charger and solid tantalum capacitors have a known failure mechanism when subjected to very high turn-on surge currents. Highest possible voltage rating on the capacitor will minimize problems. Consult with the manufacturer before use. Alternatives include new high |
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