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ILC6363 датащи(PDF) 7 Page - Fairchild Semiconductor |
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ILC6363 датащи(HTML) 7 Page - Fairchild Semiconductor |
7 / 14 page PRODUCT SPECIFICATION ILC6363 REV. 1.3.5 5/21/02 7 When the ILC6363 is shut down, the synchronous rectifier disconnects the output from the input. This ensures that there is only leakage (IIN < 1µA typical) from the input to the out- put so that the battery is not drained when the ILC6363 is shut down. Figure 8. Shut Down Control Power Good Output (POK) The POK output of the ILC6363 indicates when VOUT is within the regulation tolerance of the set output voltage. POK output is an open drain device output capable of sink- ing 2mA. It will remain pulled low until the output voltage has risen to typically 95% of the specified VOUT. Note that a pull-up resistor must be connected from the POK output (pin 5 of ILC6363CIR-XX) to either ILC6363’s output or to some other system voltage source. Adjustable Output Voltage Selection The ILC6363-ADJ allows the output voltage to be set using a potential divider. The formula for setting the adjustable output voltage is; VOUT = VFB x (1+R1/R2), R1+R2 ≤ 100kΩ Where VFB is the threshold set which is 1.25V nominal. Figure 9. Adjustable Voltage Configuration Negative Voltage Output It is possible to generate a negative output voltage as a secondary supply using the ILC6363. This negative voltage may be useful in some applications where a negative bias voltage at low current is required. Figure 10. Negative Output Voltage External Component Selection Inductors The ILC6363 is designed to work with a 15µH inductor in most applications. There are several vendors who supply standard surface mount inductors to this value. Suggested suppliers are shown in table 1. Higher values of inductance will improve efficiency, but will reduce peak inductor current and consequently ripple and noise, but will also limit output current. Capacitors Input Capacitor The input capacitor is necessary to minimize the peak current drawn from the battery. Typically a 100µF tantalum capacitor is recommended. Low equivalent series resistance (ESR) capacitors will help to minimize battery voltage ripple. Output Capacitor Low ESR capacitors should be used at the output of the ILC6363 to minimize output ripple. The high switching speeds and fast changes in the output capacitor current, mean that the equivalent series impedance of the capacitor can contribute greatly to the output ripple. In order to minimize these effects choose an output capacitor with less than 10nH of equivalent series inductance (ESL) and less than 100m Ω of equivalent series resistance (ESR). Typically these characteristics are met with ceramic capacitors, but may also be met with certain types of tantalum capacitors. Suitable vendors are shown in the following table. ON/OFF R5 R6 LBI/SD 3 ILC6363 2 VIN 7 GND 100 µF ON OFF VIN 1 to 3-cell R5 R6 15mH L 100 µF COUT R1 R2 ILC6363-ADJ MSOP-8 LX VIN LBI/SD SEL GND LBO VFB VOUT VOUT VOUT = 1.25 (1+R1/R2) 1 2 3 4 8 7 6 5 CIN + PWM PFM Vendor Part Number Contact Coilcraft D03316P-153 D01608C-153 (847) 639-6400 muRata LQH4N150K LQH3C150K (814) 237-1431 Sumida CDR74B-150MC CD43-150 CD54-150 (847) 956-0666 TDK NLC453232T-150K (847) 390-4373 1 2 L LX VIN ILC6363 0.01 µF 0.01 µF -V 1A Schottky Diodes VIN |
Аналогичный номер детали - ILC6363 |
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Аналогичное описание - ILC6363 |
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