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AS1341-BTDT Datasheet(PDF) 10 Page - ams AG |
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AS1341-BTDT Datasheet(HTML) 10 Page - ams AG |
10 / 16 page www.austriamicrosystems.com Revision 1.00 10 - 16 AS1341 Data Sheet - A p p l i c a t i o n I n f o r m a t i o n 9 Application Information Adjusting Output Voltage The AS1341 feedback input features dual-mode operation. Connect FB to GND for the 5.0V preset output voltage. Adjust the output voltage by connecting a voltage-divider from the output to GND (Figure 4). Figure 22. Adjustable Output Voltage Circuit Select a value for R2 between 10k and 1M Ω. Calculate R1 as: Where: VFB = 1.25V. VOUTPUT may range from 1.25V to VIN. Setting Current Limit The AS1341 adjustable peak current limit is set by connecting ILIMIT as shown in Table 4. The current limit chosen should reflect the maximum load current. The maximum output current is half of the peak cur- rent limit. Choosing a lower current limit allows using an inductor with a lower current rating, however, it requires a higher inductance (see Inductor Selection on page 10) and does not allow for reduced inductor package size. Inductor Selection The AS1341 operates with a wide range of inductance values. For most applications, values between 10µH and 47µH work best with the controller’s high switching frequency. Larger inductor values will reduce the switching frequency and thereby improve efficiency and EMI. Note: The four key factors in inductor selection are inductance value, saturation rating, series resistance, and size. Table 4. Setting Peak Current Limit Current Limit ILIMIT Connected To 700mA GND 1400mA IN 4.5 to 20V 5 IN 7 SHDNN 4 LX 8 OUT CIN 1.25V to VIN 2 GND 6 ILIMIT 1 FB D1 L1 COUT + R2 R1 Indicates High-Power Trace AS1341 3 POK RPULL (EQ 2) R1 R2 VOUT VFB -------------- 1 – ⎝⎠ ⎛⎞ ⋅ = |
Similar Part No. - AS1341-BTDT |
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Similar Description - AS1341-BTDT |
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