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AS1364-BTDT-30 Datasheet(PDF) 9 Page - ams AG |
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AS1364-BTDT-30 Datasheet(HTML) 9 Page - ams AG |
9 / 15 page www.austriamicrosystems.com Revision 1.05 9 - 15 AS1364 Datasheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description The AS1364 output voltage is factory-trimmed or is adjustable from +1.2 to +5V, and is guaranteed to supply 1A of out- put current. The device consists of a +1.20V internal reference, error amplifier, MOSFET driver, P-channel pass tran- sistor, internal feedback voltage-divider and a comparator (see Figure 16). Figure 16. AS1364 - Block Diagram The +1.20V reference is connected to the inverting input of the error amplifier, which compares this reference with the selected feedback voltage and amplifies the difference. The MOSFET driver reads the error signal and applies the appropriate drive to the P-channel transistor. If the feedback voltage is lower than the reference, the pass transistor gate is pulled lower, allowing more current to pass increasing the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled up, allowing less current to pass to the output. The low VOUT comparator senses when the feedback voltage has dropped 6% below its expected level, causing POK to go low. The output voltage is fed back through either an internal resistor-divider connected to OUT or an external resistor net- work connected to SET. The comparator examines VSET/BYP and selects the feedback path. If VSET/BYP is below 50mV, the internal feedback path is used and the output is regulated to the factory-preset voltage. AS1364 + – Shutdown Logic + – 94%VREF + – 100mV + – R1 COUT 4.7µF R2 + – RPOK 100kΩ MOSFET Driver w/ILIM Thermal Sensor 4 IN 6 OUT 2 EN 1 POK 7 SET/BYP 8 GND CIN 4.7µF VIN 2.0V to 5.5V VOUT Logic Supply Voltage To Controller Error Amplifier On Off 1.20V Reference VOUT 1.2V to 5.0V 3 IN 5 OUT |
Similar Part No. - AS1364-BTDT-30 |
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Similar Description - AS1364-BTDT-30 |
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