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參數(shù)資料
| 型號： | AT1308 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Preliminary Product Information Micro-Power Step up DC-DC Converter |
| 中文描述： | 初步產(chǎn)品信息微功率升壓DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 377K |
| 代理商： | AT1308 |
AT1308
Preliminary Product Information
Micro-Power Step up DC-DC Converter
Function Description
The AT1308 is designed primarily for use in STN/OLED bias applications. The output voltage of the
step-up converter can be set from Vin to 26V with external resistive voltage divider. The boost
converter operates in current-mode PWM and a constant frequency of 1.0 MHz. Depending on duty
cycle of each switching cycle can regulate output voltage. On the rising edge of the internal clock, the
control and driver logic block sets internal flip-flop when the output voltage is too low, which turns on
the N-MOS . The external inductor current ramps up linearly, storing energy in a magnetic filed. Once
peak current of inductor over trans-conductance output level , the N-MOS turns off, the flip-flop resets,
and external schottky diode turns on . This forces the current through the inductor to ramp back down,
transferring the energy stored in the magnetic field to the output capacitor and load. To reduce external
component amount, the device will be built-in internal loop compensation.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879 Email:
service@aimtron.com.tw
12
Rev A ; 01/18/05
Enable Control
Digital logic of EN provides an electrical ON/OFF control of the power supply. Connecting this pin to
ground or to any voltage less than 0.7V will completely turn off the regulator. In this state, current
drain from the input supply is less than 1uA , the internal reference, error amplifier, comparators, and
biasing circuitry turn off .
EN works as a simple on/off control. Drive EN high to enable the device, or drive EN low for
shutdown.
Soft-Start
Soft-start allows a gradual increase of the internal current-limit level for the step-up converter during
power-up to reduce input surge currents. As the internal current source charges the internal soft-start
capacitor, the peak N-MOS current is limited by the voltage on the capacitor.
Cycle-by-Cycle Over-Current Protection
The AT1308 provides cycle-by-cycle over-current protection. Current limit is accomplished using a separate
dedicated comparator. The cycle-by-cycle current limit abbreviates the on-time of the N-MOS in event that
the current of flowing N-MOS is greater than the current limit value. The current-limit feature protection
against a hard short or over-current fault at the output.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation in the AT1308. When the junction
temperature exceeds Tj=130
℃
, a thermal sensor activates the thermal protection, which shuts down
the IC, allowing the IC to cool. Once the device cools down by 10
℃
, IC will automatically recover
normal operation. For continuous operation , do not exceed the absolute maximum
junction-temperature rating of Tj=120
℃
.
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