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PDF AAT1109 Data sheet ( Hoja de datos )
| Número de pieza | AAT1109 | |
| Descripción | ONE-CHANNEL STEP-UP PWM CONTROLLER | |
| Fabricantes | Advanced Analog Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AAT1109 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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Advanced Analog Technology, Inc.
Details are subject to change without notice.
AAT1109
ONE-CHANNEL STEP-UP PWM CONTROLLER
FEATURES
www.DataShzeet4UU.cnodmer-Voltage Lockout (UVLO) Protection
z Totem Pole Output
z Output Short Circuit Protection
z Soft-Start Function
z Wide Operating Frequency
10 kHz to 1MHz
z Shutdown Control
z Low Dissipation Current :
Typical 1.6mA in Operation
z SOP-8 & TSSOP-8 Package Available
PIN CONFIGURATION
GENERAL DESCRIPTION
The AAT1109 is a one-channel step-up PWM
controller incorporating a soft-start and a short
circuit protection (SCP) function.
This device consists of an on-chip voltage reference,
error amplifier, pulse width modulation controller,
under-voltage lockout protection, soft-start, and
short circuit protection circuits. Switching
frequency up to 1MHz is set by an external resistor
and capacitor. Soft-start time can be implemented
by the SCP capacitor.
Additionally, a chip-enable feature is also provided
to power down and reduce the current supply
to10µA . With the minimal external components,
the AAT1109 offers a simple and economical
solution.
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– Advanced Analog Technology, Inc. –
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Advanced Analog Technology, Inc.
AAT1109
HOW TO SET THE TIME CONSTANT FOR SOFT-START AND SHORT
CIRCUIT PROTECTION
1. Soft-Start
AAT1109 operates in soft-start mode. The PWM comparator monitors the voltage at soft-start setting
www.DataSheeta4Un.dcoSmCP pin, which varies proportionally to each other. This proportion relation controls the ON duty
of the OUT pin and activates the soft-start operation. In the Soft-start mode, the voltage at SCP pin
( VSCP ) is input to the PWM comparator, so that the ON duty of the OUT pin is determined by the VSCP .
When the soft-started mode is completed, its setting voltage remains high and the circuit enters the
output short circuit protection wait state while VSCP remains low.
Soft-Start Time
ts (sec) ~ 0.84 × CSCP (µF)
2. Short Circuit Protection
In response to a sudden drop of the switching regulator output, the device locks the error amplifier, OE
pin, at VOS+ , and starts feeding currents into the capacitor at SCP pin to achieve in a voltage value of
approximately 0.84V at this pin. This chain reaction protects the circuit by keeping the SCP pin and
output pin low. Users could reverse this process by restarting the device.
Short Circuit Detection Time
tSCP (sec) ~ 0.84 × CSCP (µF)
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– Advanced Analog Technology, Inc. –
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Advanced Analog Technology, Inc.
TAPE AND REEL
8-PIN SOP
AAT1109
www.DataSheet4U.com
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– Advanced Analog Technology, Inc. –
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| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AAT1109.PDF ] | |
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