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PDF AAT1109A Data sheet ( Hoja de datos )
| Número de pieza | AAT1109A | |
| Descripción | ONE-CHANNEL BOOST SWITCHING REGULATOR | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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Advanced Analog Technology, Inc.
Preliminary and Provisional
AAT1109A
ONE-CHANNEL BOOST SWITCHING REGULATOR
Features
z Under-voltage lockout protection
z Totem pole output
z Output short circuit protection
z Incorporates soft start function
z Wide operating frequency
10kHz to 1MHz
z Shut down control
z Low dissipation current :
Typical 1.6mA in operation
z Sop-8 & Tssop-8 package available
Pin Configuration
TOP VIEW
-IN 1
SCP 2
Vcc 3
CE 4
8 FB
7 OSC
6 GND
5 OUT
(SOP-8 PACKAGE)
(TSSOP-8 PACKAGE)
General Description
The AAT1109A is a one-channel switching
regulator control IC incorporating a soft start
function and a short circuit protection function.
Each device consists of an on-chip voltage reference,
error amplifier, pulse width modulation controller,
under-voltage protection, soft start and short circuit
protection circuits. Switching frequencies up to
1MHz are set by an external resistor and capacitor.
Soft-start time can be implemented by the SCP
capacitor.
Additionally, a chip enable feature is provided to
power down reducing the supply current to 10uA.
With a minimum number of external components,
the AAT1109A offers a simple and cost effective
solution.
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Advanced Analog Technology, Inc. –
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Advanced Analog Technology, Inc.
AAT1109A
How to set the time constant for soft start and short circuit protection
1.Soft start
At power on, the AAT1109A operates in soft start mode. The capacitor Cscp connected to SCP pin starts
charging at a constant current. 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 controlled by the VSCP. On completion of soft start
operation, the voltage at the SCP pin stays low, the input from soft start circuit to the PWM comparator
stay high, and enter the short circuit protection waiting state.
Soft start time
Ts(sec)
2.Short circuit protection
If the switching regulator output suddenly drops due to loading effect , the error amplifier output is fixed at
VOM+ and capacitor CSCP starts charging. When the voltage at the SCP pin reaches approximately 1.26V
,the output pin set low and SCP pin stays low.
Once the protection circuit operates, the circuit can be recovered by setting the power supply.
Short circuit detection time
Tscp(sec)
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Advanced Analog Technology, Inc. –
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5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AAT1109A.PDF ] | |
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