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PDF L2800 Data sheet ( Hoja de datos )

Número de pieza L2800
Descripción SWITCHING REGULATOR CONTROLLER
Fabricantes Unisonic Technologies 
Logotipo Unisonic Technologies Logotipo



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No Preview Available ! L2800 Hoja de datos, Descripción, Manual

UNISONIC TECHNOLOGIES CO., LTD
L2800
LINEAR INTEGRATED CIRCUIT
SWITCHING REGULATOR
CONTROLLER(LOW VOLTAGE)
DESCRIPTION
The UTC L2800 which is incorporating a soft start function and
short circuit detection function is a single-channel switching
regulator control IC and is made for low voltage applications.
Because the device has a low minimum operating voltage of 1.8V,
so it is ideal for the power supply of battery-operated electronic
equipment.
FEATURES
*Wide supply voltage operating range: 1.8V~15V
*Low current consumption: Typically 5.5mA in operation,1μA or
less in stand-by
*High speed operation is possible: Maximum 1MHz
*The error amplifier gain is set inside the IC, so peripheral
components are minimized.
*Incorporates a soft start circuit.
*Incorporates a timer-latch type short circuit detection circuit (SCP).
*Totem-pole type output with adjustable on/off current (for NPN
transistors)
*Incorporates a stand-by function.
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
L2800L-S08-T
L2800G-S08-T
L2800L-S08-R
L2800G-S08-R
L2800L-P08-T
L2800G-P08-T
L2800L-P08-R
L2800G-P08-R
Package
SOP-8
SOP-8
TSSOP-8
TSSOP-8
SOP-8
TSSOP-8
Packing
Tube
Tape Reel
Tube
Tape Reel
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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L2800 pdf
L2800
DIAGRAM
LINEAR INTEGRATED CIRCUIT
HOW TO SET THE TIME CONSTANT FOR SHORT CIRCUIT DETECTION AND SOFT
START
1. SHORT CIRCUIT PROTECTION
Te error amplifier output (FB pin) is fixed at VOM+ and capacitor CPE starts charging i the switching regulator
output suddenly drops due to load effect. The output pin is set low and the SCP pin stays low when the voltage at
the SCP pin reaches approximately 0.8V.
As the protection circuit operates, by resetting the power supply the circuit will be restored.
•Short circuit detection time
tPE[S]0.8×CPE[μF]
2. SOFT START
Once power on, the capacitor CPE which is connected to the SCP pin starts charging.The soft start setting
voltage is compared by the PWM comparator as the voltage’s proportion at the SCP pin with the sawtooth
waveform. The comparison controls the OUT pin’s ON duty,which is causing the soft start operation. During the
time for completion of soft start operation, the SCP pin’s voltage stays low, but the soft start setting voltage stays
high, and the circuit then enters the output short circuit detection wait state.
Soft start time (until the output ON duty reaches approximately 50%)
ts[S]0.35×CPE[μF]
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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