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PDF PT1101E23E-10 Data sheet ( Hoja de datos )
| Número de pieza | PT1101E23E-10 | |
| Descripción | PWM/VFM Step-down DC-DC Controller | |
| Fabricantes | PowTech | |
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PT1101
PWM/VFM Step-down DC-DC Controller
GENERAL DESCRIPTION
The PT1101 Series are CMOS-based PWM step-down DC/DC Controllers with low supply current. A low ripple, high
efficiency step-down DC/DC converter can be easily composed of with additional several external components such as a
power-transistor, an inductor, a diode and capacitors. Output voltage is fixed or can be adjusted with external resisters.
(PWM/VFM alternative circuit is disabled in adjustable types)
The PT1101 Series consist of a PWM control circuit, a high precision band-gap voltage reference, a soft-start circuit, a
protection circuit, a PWM/VFM alternative circuit, an oscillator, an error amplifier with internal compensation network and
input/output voltage detection circuits.
With its internal state-of-art control algorithm, the PT1101 Series based DC/DC converter can achieve high performance
while maintaining stability. For example, with its PWM/VFM alternative circuit, when the load current is small, the operation
is automatically switched into the VFM mode to improve the efficiency. Further, if the term of maximum duty cycle keeps on
a certain time, the embedded protection circuits restart the operation with soft-start and repeat until the maximum duty
cycle condition is released. Finally, built-in UVLO function blocks potentially unstable output when the input voltage is equal
or less than UVLO threshold and makes this IC standby for low power consumption.
FEATURES
APPLICATIONS
Wide Range Of Input Voltage: 2.3V~18V
Built-in Soft-start and Protection Function
High Efficiency: Typ. 90%
Oscillation Frequency: 500kHz
High Accuracy Output Voltage: ±2%
Low Temperature Coefficient of Output Voltage:
Typ. ±100ppm/℃
Standby Current: Typ. 0.1µA
Output Voltage: Stepwise Setting with a step of
0.1V in the range of 1.2V to 6.0V as fixed voltage
type. Reference Voltage of Adjustable type is 1.0V.
CMOS Output Capability
Small Package: SOT-23-5
Power Sources For:
Hand-held communication equipment, cameras,
video instruments such as VCRs, camcorders
Battery-powered equipment
Household electrical appliances
ORDERING INFORMATION
Package
SOT-23-5,
Pb-free
Temperature Range
-40℃ to 125℃
Ordering Part Number
PT1101E23E-10 (Adjustable Output Voltage)
PT1101E23E-33 (3.3V Output Voltage)
PT1101E23E-50 (5.03V Output Voltage)
Transport
Tape and Reel
Tape and Reel
Tape and Reel
Marking
1101
1101C
1101D
Datasheet Rev 1.0, China Resources Powtech (Shanghai) Limited
Page 1
1 page  
PT1101
PWM/VFM Step-down DC-DC Controller
SIMPLIFIED BLOCK DIAGRAM
PWM
Ramp
errAmp
Vref
Vref
PWM
Ramp
errAmp
Vref
Vref
Fixed Output Voltage Type
Adjustable Output Voltage Type
OPERATION DESCRIPTION
The power stage of PWM step-down DC/DC converter can be seen as an input voltage chopping circuit followed by an L-C
filter. Unlike the linear regulator which operates the power transistor in the linear mode, the PWM switching regulator
operates the power transistor either in saturation or cutoff regions. Due to the voltage-ampere product of power transistor
under these two operation modes keeps low, high efficiency can be easily achieved.
The DC input voltage is firstly chopped into square waves whose magnitude is the same as input voltage and whose duty
cycle is manipulated by the switching regulator controller, hereby is PT1101. With the use of following appropriately chosen
L-C filter, such square wave modulation could be eliminated and ripple free DC voltage equal to the average of the duty
cycle modulated DC input voltage results. The regulated output voltage is maintained by the controller, which operates
much like a linear style controller. That is, by sensing the DC output and controlling duty cycle in a negative-feedback loop,
the DC output could be regulated against input line and output load changes.
The operation of step-down DC/DC converter can be understood by braking its operation into two period. When the switch
is turned on, the input voltage is presented to the L-C filter, the inductor current (i1) ramps linearly upward from ILmin to
ILmax and stores energy in itself. When the switch is turned off, the input voltage to inductor flies below ground and the
schottky diode becomes forward biased. This continues to conduct current (i2) which is formerly flowing through switch and
some of the stored energy is discharged to load. Therefore a local current loop including diode, inductor and load comes
into being.
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Datasheet Rev 1.0, China Resources Powtech (Shanghai) Limited
Page 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet PT1101E23E-10.PDF ] | |
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