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PDF AX5104 Data sheet ( Hoja de datos )
| Número de pieza | AX5104 | |
| Descripción | Step-up PWM DC/DC Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX5104
Step-up PWM DC/DC Converter
GENERAL DESCRIPTION
The AX5104 is high efficient step-up DC/DC converter. Large output current is
possible having a built in internal transistor, and using an external coil and diode. The
converter can be operated at switching frequencies of 800KHz allowing for easy filtering
and low noise, the size of the external components can be reduced. Output voltage is
programmable with 1.0V of standard voltage supply internal, and using externally
connected components, output voltage (FB) can be set up at will.
The AX5104 is external soft-start function that prevents inrush-current and
overshooting at startup, soft-start time is be set up by outside capacitance. An enable
function, current limit, over voltage protection (OVP) and thermal shutdown functions are
built inside.
FEATURES
- Input voltage: 4V to 23V
- Output voltage: 4.5V to 25V
- Duty ratio: 0% to 83% PWM control
- Maximum switch current is 1.8A
- Oscillation frequency: 800 KHz (typ.)
- Current limit and thermal shutdown functions
- External soft-start function
- Over voltage protection (OVP)
- Built-in internal Transistor
- SOP-8L with Expose-Pad (EP) Pb-Free Package.
1/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Aug.09, 2010
1 page  
AX5104
FUNCTION DESCRIPTIONS
PWM Control
The AX5104 consists of DC/DC converters that employ a pulse-width modulation
(PWM) system. In converters of the AX5104, the pulse width varies in a range from 0 to
83%, according to the load current. The ripple voltage produced by the switching can easily
be removed through a filter because the switching frequency remains constant. Therefore,
these converters provide a low-ripple power over broad ranges of input voltage and load
current.
Soft Start
The soft start time is set by outside capacitor (C1). There is 4uA soft start current to
charge C1, the real soft-start time is depend on SS voltage from 0.4 to 1V.
Current Limiting
The current limit threshold is setting by the internal circuit.
Over Voltage Protection (OVP)
The OVP function is preventing VOUT overshooting for system unusually working (R1
floating, LED burn-out for LED application.) The OVP voltage is set by output resistance,
please refer the following equation:
V OVP
VSENSE
1
R4
R5
,
VSENSE=1V,
R5
suggest
1K~10KΩ
If VSENSE>1V and SS voltage is more than 1V, The OVP is happened, the driver is
turned off until VSENSE<1V. However, the OVP function can keep VOUT to VOVP voltage.
If the OVP function is not used, please connect the sense pin to ground.
5/9
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Aug.09, 2010
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet AX5104.PDF ] | |
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