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PDF AX3304 Data sheet ( Hoja de datos )
| Número de pieza | AX3304 | |
| Descripción | PWM Control Controller | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX3304
PWM Control Controller
GENERAL DESCRIPTION
The AX3304/A integrates Pulse-Width-Modulation (PWM) control circuit into a single
chip, mainly designs for power-supply regulator. All the functions include an error amplifier,
a soft-start, UVLO, OVP, SCP, TSD circuitry.
This device features an internal 100KHz oscillator (300KHz for "A" version), the
UVLO makes sure that the outputs are off until the internal circuit operates normally.
FEATURES
- Input voltage：8V to 40V
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：100K/300KHz
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- External SW P-channel MOS.
- External OVP setting function.
- Current mode non-synchronous PWM converter
- External current limit setting.
- Under voltage Lockout.
- SOP-8L Pb-Free package.
1/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jun.26, 2012
1 page  
AX3304
Thermal Considerations
The SOP-8L package needs a heat sink under most conditions. The heat sink
connect exposed pad of AX3304/A to obtain best effect. The size of the heat sink depends
on the input voltage, output voltage, output current and ambient temperature.
APPLICATION INFORMATION
Setting the Output Voltage
Application circuit item shows the basic application circuit with adjustable output
version. The external resistor sets the output voltage according to the following equation:
VOUT
=
1.0V
×
(1+
R3
R6
)
Table 1 Resistor select for output voltage setting
VOUT
R6
R3
5.0V 3K
12K
3.3V 3K6
8K2
Current Limit Protection
The Current limit is set by external resistor (RSENSE), When the VSENSE pin voltage
small than VCC 115mV, the current limit is happened that driver can be turned off. Refer to
the following equation for set up current limit:
Current
Limit
(A)
=
115mV
R SENSE
The maximum output current table is shown as below; please refer the table to design.
RSENSE (Ω)
Current Limit (A)
Maximum Output Current (A)
29m 3.96
3.7
38m 3.03
3.0
54m 2.13
1.9
5/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jun.26, 2012
5 Page 
TYPICAL CHARACTERISTICS (CONTINUOUS)
AX3304
11/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jun.26, 2012
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AX3304.PDF ] | |
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