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PDF MA5602 Data sheet ( Hoja de datos )
| Número de pieza | MA5602 | |
| Descripción | 38V Synchronous Buck Converter | |
| Fabricantes | Major Power Technology | |
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Hay una vista previa y un enlace de descarga de MA5602 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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MA5602 (Preliminary)
38V Synchronous Buck Converter With CC/CV
GENERAL DESCRIPTION
MA5602 is a wide input voltage, high efficiency Active CC step-down DC/DC converter that
operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode.
MA5602 provides up to 2.5A output current at 180kHz switching frequency. Current mode control
provides fast transient response and cycle-by-cycle current limit.
An internal soft-start prevents inrush current at turn-on, This device, available in an
SOP8L-EP(Exposed pad) package, provides a very compact solution with minimal external
components.
FEATURES
- Wide 8V to 38V Operating Input Range
- Integrated 140mΩ Power MOSFET Switches
- Output Adjustable from VFB(1.0V) to 5.5V
- Up to 92% Efficiency
- Internal Soft-Start.
- Stable with Low ESR Ceramic Output Capacitors
- Fixed 180KHz Frequency
- Cycle-by-Cycle Over Current Protection
- Input Under Voltage Lockout
APPLICATION CIRCUIT
VOUT=VFB × (1+R1/R2), VFB = 1.00V, R2 suggest 10k~30KΩ
ISEN = VSET / RSEN-ΔI/2 ≒120mV / 50mΩ-0.2A = 2.2A
Major Power Technology Co., Ltd.
1/6
Rev.0.5 Apr.08, 2014
1 page  
MA5602 (Preliminary)
FUNCTION DESCRIPTIONS
The MA5602 is a synchronous rectified, current-mode, step-down regulator. It regulates
input voltages from 8V to 38V down to an output voltage as low as VFB, and supplies up to 2.5A of
load current.
The MA5602 uses current-mode control to regulate the output voltage. The output voltage is
measured at FB through a resistive voltage divider and amplified through the internal Tran
conductance error amplifier.
The converter uses internal N-Channel MOSFET switches to step-down the input voltage to
the regulated output voltage. Since the high side MOSFET requires a gate voltage greater than
the input voltage, a boost capacitor connected between SW and BS is needed to drive the high
side gate. The boost capacitor is charged from the internal 5V rail when SW is low.
When the MA5602 FB pin exceeds 10% of the nominal regulation voltage of VFB, the over
voltage comparator is tripped and the COMP pin is discharged to GND, forcing the high-side
switch off.
APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The output voltage is set using a resistive voltage divider from the output voltage to FB pin.
The voltage divider divides the output voltage down to the feedback voltage by the ratio.
Thus the output voltage is:
VOUT=
VFB
×
R1 R2
R2
For example, VFB =1.00V for a 5.0V output voltage, R2 is 10kΩ, and R1 is 40kΩ.
Inductor Selection
The inductor is required to supply constant current to the output load while being driven by
the switched input voltage. A larger value inductor will result in less ripple current that will result in
lower output ripple voltage. However, the larger value inductor will have a larger physical size,
higher series resistance, and/or lower saturation current. A good rule for determining the
inductance to use is to allow the peak-to-peak ripple current in the inductor to be approximately
30% of the maximum switch current limit.
VIN <24V <28V <34V
Inductor
47uH
33uH
22uH
The choice of which style inductor to use mainly depends on the price vs. size requirements
and any EMI requirements.
Major Power Technology Co., Ltd.
5/6
Rev.0.5 Apr.08, 2014
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet MA5602.PDF ] | |
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