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PDF LA5735M Data sheet ( Hoja de datos )
| Número de pieza | LA5735M | |
| Descripción | Monolithic Linear IC Separately-Excited Step-Down Switching Regulator | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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Ordering number : ENA0588
LA5735M
Monolithic Linear IC
Separately-Excited Step-Down
Switching Regulator
(Variable Type)
www.DataSheetO4Uv.ceomrview
The LA5735M is a separately-excited step-down switching regulator (variable type).
Functions
• Time-base generator (300kHz) incorporated.
• Current limiter incorporated.
• Thermal shutdown circuit incorporated.
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Input voltage
Maximum output current
SW pin application reverse voltage
VOS pin application voltage
Allowable power dissipation
VIN
IO max
VSW
VVOS
Pd max
Mounted on a circuit board.*
Operating temperature
Topr
Storage temperature
Tstg
* Specified circuit board : 114.3×76.1×1.6mm3, glass epoxy board.
Recommended Operating Conditions at Ta = 25°C
Parameter
Input voltage range
Symbol
VIN
Conditions
Ratings
34
0.6
-1
-0.2 to 7
0.8
-30 to +125
-40 to +150
Ratings
4.5 to 32
Unit
V
A
V
V
W
°C
°C
Unit
V
Any and all SANYO Semiconductor products described or contained herein do not have specifications
that can handle applications that require extremely high levels of reliability, such as life-support systems,
aircraft's control systems, or other applications whose failure can be reasonably expected to result in
serious physical and/or material damage. Consult with your SANYO Semiconductor representative
nearest you before using any SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor assumes no responsibility for equipment failures that result from using products
at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor
products described or contained herein.
11707 MS PC 20061030-S00008 No.A0588-1/7
1 page  
LA5735M
Diode D1
• Low-impedance, high-frequency components designed for use in switching power supplies must be used for C1 and
C2 since large ripple currents flow in these capacitors. Note that if a ceramic capacitor, tantalum capacitor, or other
capacitor with an extremely low equivalent series resistance (ESR) is used for C2, abnormal oscillations may occur in
the output waveform. Do not use such a capacitor for C2.
The following equation gives the stability condition for the C2 capacitor and ESR values.
2
×
π
×
1
C2
×
ESR
≤
20kHz···················
Equation
5
• Repetitive peak reverse voltage
The AC ripple currents flowing in the input capacitor will be larger currents than those flowing in the output
capacitors.
The RMS current is given by the following equation. Note that capacitors must only be used with currents that are
within their current ratings.
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IC1=
VOUT
VOUT
VIN IOUT 2 1- VIN
+
1
12
×
∆IR2
[Arms]
• Output capacitor RMS current
Since the ripple current, an AC current, flowing in the output capacitors has a sawtooth waveform, the RMS value is
given by the following equation. Select output capacitors whose allowable ripple current rating is not exceeded by
this value.
IC2
=
1
2√3
×
VOUT (VIN - VOUT)
L × fsw × VIN
[Arms]
fsw = Switching frequency ··················· 300kHz
Resistors R1 and R2
• The resistors R1 and R2 set the output voltage. The error in the VOS pin voltage increases as the values used for these
resistors increase. Note also that the output voltage may rise due to leakage current in the switching transistors during
light load operation. For these reasons, R1 and R2 should be selected so that the current flowing in them is on the
order of 500µA.
R1=
1.23V
500µA
≈
2.4kΩ
We recommend values in the range 2.0 to 2.4kΩ
R2=
VOUT
1.23V
-1
× R1
The following equation gives the output voltage set by R1 and R2.
VO=
R2
1+ R1
× 1.23V (typ)
No.A0588-5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LA5735M.PDF ] | |
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