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LA5744MP 데이터시트 PDF




Sanyo Semicon Device에서 제조한 전자 부품 LA5744MP은 전자 산업 및 응용 분야에서
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부품번호 LA5744MP 기능
기능 Monolithic Linear IC Separately-Excited Step-Down Switching Regulator
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LA5744MP 데이터시트, 핀배열, 회로
Ordering number : ENA0587A
LA5744MP
Monolithic Linear IC
Separately-Excited Step-Down
Switching Regulator
(Variable Type)
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The LA5744MP is a separately-excited step-down switching regulator (variable type).
Functions
High efficiency.
Time-base generator (300kHz) incorporated.
Current limiter incorporated.
Thermal shutdown circuit incorporated.
Soft start circuit incorporated.
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Input voltage
Maximum output current
SW pin application reverse voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VIN
IO max
VSW
Pd max
Topr
Tstg
Conditions
Mounted on a circuit board.*
* Specified circuit board : 76.1×114.3×1.6mm3 : Copper foil ratio 60% FR4
Recommended Operating Conditions at Ta = 25°C
Parameter
Input voltage range
Symbol
VIN
Conditions
Ratings
30
3
-1
3.9
-30 to +125
-40 to +150
Ratings
4.5 to 28
Unit
V
A
V
W
°C
°C
Unit
V
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer's products or
equipment.
31407 MS PC / 11707 MS PC 20060929-S00007 No.A0587-1/5




LA5744MP pdf, 반도체, 판매, 대치품
LA5744MP
Protection Circuit Functional Descriptions
1. Overcurrent protection function
The overcurrent protection function detects, on a cycle-by-cycle basis, the output transistor current and turns off that
output transistor current if it exceeds 3.1A.
Limit current
Inductor current
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SWOUT voltage
2. Short circuit protection function
This IC prevents the current from increasing when the outputs are shorted by setting the switching frequency to 30kHz
if the VOS pin voltage falls below 0.8V.
Note 3 : If the soft start function is not used, the IC will start up with the overcurrent protection function operating. At this
time, the switching frequency will be cut in half. This means that the switching frequency will be 15kHz at
startup.
Note 4 : Since the switching frequency becomes 30kHz when the VOS pin voltage falls under 0.8V, the current capacity is
reduced. If a load is applied with the VOS pin voltage over 0.8V, the inductance value operates at 22µH. If a load
is to be applied when this voltage is under 0.8V, the inductance value must be increased.
Description of Functional Settings
1. Calculation equation to set the output voltage
This IC controls the switching output so that the VOS pin voltage becomes 1.23V (typ).
The equation to set the output voltage is as follows :
VO =
1+
R2
R1
× 1.23V(typ)
The VOS pin has the inrush current of 1µA (typ). Therefore, the error becomes larger when R1 and R2 resistance
values are large.
2. Startup Delay Function
The output voltage rises when the internal voltage reaches 0.4V (typical). Until that point, a capacitor is charged from
an internal 10µA (typical) constant-current supply. The startup delay time can be calculated as shown below
Example : Assume a 1µF capacitor is used.
Td
=
C
×
i
V
=
1µF × 0.4
10µA
= 40 ms
No.A0587-4/5

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관련 데이터시트

부품번호상세설명 및 기능제조사
LA5744MP

Monolithic Linear IC Separately-Excited Step-Down Switching Regulator

Sanyo Semicon Device
Sanyo Semicon Device

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