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LA5751 데이터시트 PDF




Sanyo Semicon Device에서 제조한 전자 부품 LA5751은 전자 산업 및 응용 분야에서
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부품번호 LA5751 기능
기능 Monolithic Linear IC Separately-Excited Step-Down Switching Regulator
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LA5751 데이터시트, 핀배열, 회로
Ordering number : ENA0945
LA5751
Monolithic Linear IC
Separately-excited Step-down
Switching Regulator (3.3V)
www.DataSheetO4Uv.ceomrview
The LA5751 is a separately-excited step-down switching regulator (3.3V).
Features
High efficiency
Four external parts
Time-base generator (60kHz) incorporated
Current limiter incorporated
Thermal shutdown circuit incorporated
Soft start circuit incorporated
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Input voltage
Output current
SW pin application reverse voltage
Allowable power dissipation
Junction temperature
Operating temperature
Storage temperature
Symbol
VIN max
IO max
Vsw
Pd max1
Pd max2
Tj max
Topr
Tstg
Conditions
Infinite heat sink.
No heat sink.
Ratings
30
3
-1
7.5
1.75
150
-30 to +125
-40 to +150
Unit
V
A
V
W
W
°C
°C
°C
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.
91907 MS PC B8-8717 No.A0945-1/5




LA5751 pdf, 반도체, 판매, 대치품
LA5751
Description of Functional Settings
1.Start delay function
The SS pin has the internally-connected 22µA (typ) constant-current supply. When the voltage of SS pin exceeds the
threshold voltage, the regulator starts operation. As the threshold is 0.62V(typ), the start delay time can be calculated
as follows:
ex. For setting at 1µF
Td
=
C
×
i
V
=
1µ
× 0.62
22µ
=
28.2
msec
2.Soft start function
The internal PWM waveform has the voltage value as shown in the right.
If down-conversion from the voltage of VIN = 15V to 3.3V output to be made,
for example, the PWM-ON duty has the value as shown below.
www.DataSheet4U.com
PWMduty
=
VOUT +
VIN - Vsat
VF
+ VF
= 25%
(Note that calculation is made with Vsat = 1V and VF = 0.2V)
1.5V
0.62V
PWM wave
The output voltage of error amplifier, which is 3.3V, is the value with PWM = 25%, as calculated in the above
equation, so that this voltage is determined as follows:
Ver = (VPWM) × PWMduty + VPWML = 0.88V × 0.25 + 0.62V = 0.84V
(VPWM is the PWM amplitude value or 0.88V(typ) while VPWML is the lower limit voltage of PWM
waveform or 0.62V(typ))
SS pin and error amplifier output voltages are designed to prefer the lower voltages, so that VOUT will reach the
designed regulation voltage in timing when the SS pin voltage exceeds the error amplifier output. Therefore, the soft
strt time is calculated as follows:
Tss
=C
×
VPWM ×
i
PWMduty
=
C
×
0.88 × PWMduty
22µA
For the set conditions of C = 1µF and PWMduty = 25%:
Tss
=
1µ
×
0.88V ×
22µA
0.25
=
10msec
No.A0945-4/5

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