LA5752.pdf 데이터시트 (총 5 페이지) - 파일 다운로드 LA5752 데이타시트 다운로드

No Preview Available !

Ordering number : ENA0947
LA5752
Monolithic Linear IC
Separately-excited Step-down
Switching Regulator (5V)
www.DataSheetO4Uv.ceomrview
The LA5752 is a separately-excited step-down switching regulator (5V).
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 B8-8719 No.A0947-1/5

No Preview Available !

LA5752
Recommended Operating Conditions at Ta = 25°C
Parameter
Input voltage range
Operating junction temperature range
Symbol
VIN
Tj op
Conditions
Ratings
7 to 28
-30 to +150
Unit
V
°C
Electrical Characteristics at Ta = 25°C
Parameter
Symbol
Output voltage
Efficiency
VO
η
Switching frequency
f
Line regulation
www.DataSheet4ULo.acdomregulation
VOLINE
VOLOAD
Output voltage temperature coefficient
VO/Ta
Ripple attenuation factor
RREJ
Current limiter operating voltage
IS
Thermal shutdown operating temperature TSD
Thermal shutdown hysteresis width
TSD
* Designed target value: No measurement made.
Package Dimensions
unit : mm (typ)
3079C
10.4max
10.0
3.6
4.5
1.3
0.9 2.7
1
(1.6)
5
0.8
1.7
0.45
4.5
8.4
Conditions
VIN = 20V, IO = 1.0A
VIN = 20V, IO = 1.0A
VIN = 20V, IO = 1.0A
VIN=8 to 20V, IO=1.0A
VIN = 20V, IO = 0.5 to 1.5A
f = 100 to 120Hz
VIN = 15V
Designed target value*
Designed target value*
min
4.80
48
3.1
Ratings
typ
5.00
84
60
40
10
±0.5
45
165
15
max
5.20
72
100
30
Unit
V
%
kHz
mV
mV
mV/°C
dB
A
°C
°C
Pd max -- Ta
10.0
8.0 100×100×1.5mm3
7.5
Infinite heat sink θjc=5°C
6.0 50×50×1.5mm3
5.6
4.0 30×30×1.5mm3
3.3
2.0 No heat sink
1.75
Al heat
sink
mounting
torque
39Ncm
silicone
grease
applied
0
-30 -20
0 20 40 60 80 100 120 140 160
Ambient temperature, Ta -- °C MSG07021
SANYO : 220-5H
Pin Assignment
(1)VIN (2)SWOUT (3)GND (4)VOS (5)SS
No.A0947-2/5

No Preview Available !

Block Diagram
LA5752
VIN 1
www.DataSheet4U.com
Reg.
OCP
OSC
Reset
Comp.
Amp.
VREF
Drive
TSD
2 SWOUT
4 VOS
5 SS
3 GND
Application Circuit Example
VIN
SWOUT
L1
150µH
C1
1000µF
LA5752
SS GND
C3
1µF
VOS
D1
SBD
C2
1000µF
Notes: C3 is for the soft start function. Delete C3 and keep the SS pin open when the soft function is not necessary.
No.A0947-3/5

No Preview Available !

LA5752
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 = 20V to 5V 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
= 27%
(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 5V, is the value with PWM = 27%, as calculated in the above equation,
so that this voltage is determined as follows:
Ver = (VPWM) × PWMduty + VPWML = 0.88V × 0.27 + 0.62V = 0.86V
(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 = 27%:
Tss
=
1µ
×
0.88V ×
22µA
0.27
=
10.8msec
No.A0947-4/5

No Preview Available !

Timing Chart
VIN
SWOUT
VOUT
www.DataSheet4U.com
Td
LA5752
Tss
SANYO Semiconductor Co.,Ltd. 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 Co.,Ltd.
products described or contained herein.
SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all
semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or
malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise
to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt
safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not
limited to protective circuits and error prevention circuits for safe design, redundant design, and structural
design.
In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are
controlled under any of applicable local export control laws and regulations, such products may require the
export license from the authorities concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise,
without the prior written consent of SANYO Semiconductor Co.,Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the
SANYO Semiconductor Co.,Ltd. product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed
for volume production.
Upon using the technical information or products described herein, neither warranty nor license shall be granted
with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third
party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's
intellctual property rights which has resulted from the use of the technical information and products mentioned
above.
This catalog provides information as of September, 2007. Specifications and information herein are subject
to change without notice.
PS No.A0947-5/5