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LA5677M 데이터시트 PDF




Sanyo Semicon Device에서 제조한 전자 부품 LA5677M은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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기능 Monolithic Linear IC
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LA5677M 데이터시트, 핀배열, 회로
Ordering number : EN3660B
Monolithic Linear IC
LA5677M
Dual Switching Regulator Control IC
Overview
The LA5677M supports single-input control of the outputs
of two converters of arbitrary types, including step up, step
down and inverting. Since the LA5677M supports low
voltage (3.6 to 18 V) and high frequency (1 to 500 kHz)
operation, it is ideal for use in power supplies in battery
powered portable equipment.
Package Dimensions
unit: mm
3035A-MFP16
[LA5677M]
Features
• Operates at low voltages (3.6 to 18 V)
• Can be used with high frequency oscillators (1 to
500 kHz)
• Built-in low input malfunction prevention circuit
• Built-in timer-latch short circuit protection circuit
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Error amplifier input voltage
Collector output voltage
Collector output current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
VI
VO
IO
Pd max
Topr
Tstg
Operating Conditions at Ta = 25°C
Conditions
Parameter
Recommended supply voltage
Error amplifier input voltage
Collector output voltage
Collector output current
Feedback pin current
Feedback resistance
Timing capacitance
Timing resistance
Oscillator frequency
Symbol
VCC
VI
VO
IO
IFT
RNF
CT
RT
fOSC
Conditions
min
3.6
1.05
–0.3
100
150
5.1
1
SANYO: MFP16
Ratings
20
20
20
21
330
–20 to +85
–40 to +125
Unit
V
V
V
mA
mW
°C
°C
Ratings
typ
max
18
1.45
+18
20
45
15000
100
500
Unit
V
V
V
mA
µA
k
pF
k
kHz
Any and all SANYO 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 representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO 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 products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
O3098HA (OT)/92793TS A8-8023 No. 3660-1/7




LA5677M pdf, 반도체, 판매, 대치품
Equivalent Circuit Block Diagram
LA5677M
Operation Overview
1. Reference Voltage Block
The reference voltage block uses a 2.5 V reference voltage. This voltage is made available to external circuits from
pin 16, and at the same time is used as the reference power supply by internal circuits.
2. Low Input Malfunction Prevention Circuit Block
The low input malfunction prevention circuit prevents incorrect operation when the power supply is brought up or
during brief voltage drops. After power is applied and the reference voltage reaches Vbe, the output transistors are
held off until the power supply voltage becomes 2.72 V (typical). The dead time control pin voltage is held at the
high level (Vref) and the short circuit protection pin is held low (the initial state). Since this circuit has a hysteresis of
120 mV (typical) chattering due to power supply ripple can be prevented to a certain extent.
3. Timer-Latch Short Circuit Protection Circuit
During output overload, the timer-latch short circuit protection circuit’s short circuit protection comparator turns off
Q86 when the error amplifier inputs a low level signal (a voltage less than Vref/2) to one or both of the short circuit
protection comparator’s two non-inverting inputs. At this time the pin 15 voltage increases from about 0.75 V (steady
state) towards Vref as the external capacitor is charged from Vref through resistor R41 (80 k). When the capacitor is
charged to about 1.2 V, the protection latch is set, the output transistors are turned off, and the idle time becomes 100%.
This also turns on Q97 which resets the protection enable state. The latch circuit reset voltage is under 1.9 V (typical).
VPE1 = Vref {1 – exp (–t1/R41•CPT)}
VPE2 = Vref {1 – exp (–t2/R41•CPT)}
0.75 = 2.5 {1 – exp (–t1/80 k•CPT)}
1.20 = 2.5 {1 – exp (–t2/80 k•CPT)}
t1 = 28.56 k•CPT
t2 = 52.31 k•CPT
tPT = t2 – t1 = 23.75 k•CPT
CPT = 42.1 × tPT [µF]
No. 3660-4/7

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LA5677M 전자부품, 판매, 대치품
LA5677M
Specifications of any and all SANYO 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.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or 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 products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining 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 permission of SANYO Electric 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 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. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.
This catalog provides information as of December, 1998. Specifications and information herein are
subject to change without notice.
PS No. 3660-7/7

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LA5677M

Monolithic Linear IC

Sanyo Semicon Device
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