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PDF LA5677M Data sheet ( Hoja de datos )
| Número de pieza | LA5677M | |
| Descripción | Monolithic Linear IC | |
| Fabricantes | Sanyo Semicon Device | |
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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
kΩ
pF
kΩ
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
1 page  
LA5677M
Figure 1 Timer-Latch Short Circuit Protection Circuit
Figure 2 Timing Resistance/Oscillator Frequency Characteristics
4. Triangle Wave Oscillator Block
The triangle wave oscillator generates an essentially symmetric triangle wave using a timing capacitor and resistor
attached to the CT pin (pin 1) and the RT pin (pin 2), respectively. The voltage amplitude is between 1.4 and 2.0 V
with pin 2 stabilized at 1 V. The oscillator frequency is determined by the external capacitor and resistor.
5. Idle Period Adjustment Circuit Block
The idle period adjustment circuit consists of PWM comparators 1 and 2, each of which has one non-inverting and
two inverting inputs. The output pulse width (on time) is controlled according to the input voltage. Pins 6 and 11 are
dead time control pins, and are used to limit the maximum value of the pulse width. A pin voltage of 2.05 V
(Typical) or over results in the output being off for the whole period, and a pin voltage of 1.45 V (Typical) or lower
results in the output being on for the whole period.
No. 3660-5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LA5677M.PDF ] | |
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