Monolithic Linear LA5779 Separately-excited Step-down S

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Monolithic Linear LA5779 Separately-excited Step-down S

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Ordering number ENA0476A
Monolithic Linear
LA5779
Separately-excited Step-down
Switching Regulator (Variable Type)
LA5779 Separately-excited step-down switching regulator (variable type).
Functions
High efficiency. external parts. Time-base generator (160kHz) incorporated. Current limiter incorporated. Thermal shutdown circuit incorporated. ON/OFF function.
Specifications
Absolute Maximum Ratings 25°C
Parameter Maximum Input voltage Maximum Output current application reverse voltage Allowable power dissipation Symbol max1 max2 Operating temperature Storage temperature Junction temperature Topr Tstg Infinitely large heat sink. Independent Conditions Ratings 1.75 +125 +150 Unit
Recommended Operating Conditions 25°C
Parameter Input voltage range Symbol Conditions Ratings Unit
SANYO Semiconductor Co.,Ltd. products described contained herein are, with regard "standard application", intended general electronics equipment (home appliances, equipment, communication device, office equipment, industrial equipment etc.). products mentioned herein shall intended "special application" (medical equipment whose purpose sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level reliability directly threaten human lives case failure malfunction product cause harm human bodies, shall they grant guarantee thereof. should intend products applications outside standard applications customer considering such and/or outside scope intended standard applications, please consult with prior intended use. there consultation inquiry before intended use, customer shall solely responsible use. Specifications SANYO Semiconductor Co.,Ltd. products described contained herein stipulate performance, characteristics, functions described products independent state, guarantees performance, characteristics, functions described products mounted customer' products equipment. verify symptoms states that cannot evaluated independent device, customer should always evaluate test devices mounted customer' products equipment.
62707 20070619-S00001 N1306 20060606-S00001 No.A0476-1/4
LA5779
Electrical Characteristics 25°C, 3.3V
Parameter Reference voltage Efficiency Switching frequency Switching frequency when short-circuit protection active Line regulation Load regulation Output voltage temperature coefficient Ripple attenuation factor Output leak current Current limiter operating voltage Operating current Standby current voltage range HIGH voltage range Thermal shutdown operating temperature Thermal shutdown Hysteresis width Design target value: measurement made. Designed target value. RREJ IOleak IVIN ISTBY VENAL VENAH Designed target value. 120Hz 15V, SWOUT -0.4V 15V, VOLINE VOLOAD VO/Ta 20V, 1.0A 15V, 1.5A Designed target value. ±0.5 mV/°C Symbol fshort Conditions 15V, 1.0A 15V, 1.0A, 15V, 1.0A 15V, 1.20 Ratings 1.23 1.26 Unit
Package Dimensions
unit (typ) 3079A
10.0
10.4max 10.0
Allowable pwer dissipation,
Infinitely large heat sink jc=5°C/W heat sink plate tightening torque 39N.cm With silicone grease applied.
15.0
(8.8)
17.8 21.3 23.0
1.75
heat sink
0.45
(1.6)
Ambient temperature,
PCA00833
SANYO TO-220-5H
Assignment
SWOUT
No.A0476-2/4
LA5779
Block Diagram
Reg.
SWOUT
Reset
Drive
Comp.
VREF
Amp.
Application Circuit Example
47µH
SWOUT
LA5779
470µF /50V 390µF
No.A0476-3/4
LA5779
Description Functional Settings
Calculation equation output voltage This controls switching output that voltage becomes 1.23V (typ). equation output voltage follows:
1.23V(typ)
inrush current (typ). Therefore, error becomes larger when resistance values large.
SANYO Semiconductor Co.,Ltd. assumes responsibility equipment failures that result from using products values that exceed, even momentarily, rated values (such maximum ratings, operating condition ranges, other parameters) listed products specifications SANYO Semiconductor Co.,Ltd. products described contained herein. SANYO Semiconductor Co.,Ltd. strives supply high-quality high-reliability products, however, semiconductor products fail malfunction with some probability. possible that these probabilistic failures malfunction could give rise accidents events that could endanger human lives, trouble that could give rise smoke fire, accidents that could cause damage other property. When designing equipment, adopt safety measures that these kinds accidents events cannot occur. Such measures include limited protective circuits error prevention circuits safe design, redundant design, structural design. event that SANYO Semiconductor Co.,Ltd. products described contained herein controlled under applicable local export control laws regulations, such products require export license from authorities concerned accordance with above law. part this publication reproduced transmitted form means, electronic mechanical, including photocopying recording, information storage retrieval system, otherwise, without prior written consent SANYO Semiconductor Co.,Ltd. information described contained herein subject change without notice product/technology improvement, etc. When designing equipment, refer "Delivery Specification" SANYO Semiconductor Co.,Ltd. product that intend use. Information (including circuit diagrams circuit parameters) herein example only; guaranteed volume production. Upon using technical information products described herein, neither warranty license shall granted with regard intellectual property rights other rights SANYO Semiconductor Co.,Ltd. third party. SANYO Semiconductor Co.,Ltd. shall liable claim suits with regard third party's intellctual property rights which resulted from technical information products mentioned above.
This catalog provides information June, 2007. Specifications information herein subject change without notice. No.A0476-4/4

Monolithic Linear LA5779 Separately-excited Step-down S

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