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Ordering number : ENA0476A
Monolithic Linear IC
LA5779
Overview
Separately-excited Step-down
Switching Regulator (Variable Type)
The LA5779 is a Separately-excited step-down switching regulator (variable type).
Functions
* High efficiency. * Six external parts. * Time-base generator (160kHz) incorporated. * Current limiter incorporated. * Thermal shutdown circuit incorporated. * ON/OFF function.
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum Input voltage Maximum Output current SW pin application reverse voltage Allowable power dissipation Symbol VIN max IO max VSW Pd max1 Pd max2 Operating temperature Storage temperature Junction temperature Topr Tstg Tj max Infinitely large heat sink. Independent IC. Conditions Ratings 30 3 -1 7.5 1.75 -30 to +125 -40 to +150 150 Unit V A V W W C C C
Recommended Operating Conditions at Ta = 25C
Parameter Input voltage range Symbol VIN Conditions Ratings 4.5 to 28 Unit V
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.
62707 MS PC 20070619-S00001 / N1306 MS PC 20060606-S00001 No.A0476-1/4
LA5779
Electrical Characteristics at Ta = 25C, VO = 3.3V
Parameter Reference voltage Efficiency Switching frequency Switching frequency when short-circuit protection is active Line regulation Load regulation Output voltage temperature coefficient Ripple attenuation factor Output leak current Current limiter operating voltage Operating current Standby current ENA pin LOW voltage range ENA pin HIGH voltage range Thermal shutdown operating temperature Thermal shutdown Hysteresis width * Design target value: No measurement made. TSD Designed target value. * 15 C RREJ IOleak IS IVIN ISTBY VENAL VENAH TSD Designed target value. * 2.4 165 f = 100 to 120Hz VIN = 15V, SWOUT = -0.4V VIN = 15V VIN = 15V VIN = 15V, ENA = 5V 3.1 5.6 200 0.6 VIN 45 50 dB A A mA A V V C VOLINE VOLOAD VO/Ta VIN = 8 to 20V, IO = 1.0A VIN = 15V, IO = 0.5 to 1.5A Designed target value. * 40 10 0.5 100 30 mV mV mV/C Symbol VOS f fshort Conditions min VIN = 15V, IO = 1.0A VIN = 15V, IO = 1.0A, Set VO = 5V VIN = 15V, IO = 1.0A VIN = 15V, VOS = 0V 128 15 1.20 Ratings typ 1.23 84 160 30 192 45 max 1.26 V % kHz kHz Unit
Package Dimensions
unit : mm (typ) 3079A
10.0
Pd max -- Ta
3.6
2.7
10.4max 10.0
4.5 1.3
Allowable pwer dissipation, Pd max -- W
8.0 7.5
100x100x1.5mm3
Infinitely large heat sink jc=5C/W Al heat sink plate tightening torque 39N.cm With silicone grease applied.
15.0
6.0 5.6
50x50x1.5mm3
(8.8)
17.8 21.3 23.0
4.0 3.3 2.0 1.75
30x30x1.5mm3 No heat sink
0.9
2.7
1
5 0.8 0.45 4.5 8.4
(1.6)
1.7
0 --30
0
20
40
60
80
100
120
140
160
Ambient temperature, Ta -- C
PCA00833
SANYO : TO-220-5H
Pin Assignment
(1) VIN (2) SWOUT (3) GND (4) VOS (5) ENA
No.A0476-2/4
LA5779
Block Diagram
VIN 1 Reg. OCP
2 SWOUT
OSC
Reset
Drive
Comp.
THD 4 VOS VREF
Amp.
5 ENA
3 GND
Application Circuit Example
L1 47H
VIN
SWOUT
LA5779
C1 470F /50V D1 SBD C2 390F
VOS ENA GND
R2 R1
No.A0476-3/4
LA5779
Description of Functional Settings
Calculation equation to set the output voltage This IC controls the switching output so that the VOS pin voltage becomes 1.23V (typ). The equation to set the output voltage is as follows:
R2 VO = 1+ x 1.23V(typ) R1
The VOS pin has the inrush current of 1A (typ). Therefore, the error becomes larger when R1 and R2 resistance values are large.
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This catalog provides information as of June, 2007. Specifications and information herein are subject to change without notice. PS No.A0476-4/4

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