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Ordering number : ENA0719
Monolithic Linear IC
LA5772
Overview
Separately-excited Step-down
Switching Regulator (5V)
The LA5771 is a separately-excited step-down switching regulator (5V).
Features
* High efficiency * Four external parts * Time-base generator (160kHz) incorporated * Current limiter incorporated * Thermal shutdown circuit incorporated * Soft start circuit incorporated
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Input voltage Output current SW pin application reverse voltage Allowable power dissipation Symbol VIN max IO max Vsw Pd max1 Pd max2 Operating temperature Storage temperature Topr Tstg No heat sink Infinite heat sink Conditions Ratings 34 3 -1 1.75 7.5 -30 to +125 -40 to +150 Unit V A V W W C C
Recommended Operating Conditions at Ta = 25C
Parameter Input voltage range VIN Symbol Conditions Ratings 7 to 32 Unit V
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30707 20070214-S00007 No.A0719-1/5
LA5772
Electrical Characteristics at Ta = 25C
Parameter Output voltage Efficiency Switching frequency Line regulation Load regulation Output voltage temperature coefficient Ripple attenuation factor Current limiter operating voltage Thermal shutdown operating temperature Thermal shutdown hysteresis width VO f VOLINE VOLOAD VO/Ta RREJ IS TSD TSD F=100 to 120Hz VIN=15V Designed target value* Designed target value* 3.1 165 15 Symbol Conditions min VIN=15V, IO=1.0A VIN=15V, IO=1.0A VIN=15V, IO=1.0A VIN=8 to 20V, IO=1.0A VIN=15V, IO=0.5 to 1.5A 120 4.80 Ratings typ 5.00 84 160 40 10 0.5 45 200 100 30 max 5.20 V % kHz mV mV mV/C dB A C C Unit
* Designed target value: No measurement made.
Package Dimensions
unit : mm (typ) 3079C
10.0
Pd max -- Ta
3.6
2.7
10.4max 10.0
4.5 1.3
Allowable power dissipation, Pd max -- W
8.0 7.5
100x100x1.5mm3
Infinite heat sink jc=5C
15.0
6.0 5.6
50x50x1.5mm3 Al heat sink mounting torque 39Ncm silicone grease applied
40 60 80 100 120 140 160 MSG07021
(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 -20
0
20
Ambient temperature, Ta -- C
SANYO : 220-5H
Pin Assignment
(1)VIN (2)SWOUT (3)GND (4)VOS (5)SS
No.A0719-2/5
LA5772
Block Diagram
VIN 1
2 SWOUT
Reg.
OCP
OSC
Reset Drive
Comp. TSD 4 VOS
Amp.
VREF
5 SS
3 GND
Application Circuit Example
L1 68H
VIN
SWOUT
LA5772
C1 220F /35V D1 SBD C2 1000F /6.3V R2 R1
VOS SS
C3 1F /50V
GND
Notes: C3 is for the soft start function. Delete C3 and keep the SS pin open when the soft function is not necessary.
No.A0719-3/5
LA5772
Description of Functional Settings
1.Start delay function The SS pin has the internally-connected 22A (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 1F
Td = C x V 1 x 0.62 = = 28.2 msec 22 i
1.5V
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 is to be made, for example, the PWM-ON duty has the value as shown below.
PWMduty = VOUT +VF = 27% VIN - Vsat + VF
0.62V PWM wave
(Note that calculation is made with Vsat=1V and VF=0.2V) 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) x PWMduty + VPWML = 0.88V x 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 x VPWM x PWMduty C x 0.88 x PWMduty = 22A i 1 x 0.88V x 0.27 = 10.8msec 22A
For the set conditions of C=1F and PWMduty=27%:
Tss =
No.A0719-4/5
LA5772
Timing Chart
VIN
SWOUT
VOUT
Td
Tss
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This catalog provides information as of March, 2007. Specifications and information herein are subject to change without notice. PS No.A0719-5/5

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