LM2575HVT-15 National Semiconductor, LM2575HVT-15 Datasheet - Page 21
![IC, STEP-DOWN REGULATOR, TO-220-5](/photos/18/98/189891/4243351_sml.jpg)
LM2575HVT-15
Manufacturer Part Number
LM2575HVT-15
Description
IC, STEP-DOWN REGULATOR, TO-220-5
Manufacturer
National Semiconductor
Datasheet
1.LM2575HVT-15.pdf
(28 pages)
Specifications of LM2575HVT-15
Primary Input Voltage
30V
No. Of Outputs
1
Output Voltage
15V
Output Current
1A
No. Of Pins
5
Operating Temperature Range
-40°C To +125°C
Supply Voltage Range
4V To 60V
Dc To Dc Converter Type
Inverting/Step Down
Number Of Outputs
1
Pin Count
5 +Tab
Input Voltage
60V
Switching Freq
58KHz
Efficiency
88%
Package Type
TO-220
Output Type
Fixed
Switching Regulator
Yes
Mounting
Through Hole
Input Voltage (min)
4V
Operating Temperature Classification
Automotive
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM2575HVT-15/NOPB
Manufacturer:
HAMAMAT
Quantity:
5 600
NEGATIVE BOOST REGULATOR
Another variation on the buck-boost topology is the negative
boost configuration. The circuit in Figure 11 accepts an input
voltage ranging from −5V to −12V and provides a regulated
−12V output. Input voltages greater than −12V will cause the
output to rise above −12V, but will not damage the regulator.
Because of the boosting function of this type of regulator, the
switch current is relatively high, especially at low input volt-
ages. Output load current limitations are a result of the max-
imum current rating of the switch. Also, boost regulators can
not provide current limiting load protection in the event of a
shorted load, so some other means (such as a fuse) may be
necessary.
Typical Load Current
200 mA for V
500 mA for V
Note: Pin numbers are for TO-220 package.
UNDERVOLTAGE LOCKOUT
In some applications it is desirable to keep the regulator off
until the input voltage reaches a certain threshold. An under-
voltage lockout circuit which accomplishes this task is shown
in Figure 12, while Figure 13 shows the same circuit applied
to a buck-boost configuration. These circuits keep the regu-
lator off until the input voltage reaches a predetermined level.
DELAYED STARTUP
The ON /OFF pin can be used to provide a delayed startup
feature as shown in Figure 14. With an input voltage of 20V
and for the part values shown, the circuit provides approxi-
mately 10 ms of delay time before the circuit begins switching.
Increasing the RC time constant can provide longer delay
times. But excessively large RC time constants can cause
problems with input voltages that are high in 60 Hz or 120 Hz
ripple, by coupling the ripple into the ON /OFF pin.
ADJUSTABLE OUTPUT, LOW-RIPPLE
POWER SUPPLY
A 1A power supply that features an adjustable output voltage
is shown in Figure 15. An additional L-C filter that reduces the
output ripple by a factor of 10 or more is included in this circuit.
IN
IN
= −5.2V
= −7V
FIGURE 11. Negative Boost
V
TH
V
Z1
+ 2V
BE
(Q1)
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Note: Complete circuit not shown.
Note: Pin numbers are for the TO-220 package.
Note: Complete circuit not shown (see Figure 10).
Note: Pin numbers are for the TO-220 package.
Note: Complete circuit not shown.
Note: Pin numbers are for the TO-220 package.
FIGURE 12. Undervoltage Lockout for Buck Circuit
FIGURE 13. Undervoltage Lockout
FIGURE 14. Delayed Startup
for Buck-Boost Circuit
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