LM5007MM/NOPB National Semiconductor, LM5007MM/NOPB Datasheet - Page 7
LM5007MM/NOPB
Manufacturer Part Number
LM5007MM/NOPB
Description
IC BUCK ADJ .5A 8MSOP
Manufacturer
National Semiconductor
Type
Step-Down (Buck)r
Datasheet
1.LM5007SDNOPB.pdf
(12 pages)
Specifications of LM5007MM/NOPB
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
2.5 ~ 73 V
Current - Output
500mA
Frequency - Switching
800kHz
Voltage - Input
9 ~ 75 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
For Use With
LM5007EVAL - EVALUATION BOARD FOR LM5007
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Other names
LM5007MM
LM5007MMTR
LM5007MMTR
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Over-Voltage Comparator
The over-voltage comparator is provided to protect the output
from overvoltage conditions due to sudden input line voltage
changes or output loading changes. The over-voltage com-
parator monitors the FB pin versus an internal 2.875V refer-
ence (OV_REF). If the voltage at FB rises above OV_REF the
comparator immediately terminates the buck switch on time
pulse.
FIGURE 1. Low Ripple Output Configuration
FIGURE 2. Self Biased Configuration
7
ON Time generator and Shutdown
The on time of the LM5007 is set inversely proportional to the
input voltage by an external resistor connected between Ron
and Vin. The Ron terminal is a low impedance input biased at
approximately 1.5V. Thus the current through the resistor and
into the Ron terminal is approximately proportional to Vin and
used internally to control the on timer. This scheme of input
voltage feed-forward hysteretic operation achieves nearly
constant operational frequency over varying line and load
conditions. The on time equation for the LM5007 is :
20078306
20078305
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