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LM5008 Scheda tecnica(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Il numero della parte LM5008
Spiegazioni elettronici  High Voltage (100V) Step Down Switching Regulator
Download  15 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5008 Scheda tecnica(HTML) 3 Page - National Semiconductor (TI)

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Pin Description
PIN
NAME
DESCRIPTION
APPLICATION INFORMATION
1
SW
Switching Node
Power switching node. Connect to the output
inductor, re-circulating diode, and bootstrap
capacitor.
2
BST
Boost Pin (Boot–strap capacitor input)
An external capacitor is required between the BST
and the SW pins. A 0.01µF ceramic capacitor is
recommended. An internal diode charges the
capacitor from V
CC.
3R
CL
Current Limit OFF time set pin
Toff = 10
-5 / (0.285 + (FB / 6.35 x 10−6 xR
CL))
A resistor between this pin and RTN sets the
off-time when current limit is detected. The off-time
is preset to 35µs if FB = 0V.
4
RTN
Ground pin
Ground for the entire circuit.
5
FB
Feedback input from Regulated Output
This pin is connected to the inverting input of the
internal regulation comparator. The regulation
threshold is 2.5V.
6R
ON/SD
On time set pin
Ton = 1.25 x 10
-10 R
ON /VIN
A resistor between this pin and V
IN sets the switch
on time as a function of V
IN. The minimum
recommended on time is 400ns at the maximum
input voltage. This pin can be used for remote
shutdown.
7V
CC
Output from the internal high voltage series pass
regulator. Regulated at 7.0V.
If an auxiliary voltage is available to raise the
voltage on this pin, above the regulation setpoint
(7V), the internal series pass regulator will
shutdown, reducing the IC power dissipation. Do not
exceed 14V. This voltage provides gate drive power
for the internal Buck switch. An internal diode is
provided between this pin and the BST pin. A local
0.1µF decoupling capacitor is recommended. Series
pass regulator is current limited to 10mA.
8V
IN
Input voltage
Recommended operating range: 9.5V to 95V.
www.national.com
3


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