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LM25007 Arkusz danych(PDF) 3 Page - Texas Instruments

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Numer części LM25007
Szczegółowy opis  LM25007 42V, 0.5A Step-Down Switching Regulator
Download  19 Pages
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

LM25007 Arkusz danych(HTML) 3 Page - Texas Instruments

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background image
FB
VIN
VCC
SW
RTN
ON TIMER
DRIVER
VIN
BST
LEVEL
SHIFT
SD/
RON
2.5V
THERMAL
SHUTDOWN
0.725A
BUCK
SWITCH
CURRENT
SENSE
COMPLETE
RCL
START
RCL
COMPLETE
START
Ron
100 PH
L1
C2
15 PF
R3
3.01k
R4
1k
R2
100k
RON
200k
C4
0.01 PF
C3
0.1 PF
12V -42V
10V
LM25007
UVLO
FB
R5
1
UVLO
REGULATION
COMPARATOR
OVER-VOLTAGE
COMPARATOR
2.875V
SD
SD
COMPLETE
START
MINIMUM OFF
TIMER
C1
1 PF
8
6
5
3
4
1
2
7
7V SERIES
REGULATOR
CURRENT LIMIT
OFF TIMER
SHUTDOWN
C5
0.1 PF,
100V
D1
Q
CLR
Q
SET
S
R
+
-
+
-
+
-
LM25007
www.ti.com
SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013
Pin Descriptions
Pin
Name
Description
Application Information
1
SW
Switching Node
Power switching node. Connect to the inductor, bootstrap capacitor, and free-wheeling
diode.
2
BST
Boost Boot–strap
An external capacitor is required between the BST and the SW pins. A 0.01µF ceramic
capacitor input
capacitor is recommended.
3
RCL
Current Limit OFF time
A resistor between this pin and RTN sets the off-time when current limit is detected.
programming pin
The off-time is preset to 17 µs if FB = 0V .
4
RTN
Circuit Ground
5
FB
Feedback Signal from
This pin is connected to the inverting input of the internal regulation comparator. The
Regulated Output
regulation threshold is 2.5V.
6
RON/SD
On-time set pin
A resistor between this pin and VIN sets the switch on-time as a function of Vin. The
minimum recommended on-time is 300ns at the maximum input voltage.
7
VCC
Output from the internal
If an auxiliary voltage is available to raise the voltage on this pin above the regulation
high voltage bias
setpoint (7V), the internal series pass regulator will shutdown, reducing the IC power
regulator.
dissipation. Do not exceed 14V. This output provides gate drive power for the internal
Buck switch. An internal diode is provided between this pin and the BST pin. A local
0.1uF decoupling capacitor is recommended.
8
VIN
Input supply voltage
Recommended operating range: 9V to 42V.
-
EP
Exposed pad, underside
Exposed metal pad on the WSON package underside. It is recommended to connect
of the WSON package
this pad to the PC board ground plane to aid in heat dissipation.
option
Typical Application Circuit and Block Diagram
Copyright © 2006–2013, Texas Instruments Incorporated
Submit Documentation Feedback
3
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