lm5006mmx National Semiconductor Corporation, lm5006mmx Datasheet

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lm5006mmx

Manufacturer Part Number
lm5006mmx
Description
80v, 600 Ma Constant On-time Buck Switching Regulator
Manufacturer
National Semiconductor Corporation
Datasheet
© 2011 National Semiconductor Corporation
80V, 600 mA Constant On-Time Buck Switching Regulator
General Description
The LM5006 Step Down Switching Regulator features all of
the functions needed to implement a low cost, efficient Buck
bias regulator. This high voltage regulator contains an 80V N-
Channel MOSFET Switch and a startup regulator. The device
is easy to implement and is provided in an MSOP-10 package.
The regulator’s control scheme uses an on-time inversely
proportional to V
quency remaining relatively constant with line and load vari-
ations. The control scheme requires no loop compensation,
resulting in fast transient response. An intelligent current limit
is implemented with a forced off-time which is inversely pro-
portional to V
while providing minimum foldback. Other features include:
Thermal Shutdown, VCC Under Voltage Lock-out, Max Duty
Cycle Limiter, a Pre-charge Switch, a programmable Under
Voltage Detector with a status flag output, and a gate driver
output for a synchronous rectifier.
Typical Application, Basic Step-Down Regulator
OUT
IN
. This scheme ensures short circuit control
. This feature results in the operating fre-
301131
LM5006
Features
Typical Applications
Package
Operating input voltage range: 6V to 75V
Integrated 80V, N-Channel Buck Switch
Internal start-up regulator
No Loop compensation required
Ultra-Fast Transient Response
Operating frequency remains constant with line and load
variations
Adjustable output voltage from 2.5V
Precision internal reference, ±2.5%
Intelligent current limit reduces foldback
Programmable Input UV detector with status flag output
Gate output driver for synchronous rectifier
Pre-charge switch enables bootstrap gate drive with no
load
Thermal shutdown
Non-Isolated Telecommunication Buck Regulator
Secondary High Voltage Post Regulator
+42V Automotive Systems
MSOP - 10
February 25, 2011
www.national.com
30113101

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lm5006mmx Summary of contents

Page 1

... Thermal Shutdown, VCC Under Voltage Lock-out, Max Duty Cycle Limiter, a Pre-charge Switch, a programmable Under Voltage Detector with a status flag output, and a gate driver output for a synchronous rectifier. Typical Application, Basic Step-Down Regulator © 2011 National Semiconductor Corporation LM5006 Features ■ Operating input voltage range 75V ■ ...

Page 2

... Connection Diagram Ordering Information Order Number LM5006MM LM5006MMX Pin Descriptions Pin Name Description 1 SW Switching Node 2 BST Boost Pin 3 LG Low side gate driver output for synchronous rectifier MOSFET 4 RTN Ground pin 5 UV Input pin for the under voltage indicator 6 UVO ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN RTN BST to RTN SW to RTN (Steady State) BST to VCC BST to SW VCC, ...

Page 4

... For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: For detailed information on soldering plastic MSOP packages, refer to the Packaging Data Book available from National Semiconductor Corporation. Note 3: All limits are guaranteed. All electrical characteristics having room temperature limits are tested during production with T limits are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control ...

Page 5

Typical Performance Characteristics Efficiency at 300 kHz, 10V V vs vs. Externally Applied V CC Efficiency Comparison at 200 kHz 30113124 30113125 On-Time vs 30113126 5 30113105 V vs 30113107 and ...

Page 6

Current Limit Off-Time vs. V Voltage at the R Shutdown Current into V www.national.com FB 30113138 Pin T 30113140 UVO Pin Low Voltage vs. Sink Current IN 30113142 6 Maximum Switching Frequency 30113139 Operating Current into V IN 30113141 30113143 ...

Page 7

LG vs. SW Deadtime 30113144 Gate Drive UVLO vs. Temperature 30113146 V Dropout vs. Temperature CC 30113159 V UVLO vs. Temperature CC V vs. Temperature CC V Output Impedance vs. Temperature CC 7 30113145 30113147 30113148 www.national.com ...

Page 8

V Current Limit vs. Temperature CC On-time vs. Temperature Current Limit Threshold vs. Temperature www.national.com Reference Voltage vs. Temperature 30113149 Minimum Off-time vs. Temperature 30113151 Current Limit Off-Time vs. Temperature 30113153 8 30113150 30113152 30113160 ...

Page 9

Operating Current vs. Temperature RT Pin Shutdown Threshold vs. Temperature UV Pin Threshold vs. Temperature Shutdown Current vs. Temperature 30113154 LG vs. SW Deadtime vs. Temperature 30113156 UV Hysteresis Current vs. Temperature 30113161 9 30113155 30113157 30113162 www.national.com ...

Page 10

Block Diagram Functional Description The LM5006 Step Down Switching Regulator features all the functions needed to implement a low cost, efficient, Buck bias power converter. This high voltage regulator contains N-Channel Buck Switch, is easy to implement ...

Page 11

The discontinuous operating frequency can be calculated as follows: where R = the load resistance L In continuous conduction mode, current flows continuously through the ...

Page 12

Regulation Comparator The feedback voltage compared to an internal 2.5V reference. In normal operation (the output voltage is regulat- ed), an on-time period is initiated when the voltage at FB falls below 2.5V. The buck switch stays ...

Page 13

FIGURE 3. Shutdown Implementation Current Limit The LM5006 contains an intelligent current limit OFF timer. If the current in the Buck switch reaches the current limit thresh- old, the present cycle is immediately terminated, and a non- resetable OFF timer ...

Page 14

Applications Information SELECTION OF EXTERNAL COMPONENTS A guide for determining the component values is illustrated with a design example. Refer to the Block Diagram. The fol- lowing steps will configure the LM5006 for: • Input voltage range (Vin): 15V to ...

Page 15

Where R is the device's on-resistance, and D is the on- DS(on) time duty cycle. C1: This capacitor’s purpose is to supply most of the switch current during the on-time, and limit the voltage ripple at Vin, on the assumption ...

Page 16

LOW OUTPUT RIPPLE CONFIGURATIONS For applications where low output ripple is required, the fol- lowing options can be used to reduce or nearly eliminate the ripple. a) Reduced ripple configuration: In across R to AC-couple the ripple at V FB2 ...

Page 17

FIGURE 7. Reduced Ripple Configuration b) Minimum ripple configuration: If the application requires a lower value of ripple (<10 mVp-p), the circuit of be used removed, and the resulting output ripple volt- age is determined by the inductor’s ...

Page 18

PC Board Layout The LM5006 regulation, over-voltage, and current limit com- parators are very fast, and respond to short duration noise pulses. Layout considerations are therefore critical for opti- mum performance. The layout must be as neat and compact as ...

Page 19

Physical Dimensions inches (millimeters) unless otherwise noted Mini SO Molded NS Package MUB10A 19 www.national.com ...

Page 20

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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