LM5041AMTC National Semiconductor, LM5041AMTC Datasheet

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LM5041AMTC

Manufacturer Part Number
LM5041AMTC
Description
IC, PWM, CASCADED, POWERWISE
Manufacturer
National Semiconductor
Datasheet

Specifications of LM5041AMTC

Input Voltage
48V
Output Voltage
5V
Output Current
100mA
Frequency
600kHz
Supply Voltage Range
15V To 90V
Digital Ic Case Style
TSSOP
No. Of Pins
16
Operating Temperature Range
-40°C To +125°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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© 2005 National Semiconductor Corporation
LM5041A
Cascaded PWM Controller
General Description
The LM5041A PWM controller contains all of the features
necessary to implement either current-fed or voltage-fed
push-pull or bridge power converters. These “Cascaded”
topologies are well suited for multiple output and higher
power applications. The LM5041A’s four control outputs in-
clude: the buck stage controls (HD and LD) and the push-
pull control outputs (PUSH and PULL). Push-pull outputs are
driven at 50% nominal duty cycle at one half of the switching
frequency of the buck stage and can be configured for either
a guaranteed overlap time (for current-fed applications) or a
guaranteed both-off time (for voltage-fed applications).
Push-pull stage MOSFETs can be driven directly from the
internal gate drivers while the buck stage requires an exter-
nal driver such as the LM5102. The LM5041A includes a
high-voltage start-up regulator that operates over a wide
input range of 15V to 100V. The PWM controller is designed
for high-speed capability including an oscillator frequency
range up to 1 MHz and total propagation delays of less than
100ns. Additional features include: line Under-Voltage Lock-
out (UVLO), soft-start, an error amplifier, precision voltage
reference, and thermal shutdown.
The two differences between the LM5041 and the LM5041A
are: No second level current limit in the ’A’ version No
softstart (SS) shutdown comparator in the ’A’ version .
Typical Application Circuit
Simplified Cascaded Push-Pull Power Converter
DS201378
Features
n Internal Start-up Bias Regulator
n Programmable Line Under-Voltage Lockout (UVLO) with
n Current Mode Control
n Internal Error Amplifier with Reference
n Cycle-by-cycle Over-Current Protection
n Leading Edge Blanking
n Programmable Push-Pull Overlap or Dead Time
n Internal 1.5A Push-Pull Gate Drivers
n Programmable Soft-start
n Programmable Oscillator with Sync Capability
n Precision Reference
n Thermal Shutdown
Applications
n Telecommunication Power Converters
n Industrial Power Converters
n Multi-Output Power Converters
n +42V Automotive Systems
Packages
n TSSOP-16
n LLP-16 (5x5 mm) Thermally Enhanced
Adjustable Hysteresis
20137801
www.national.com
May 2005

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LM5041AMTC Summary of contents

Page 1

... No second level current limit in the ’A’ version No softstart (SS) shutdown comparator in the ’A’ version . Typical Application Circuit Simplified Cascaded Push-Pull Power Converter © 2005 National Semiconductor Corporation Features n Internal Start-up Bias Regulator n Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis ...

Page 2

... Connection Diagram Ordering Information Order Number Package Type LM5041AMTC TSSOP-16 LM5041AMTCX TSSOP-16 LM5041ASD LLP-16 LM5041ASDX LLP-16 Pin Description PIN NAME 1 V Source Input Voltage Feedback Signal 3 COMP Output of the Internal Error Amplifier 4 REF Precision 5 volt reference output 5 HD Main Buck PWM control output ...

Page 3

... Hysteresis is set by a switched internal current source (20µA). The exposed die attach pad on the LLP package should be connected to a PCB thermal pad at ground potential. For additional information on using National Semiconductor’s No Pull Back LLP package, please refer to LLP Application Note AN-1187. 3 APPLICATION INFORMATION ...

Page 4

Block Diagram www.national.com Simplified Block Diagram 4 20137803 ...

Page 5

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications GND 100V GND 16V CC All Other Inputs to GND -0 Junction Temperature 150˚C Storage Temperature -65˚C to +150˚C Range Electrical Characteristics Specifications with standard typeface are for T Temperature range ...

Page 6

Electrical Characteristics Specifications with standard typeface are for T Temperature range 48V Symbol Parameter Soft-Start Soft-start Current Source Soft-start to COMP Offset Oscillator Frequency1 (RT = 26.7KΩ) Frequency2 (RT = 7.87KΩ) Sync threshold PWM Comparator ...

Page 7

... Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: For detailed information on soldering plastic TSSOP and LLP packages, refer to the Packaging Data Book available from National Semiconductor Corporation. ...

Page 8

Typical Performance Characteristics V and Pin Current vs Temp Overlap Time vs R www.national.com IN 20137808 20137815 SET 20137811 20137809 Frequency vs RT 20137810 Dead Time vs R ...

Page 9

Typical Performance Characteristics Overlap Time vs Temp Error Amplifier Gain Phase (Continued) Dead Time vs Temp 20137813 20137816 9 20137814 www.national.com ...

Page 10

Detailed Operating Description The LM5041A PWM controller contains all of the features necessary to implement either current-fed or voltage-fed push-pull or bridge power converters. These “Cascaded” topologies are well suited for multiple output and higher power applications. The LM5041A’s four ...

Page 11

Push-Pull Outputs (Continued) PWM Comparator The PWM comparator compares the slope compensated current ramp signal to the loop error voltage from the internal error amplifier (COMP pin). This comparator is optimized for speed in order to achieve minimum controllable duty ...

Page 12

Slope Compensation The PWM comparator compares the current sense signal to the voltage at the COMP pin. The output stage of the internal error amplifier generally drives the COMP pin. At duty cycles greater than 50 percent, current mode control ...

Page 13

Typical Application FIGURE 1. Simplified Cascaded Half-Bridge 13 20137806 www.national.com ...

Page 14

www.national.com 14 ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted Molded TSSOP-16 NS Package Number MTC16 16-Lead LLP Surface Mount Package NS Package Number SDA16A 15 www.national.com ...

Page 16

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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