LM5033
100V Push-Pull Voltage Mode PWM Controller
General Description
The LM5033High Voltage PWM controller contains all the features needed to implement Push-Pull,Half-Bridge,and Full-Bridge topologies.Applications include closed loop volt-age mode converters with a highly regulated output voltage,or an open loop "DC transformer"such as an Intermediate Bus Converter (IBC)with an efficiency >95%.The small 10pin LLP-10package with exposed pad provides for efficient thermal management.Two alternating gate driver outputs with a guaranteed deadtime are provided.The LM5033in-cludes a start-up regulator that operates over a wide input range of 15V to 100V.Additional features include:precision voltage reference output,current limit detection,remote shutdown,softstart,sync capability and thermal shutdown.This high speed IC has total propagation delays less than 100ns and a 1MHz capable oscillator.
Features
n Internal high voltage (100V)start-up regulator n Single resistor oscillator setting n Synchronizable
n Precision reference output n Adjustable soft-start n Over-current protection
n Direct optocoupler interface n 1.5A peak gate drivers n
Thermal Shutdown
Applications
n Intermediate DC/DC Bus Converter n Telecommunication Power Converters n Industrial Power Converters n
+42V Automotive Systems
Package
n LLP-10
Connection Diagram
20035401
10-Lead Plastic,Dual,LLP
Ordering Information
Order Number Package Type NSC Package Drawing Supplied As
LM5033SD LLP-10(4x 4mm)SDC10A 1000Units on Tape and Reel LM5033SDX
LLP-10(4x 4mm)
SDC10A
4500Units on Tape and Reel
April 2004
LM5033100V Push-Pull Voltage Mode PWM Controller
©2004National Semiconductor Corporation DS200354www.national
Pin Description
PIN NAME DESCRIPTION
APPLICATION INFORMATION
1Vin Input Voltage
Input to the start-up regulator.Input range is 15V to 90V,with transient capability to 100V .
2REF 2.5V precision reference output Sink only,requires an external pull-up resistor.This can be used as a reference for external circuitry.3
COMP
PWM Input
Feedback to the PWM comparator’s inverting input,through a 3:1divider.The output duty cycle increases as this pin’s voltage increases.Internally there is a 5k Ωpullup to +5.2V.
4VCC
9.6V output from the internal high voltage series pass regulator
An external voltage (10V -15V)can be applied to this pin to shutdown the internal regulator,thereby re
ducing internal dissipation.An internal diode connects Vcc to Vin.
5OUT1Gate Driver Output #1Alternating output gate driver,which can source and sink 1.5A.
6OUT2Gate Driver Output #2
Alternating output gate driver,which can source and sink 1.5A.
7
GND
Ground pin for all internal circuitry
Connections to external ground must be done with care for optimum performance.See the Functional Description and Applications Section for more information.
8CS Current sense input
Current sense input for the current limit detection.If CS exceeds 0.5V the outputs are disabled and the softstart pin is discharged to ground.
9
R T /SYNC
Oscillator timing resistor pin and synchronization input An external resistor to ground sets the oscillator frequency.This pin will also accept ac-coupled synchronization pulses from an external source.10SS
Softstart pin
An internal 10µA current source and an external capacitor set the soft-start timing.This pin can be externally pulled to below 0.5V to disable the output drivers.
L M 5033
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LM5033 Block Diagram
Functional Block Diagram Array
20035402
FIGURE1.
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and specifications.V IN to GND -0.3V to 100V V CC to GND -0.3V to 16V Rt/Sync to GND -0.3V to 5.5V Pins 3,8,10to GND -0.3V to 7.0V
ESD Rating (Note 3)
Human Body Model 2kV
Storage Temperature Range -65˚C to 150˚C Junction Temperature 150˚C
Power Dissipation (Note 2)
Internally Limited
Operating Ratings (Note 1)
V IN Voltage (Pin1)
15to 90V Operating Junction Temperature
-40˚C to 125˚C
Electrical Characteristics
Specifications with standard typeface are for T J =25˚C,and those with boldface type apply over full Operating Junction Temperature range .V IN =48V,V CC =10V applied externally,R T =26.7k Ω,unless otherwise stated.See (Note 4)and (Note 5).Symbol Parameter Conditions
Min Typ Max Units V CC Startup Regulator (Pins 1,4)
V CC Reg V CC Voltage Pin 4open
9.29.610.0
V Icc-out
V CC Current Limit
Out1,Out2disabled.Ext.supply to Vcc disconnected.20
34
mA
Iin
Startup Regulator Current into V IN
Normal Operation V IN =90V
150500µA Ext.V CC Supply Disconnected and
Output Load =1800pF 7
mA
SS Pin =0V
3mA UVT
V CC Undervoltage Threshold (increasing V CC )
VccReg -300mV VccReg -100
mV
V
UVT Hysteresis (decreasing V CC )
2.3 2.8
3.3Icc-in
Supply Current from external source to V CC
SS Pin =0V
23
mA
SS Pin =open and Output Load =1800pF 7
2.5V Reference (Pin 2)Vref
Output voltage Pin 2sink current =5mA
2.44 2.50 2.56
V Current sink capability
5.013
mA
Current Sense (Pin 8)CS
Threshold voltage 0.45
0.500.55
V CS delay to output
Pin 8taken from zero to 0.6V.Time for Out1or Out2to fall to 90%of Vcc.CLoad =0@Out1,Out230
ns
Current sink capability (clocked)
Pin 8≤0.3V
36mA
Softstart (Pin 10)
Softstart current source
71013µA Softstart to Comp offset
0.25
0.500.75
V Open Circuit Voltage
5.0
V
L M 5033
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Electrical Characteristics(Continued)
Specifications with standard typeface are for T J=25˚C,and those with boldface type apply over full Operating Junction Temperature range.V IN=48V,V CC=10V applied externally,R T=26.7kΩ,unless otherwise stated.See(Note4)and(Note 5).
Symbol Parameter Conditions Min Typ Max Units Oscillator(Pin9)
Fs1Internal frequency Rt=26.7kΩ175200225kHz Fs2Internal frequency Rt=8.2kΩ600kHz Vsync Syn
c threshold 3.2 3.8V R t/Sync DC voltage 2.0V PWM Comparator Input(Pin3)
t PWM Gain from pin3to
PWM comparator
0.34V/V
Maximum duty cycle at Out1,Out2See PWM Comparator
text
100x
(0.5T S-T D)/T S
%
Minimum duty cycle at
Out1,Out2
Pin3=0V.0% Open Circuit Voltage 4.2 5.2 6.2V
Short circuit current Pin3=0V0.6 1.1 1.5mA
Output Drivers(Pin5,6)
Deadtime(T D)CLoad=0@OUT1,
OUT2.Time measured
from10%of falling
output to10%of rising
output.
85135185ns
Rise Time C Load=1nF16ns
Fall Time C Load=1nF16ns
Output High Voltage Iout=50mA(source)Vcc-0.75Vcc-0.25V
Output Low Voltage Iout=100mA(sink)0.250.75V
Max.source current 1.5A
Max.sink current 1.5A
Thermal Shutdown
T SD Shutdown temperature165˚C Shutdown temperature
hysteresis
15˚C
Thermal Resistance
θJA Junction to Ambient SDC10A Package38˚C/W
Note1: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.
wwwdjNote2:The maximum allowable power dissipation is a function of the maximum allowed junction temperature(T J(max)),the ambient temperature(T A),and the
junction-to-ambient thermal resistance(θJA).The maximum allowable power dissipation can be calculated from PD=(T J(max)-T A)/θJA.Excessive power dissipation
will cause the thermal shutdown to activate.
Note3:The human body model is a100pF capacitor discharged through a1.5kΩresistor into each pin.
Note4:Min and Max limits are100%production tested at25˚C.Limits over the operating temperature range are guaranteed through correlation using Statistical
Quality Control(SQC)methods.Limits are used to calculate National’s Average Outgoing Quality Level(AOQL).
Note5:Typical specifications represent the most likely parametric norm at25˚C operation.
LM5033
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