lm5034mtcx National Semiconductor Corporation, lm5034mtcx Datasheet - Page 2

• Manufacturer Part Number: lm5034mtcx
• Description: High Voltage Dual Interleaved Current Mode Controller With Active Clamp
• Manufacturer: National Semiconductor Corporation

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Connection Diagram
Ordering Information
Pin Description
PIN
1
2
3
4
5
Order Number
LM5034MTC
LM5034MTCX
COMP1
NAME
OVLP
CS1
SS1
VIN
Active Clamp Overlap Adjust
Input Supply
PWM Control, Controller 1
Current Sense Input, Controller 1
Soft-start, Controller 1
DESCRIPTION
Package Type
TSSOP-20
TSSOP-20
An external resistor (10 kΩ to 100 kΩ) sets the overlap time of the
active clamp outputs relative to the main outputs for both Controller 1
and Controller 2. The overlap time results in deadtime between each
main switch and its active clamp switch.
Input to the startup regulator. The operating input range is 13V to
100V with transient capability to 105V.
The COMP1 input provides voltage feedback to the PWM comparator
inverting input of Controller 1 through a 3:1 divider. The OUT1 duty
cycle increases as the COMP1 voltage increases. An internal 5KΩ
pull-up resistor to +5.0V provides bias current to an opto-coupler
transistor.
Input for current mode control and the current limit sensing. If the CS1
pin exceeds 0.5V the OUT1 pulse is terminated producing
cycle-by-cycle current limiting. External resistance connected to CS1
will adjust (increase) PWM slope compensation. This pin’s voltage
must not exceed 1.25V.
An internal 50 µA current source charges an external capacitor to set
the soft-start rate. During a current limit restart sequence, the internal
current source is reduced to 1 µA to increase the delay before retry.
Forcing SS1 below 0.5V shuts off Controller 1.
20-Lead TSSOP
NSC Package Drawing
MTC-20
MTC-20
Top View
2
APPLICATIONS INFORMATION
20136802
Supplied As
73 Units per Rail
2500 Units on Tape and Reel