Features Two independent PWM current mode controllers Integrated high voltage startup regulator Compound 2.5A main output gate drivers Single resistor oscillator setting to 2 MHz Synchronizable oscillator Active clamp gate driver for P-channel MOSFETs Adjustable gate drive overlap time Programmable maximum duty cycle Maximum duty cycle fold-back at high line voltage Adjustable timer for hiccup mode current limiting Integrated slope compensation Adjustable line under-voltage lockout Independently adjustable soft-start (each regulator) Direct interface with opto-coupler transistor Thermal shutdown Description The LM5034 dual current mode PWM controller contains all the features needed to control either two independent forward/active clamp dc/dc converters or a single high current converter comprised of two interleaved power stages. The two controller channels operate 180° out of phase thereby reducing input ripple current. The LM5034 includes a startup regulator that operates over a wide input range up to 100V and compound (bipolar + CMOS) gate drivers that provide a robust 2.5A peak sink current. The adjustable dead-time of the active clamp gate drivers and adjustable maximum PWM duty cycle reduce stress on the primary side MOSFET switches. Additional features include programmable line under-voltage lockout, cycle-by-cycle current limit, hiccup mode fault operation with adjustable restart delay, PWM slope compensation, soft-start, and a 2 MHz capable oscillator with synchronization capability. Applications Telecommunication Power Converters Industrial Power Converters +42V Automotive Systems

Also Recommended LM5026▲ Single Active Clamp Forward Controller LM5110 Dual 5A Low Side Gate Driver

Typical Application click for larger image	Block Diagram *click for larger image
Typical Performance *click for larger image

Parameters / Values	LM5034	LM5026
PWM Mode	Current	Current
Topology	Forward Active Clamp	Forward Active Clamp
Input Min Voltage	13 Volt	8 Volt
Input Max Voltage	100 Volt	100 Volt
Frequency Max	1000 kHz	1000 kHz
Efficiency (peak)	94 %	92.5 %
Adj Switch Frequency	Yes	Yes
Frequency Min	100 kHz	100 kHz
Sync Pin	Yes	Yes
Sync Type	Up	Input, Output
UVLO	Yes	Yes
On/Off Pin	Yes	Yes
PowerGood / Error Flag	No	No
Current Limit Type	cycle-cycle, hiccup	cycle-cycle, hiccup
Gate Drive	2.5 Amp	3 Amp
Output Range	NA	Undefined
Special Features	Controls dual or single interleaved converter	High bandwidth opto interface; programmable max. duty cycle
Temperature Min	-40 deg C	-40 deg C
Temperature Max	125 deg C	125 deg C
Step-Down	Yes	Yes
Step-Up	Yes	Yes
Flyback	No	Yes
Inverting	Yes	Yes
RegType	Switching Controller	Switching Controller
Adjustable Output	Yes	Yes
Output Power	600 Watt	300 Watt
Switching Frequency	2000 kHz	1000 kHz
Multiple Output Capability	Yes	Yes
PowerWise	Yes	Yes

Datasheets

Title		Size	Date	Other Language
	LM5034 High Voltage Dual Interleaved Current Mode Controller with Active Clamp	1075 Kbytes	15-Feb-05

Application Notes

Title		Size	Date	Other Language
	AN-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge	230 Kbytes	2-Jul-08
	AN-1370: Application Note 1370 LM5034 Evaluation Board	1036 Kbytes	22-Feb-05
	AN-1574: Application Note 1574 LM5073 Evaluation Board	464 Kbytes	24-Apr-07

Other Technical Documents

Title		Type	Date
	Operation and Benefits of Active-Clamp Forward Power Converters	Power Designer	2007-03-22
	Inside Current-Mode Control	Power Designer	2007-03-22

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM5034MTC/NOPB LM5034MTC RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 343 AVNET-EM Worldwide 87 DIGI-KEY Worldwide 91 FARNELL Europe and Asia 70 MOUSER Worldwide 114 NEWARK Americas 70 RS COMPONENTS Worldwide 17 TAYLOR Americas 343	$1.90 each at 1K+ pcs	rail of 73
LM5034MTCX/NOPB RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 2500 CEAC Asia Pacific 45000 DIGI-KEY Worldwide 0 TAYLOR Americas 2500	$1.90 each at 1K+ pcs	reel of 2500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM5034.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM5034 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM5034EVAL	High Voltage Dual Interleaved Current Mode Controller with Active Clamp	Full production	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 2	$204.00 each	1
LM5034 High Voltage Dual Interleaved Current Mode Controller with Active Clamp Features: Two Independent PWM Current Mode Integrated High Voltage Startup Regulator Compound 2.5 A Main Output Gate Drivers Single Resistor Oscillator Setting to 2 MHz Synchronizable Oscillator Active Clamp Gate Driver for P-Channel MOSFETs Adjustable Gate Drive Overlap Time Programmable Maximum Duty Cycle Maximum Duty Cycle Fold-Back at High Line Voltage Adjustable Timer for Hiccup Mode Current Limiting Integrated Slope Compensation Adjustable Line Under-Voltage Lockout Independently Adjustable Soft-Start (Each Regulator) Direct Interface with Opto-Coupler Transistor Thermal Shutdown Applications: Telecommuncations Power Converters Industrial Power Converters +42 V Automotive Systems Contents: A fully assembled LM5034 evaluation board LM5034 datasheet LM5034 eval board appnote

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM5034MTC/NOPB LM5034MTC	71.681 72.001	TSSOP	20	1 1	260 260	Detail	Download	N/A	NSUZXYTT LM5034 MT
LM5034MTCX/NOPB	71.681	TSSOP	20	1	260	Detail	Download	N/A	NSUZXYTT LM5034 MT

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM5034.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM5034 is located at RoHS Status.

CAD Symbols and Models Download LM5034 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM5034MTC	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5034MTCX	ABCD150XV1	0	3868	0	0	2595000	2	736338335

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM5034.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM5034 is located at RoHS Status.