Features Internal Start-up Bias Regulator 3A Compound Main Gate Driver Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis Voltage Mode Control with Feed-Forward Adjustable Dual Mode Over-Current Protection Programmable Overlap or Deadtime between the Main and Active Clamp Outputs Volt x Second Clamp Programmable Soft-start Leading Edge Blanking Single Resistor Programmable Oscillator Oscillator UP / DOWN Sync Capability Precision 5V Reference Thermal Shutdown Description The LM5025A is a functional variant of the LM5025 active clamp PWM controller. The functional differences of the LM5025A are: The CS1 and CS2 current limit thresholds have been increased to 0.5V. The internal CS2 filter discharge device has been disabled and no longer operates each clock cycle. The internal VCC and VREF regulators continue to operate when the line UVLO pin is below threshold. The LM5025A PWM controller contains all of the features necessary to implement power converters utilizing the Active Clamp / Reset technique. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp / reset techniques. Two control outputs are provided, the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The two internal compound gate drivers parallel both MOS and Bipolar devices, providing superior gate drive characteristics. This controller is designed for high-speed operation including an oscillator frequency range up to 1MHz and total PWM and current sense propagation delays less than 100ns. The LM5025A includes a high-voltage start-up regulator that operates over a wide input range of 13V to 90V. Additional features include: Line Under Voltage Lockout (UVLO), softstart, oscillator UP/DOWN sync capability, precision reference and thermal shutdown.

Also Recommended LM5025▲ Active Clamp Voltage Mode PWM Controller LM5034▲ Active Clamp Dual Interleaved Current Mode Controller LM5110 Dual 5A Compound Gate Driver With Negative Drive Capability LM5112 High Current 7A Single Low-Side Mosfet Driver

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

Parameters / Values	LM5025A	LM5025	LM5034
PWM Mode	Voltage/Feed-forward	Voltage/Feed-forward	Current
Topology	Forward Active Clamp	Forward Active Clamp	Forward Active Clamp
Input Min Voltage	8 Volt	8 Volt	13 Volt
Input Max Voltage	90 Volt	90 Volt	100 Volt
Frequency Max	1000 kHz	1000 kHz	1000 kHz
Efficiency (peak)	92.5 %	92.5 %	94 %
Adj Switch Frequency	Yes	Yes	Yes
Frequency Min	100 kHz	100 kHz	100 kHz
Sync Pin	Yes	Yes	Yes
Sync Type	Up, down	Up, down	Up
UVLO	Yes	Yes	Yes
On/Off Pin	Yes	Yes	Yes
PowerGood / Error Flag	No	No	No
Current Limit Type	cycle-cycle, hiccup	cycle-cycle, hiccup	cycle-cycle, hiccup
Gate Drive	3 Amp	3 Amp	2.5 Amp
Temperature Min	-40 deg C	-40 deg C	-40 deg C
Temperature Max	125 deg C	125 deg C	125 deg C
Step-Down	Yes	Yes	Yes
Step-Up	Yes	Yes	Yes
Flyback	Yes	No	No
Inverting	Yes	Yes	Yes
RegType	Switching Controller	Switching Controller	Switching Controller
Adjustable Output	Yes	Yes	Yes
Output Power	300 Watt	300 Watt	600 Watt
Switching Frequency	1000 kHz	1000 kHz	2000 kHz
Multiple Output Capability	Yes	Yes	Yes
PowerWise	Yes	Yes	Yes

Datasheets

Title		Size	Date	Other Language
	LM5025A Active Clamp Voltage Mode PWM Controller	391 Kbytes	12-Mar-10	日本語

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM5025AMTC/NOPB LM5025AMTC RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 6 AVNET-EM Worldwide 172 DIGI-KEY Worldwide 708 TAYLOR Americas 6	$1.25 each at 1K+ pcs	rail of 92
LM5025AMTCX/NOPB RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty AECO TECH Asia Pacific 868 AVNET-EM Worldwide 2500 CEAC Asia Pacific 277500 DIGI-KEY Worldwide 0 MOUSER Worldwide 2500 RSL MICRO Asia Pacific 10000	$1.25 each at 1K+ pcs	reel of 2500
LM5025ASD/NOPB LM5025ASD RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1000 DIGI-KEY Worldwide 2000 FARNELL Europe and Asia 24 TAYLOR Americas 1000	$1.25 each at 1K+ pcs	reel of 1000
LM5025ASDX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.25 each at 1K+ pcs	reel of 4500

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 LM5025A.

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 LM5025A is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM5025AEVAL/NOPB	Active Clamp Voltage Mode PWM Controller	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 2	$134.00 each	1
Features: Internal Start-up Bias Regulator 3 A Compound Main Gate Driver Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis Voltage Mode Control with Feed-Forward Adjustable Dual Mode Over-Current Protection Programmable Overlap or Deadtime between the Main and Active Clamp Outputs Volt x Second Clamp Programmable Soft-start Leading Edge Blanking Single Resistor Programmable Oscillator Oscillator UP / DOWN Sync Capability Precision 5 V Reference Thermal Shutdown Contents: A fully assembled LM5025A evaluation board LM5025A datasheet LM5025A 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
LM5025AMTC/NOPB LM5025AMTC	56.74 57	TSSOP	16	1 1	260 260	Detail	Download	spice file	NSUZXYTT L5025A MTC
LM5025AMTCX/NOPB	56.74	TSSOP	16	1	260	Detail	Download	spice file	NSUZXYTT L5025A MTC
LM5025ASD/NOPB LM5025ASD	64.927 65.192	LLP	16	1 1	260 260	Detail	Download	spice file	NS UZXYTT 5025ASD
LM5025ASDX/NOPB	64.927	LLP	16	1	260	Detail	Download	spice file	NS UZXYTT 5025ASD

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 LM5025A.

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 LM5025A is located at RoHS Status.

CAD Symbols and Models Download LM5025A CAD Symbols

Models spice file

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM5025AMTC	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5025AMTCX	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5025ASD	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5025ASDX	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 LM5025A.

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 LM5025A is located at RoHS Status.