LM25183-Q1.HTML

LM25183 42-VIN PSR Flyback DC/DC Converter with 65-V, 2.5-A Power MOSFET

Manufacturer

Texas Instruments

Overview

Part: LM25183 from Texas Instruments

Type: PSR Flyback DC/DC Converter

Key Specs:

Input voltage range: 4.5 V to 42 V (operation down to 3.5 V after start-up)
Total output regulation accuracy: ±1.5%
Junction temperature range: –40°C to +150°C
Integrated power MOSFET: 65-V, 0.11-Ω, 2.5-A
Output power: up to 10 W

Features:

Functional Safety-Capable
Robust solution with only one component crossing the isolation barrier
Optional VOUT temperature compensation
Input UVLO and thermal shutdown protection
Hiccup-mode overcurrent fault protection
No optocoupler or transformer auxiliary winding required for VOUT regulation
Internal loop compensation
Quasi-resonant MOSFET turnoff in BCM
External bias option for improved efficiency
Single- and multi-output implementations
Soft switching avoids diode reverse recovery
Optimized for CISPR 32 EMI requirements
Output voltage set by one resistor
Internally-fixed or externally-programmable soft-start
Precision enable input with hysteresis for adjustable line UVLO
Automatic recovery from thermal shutdown

Applications:

Motor drives: IGBT and SiC gate driver supplies
Isolated field transmitters
Isolated field actuators
Isolated bias power rails

Package:

WSON (8): 4.00 mm × 4.00 mm

Features

Functional Safety-Capable
- Documentation available to aid functional safety system design
Designed for reliable and rugged applications
- Wide input voltage range of 4.5 V to 42 V with operation down to 3.5 V after start-up
- Robust solution with only one component crossing the isolation barrier
- ±1.5% total output regulation accuracy
- Optional VOUT temperature compensation
- Input UVLO and thermal shutdown protection
- Hiccup-mode overcurrent fault protection
- –40°C to +150°C junction temperature range
Integration reduces solution size and cost
- Integrated 65-V, 0.11-Ω power MOSFET
- No optocoupler or transformer auxiliary winding required for VOUT regulation
- Internal loop compensation
High-efficiency PSR flyback operation
- Quasi-resonant MOSFET turnoff in BCM
- External bias option for improved efficiency
- Single- and multi-output implementations
Ultra-low conducted and radiated EMI signatures
- Soft switching avoids diode reverse recovery
- Optimized for CISPR 32 EMI requirements
Create a custom flyback regulator design using WEBENCH® Power Designer

Applications

Motor drives: IGBT and SiC gate driver supplies
Isolated field transmitters and field actuators
Isolated bias power rails

Typical Application

Pin Configuration

Figure 5-1. 8-Pin WSON NGU Package With Wettable Flanks (Top View)

Electrical Characteristics

Typical values correspond to T^J = 25°C. Minimum and maximum limits aaply over the full –40°C to 150°C junction temperature range unless otherwise indicated. VIN = 12 V and VEN/UVLO = 2 V unless otherwise stated.

PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
SUPPLY CURRENT
ISHUTDOWN	VIN shutdown current	VEN/UVLO = 0 V		1.8		μA
IACTIVE	VIN active current	VEN/UVLO = 2.5 V, VRSET = 1.8 V		260	375	μA
IACTIVE-BIAS	VIN current with BIAS connected	VSS/BIAS = 5 V		25	50	μA
	ENABLE AND INPUT UVLO
VSD-FALLING	Shutdown threshold	VEN/UVLO falling	0.3			V
VSD-RISING	Standby threshold	VEN/UVLO rising		0.8	1	V
VUV-RISING	Enable threshold	VEN/UVLO rising	1.45	1.5	1.53	V
VUV-HYST	Enable voltage hysteresis	VEN/UVLO falling	0.04	0.05		V
IUV-HYST	Enable current hysteresis	VEN/UVLO = 1.6 V	4.2	5	5.5	μA
FEEDBACK
IRSET	RSET current	RRSET = 12.1 kΩ		100		μA
VRSET	RSET regulation voltage	RRSET = 12.1 kΩ	1.194	1.21	1.22	V
VFB-VIN1	FB to VIN voltage	IFB = 80 μA	–50			mV
VFB-VIN2	FB to VIN voltage	IFB = 120 μA			50	mV
	SWITCHING FREQUENCY
FSW-MIN	Minimum switching frequency			12		kHz
FSW-MAX	Maximum switching frequency			350		kHz
tON-MIN	Minimum switch on-time			140		ns
	DIODE THERMAL COMPENSATION
VTC	TC voltage	ITC = ±10 μA, TJ = 25°C		1.2	1.27	V
POWER SWITCHES
RDS(on)	MOSFET on-state resistance	ISW = 100 mA, TJ = 25°C		0.11	0.135	Ω
SOFT-START AND BIAS
ISS	SS ext capacitor charging current			5		μA
tSS	Internal SS time			6		ms
VBIAS-UVLO RISE	BIAS enable voltage	VSS/BIAS rising		4.25	4.45	V
VBIAS-UVLO HYST	BIAS UVLO hysteresis	VSS/BIAS falling		130		mV
CURRENT LIMIT
ISW-PEAK	Peak current limit threshold		2.2	2.5	2.65	A
THERMAL SHUTDOWN
TSD	Thermal shutdown threshold	TJ rising		175		°C
TSD-HYS	Thermal shutdown hysteresis			10		°C

Absolute Maximum Ratings

Over the recommended operating junction temperature range of –40°C to 150°C (unless otherwise noted)(1)

		MIN	MAX	UNIT
	VIN to GND	–0.3	45
	EN/UVLO to GND	–0.3	45
	TC to GND	–0.3	6
Input voltage	SS/BIAS to GND	–0.3	14	V
	FB to GND	–0.3	45.3
	FB to VIN	–0.3	0.3
	RSET to GND	–0.3	3
	SW to GND	–1.5	70
Output voltage	SW to GND (20-ns transient)	–3		V
Operating junction temperature, TJ		–40	150	°C
Storage temperature, Tstg		–55	150	°C

⁽¹⁾ Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Recommended Operating Conditions

Over the recommended operating junction temperature range of –40°C to 150°C (unless otherwise noted)

		MIN	MAX	UNIT
VIN	Input voltage	4.5	42	V
VSW	SW voltage		65	V
VEN/UVLO	EN/UVLO voltage		42	V
VSS/BIAS	SS/BIAS voltage		13	V
TJ	Operating junction temperature	–40	150	°C

Thermal Information

		LM25183
	THERMAL METRIC(1)	NGU (WSON)
		8 PINS
RΘJA	Junction-to-ambient thermal resistance	40.9
RΘJC(top)	Junction-to-case (top) thermal resistance	36.9
RΘJB	Junction-to-board thermal resistance	17.7
ΨJT	Junction-to-top characterization parameter	0.4
ΨJB	Junction-to-board characterization parameter	17.7
RΘJC(bot)	Junction-to-case (bottom) thermal resistance	2.7

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics report.

Product Folder Links: LM25183

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
LM25183	Texas Instruments	—
LM25183-BASED	Texas Instruments	—
LM25183-Q1	Texas Instruments	—
LM25183NGUR	Texas Instruments
LM25183NGUR.A	Texas Instruments	—

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