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LM5020MM-1/NOPB
Texas Instruments
IC REG CTRLR FLYBACK 10MSOP
37274 Pcs New Original In Stock
Flyback Regulator Positive Output Step-Up/Step-Down DC-DC Controller IC 10-VSSOP
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5.0 / 5.0
- (372 Ratings)
LM5020MM-1/NOPB
Product Overview
1350707
DiGi Electronics Part Number
LM5020MM-1/NOPB-DGManufacturer
Texas Instruments
LM5020MM-1/NOPB
Description
IC REG CTRLR FLYBACK 10MSOPInventory
37274 Pcs New Original In Stock
Flyback Regulator Positive Output Step-Up/Step-Down DC-DC Controller IC 10-VSSOP
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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LM5020MM-1/NOPB Technical Specifications
Category
Power Management (PMIC), DC DC Switching Controllers
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Output Type
Transistor Driver
Function
Step-Up/Step-Down
Output Configuration
Positive
Topology
Flyback
Number of Outputs
1
Output Phases
1
Voltage - Supply (Vcc/Vdd)
8V ~ 15V
Frequency - Switching
200kHz ~ 630kHz
Duty Cycle (Max)
80%
Synchronous Rectifier
No
Clock Sync
Yes
Serial Interfaces
-
Control Features
Frequency Control, Soft Start
Operating Temperature
-40°C ~ 125°C (TJ)
Mounting Type
Surface Mount
Package / Case
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Supplier Device Package
10-VSSOP
Base Product Number
LM5020
Datasheet & Documents
HTML Datasheet
LM5020MM-1/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.31.0001
Additional Information
Other Names
-LM5020MM-1/NOPBCT
LM5020MM-1/NOPBCT
LM5020MM-1/NOPBTR
LM5020MM-1TR-NDR
LM5020MM-1CT-NDR
-LM5020MM
LM5020MM-1/NOPBDKR
-LM5020MM-1/NOPBCT-DG
*LM5020MM-1/NOPB
-LM5020MM-1-NDR
LM5020MM1NOPB
Standard Package
1,000
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
구매 후 피드백 요청에 대해 친절하게 답변해주셔서 고마웠어요.
de desembre 02, 2025
Their post-purchase support demonstrates genuine dedication to customer success.
de desembre 02, 2025
Excellent pricing combined with reliable after-sales support—highly recommended.
de desembre 02, 2025
Their products consistently meet my expectations for both cost and reliability.
de desembre 02, 2025
My inquiries were handled swiftly, making the entire experience very positive.
de desembre 02, 2025
The logistics process was transparent and swift, giving me confidence in their shipping system.
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Frequently Asked Questions (FAQ)
What are the key design-in risks when using the LM5020MM-1/NOPB in a high-temperature industrial flyback converter, and how can thermal overstress be avoided?
When designing with the LM5020MM-1/NOPB in high-temperature environments (e.g., industrial power supplies near 125°C ambient), the primary risk is junction temperature exceedance due to internal power dissipation from the high-side gate driver. Although the LM5020MM-1/NOPB supports operation up to 125°C junction temperature, inadequate PCB copper for thermal dissipation in the 10-VSSOP package can lead to premature thermal shutdown or long-term reliability degradation. To mitigate this, ensure at least 250 mm² of exposed copper connected to the thermal pad with multiple vias to an internal ground plane. Additionally, limit switching frequency to the lower end of its 200kHz–630kHz range to reduce gate drive losses when driving large MOSFETs.
Can the LM5020MM-1/NOPB directly replace the UC3844 in an existing flyback design, and what critical circuit changes are required?
While the LM5020MM-1/NOPB and UC3844 are both peak-current-mode flyback controllers, they are not drop-in replacements due to architectural differences. The LM5020MM-1/NOPB includes built-in undervoltage lockout (UVLO) with hysteresis and a higher Vcc start-up threshold (~8V) compared to the UC3844’s ~16V, requiring adjustment of the bias winding turns or startup resistor network. The LM5020MM-1/NOPB also operates at higher maximum frequencies (up to 630kHz vs. 500kHz) and has softer internal slope compensation, so the current sense resistor and loop compensation components may need redesign. Additionally, the LM5020MM-1/NOPB lacks a reference output, so voltage feedback must be handled externally via optocoupler and shunt reference.
How does the lack of synchronous rectification support in the LM5020MM-1/NOPB impact efficiency in low-voltage, high-current flyback designs?
The LM5020MM-1/NOPB controls only the primary-side MOSFET and does not provide a synchronous rectifier (SR) gate drive signal, which limits efficiency in low-output-voltage, high-current applications (e.g., 5V/3A) where secondary-side diode conduction losses dominate. In such cases, the standard Schottky diode at the secondary can waste over 30% of total losses. To maintain efficiency, consider implementing a post-regulator buck stage or switching to a controller with SR support like the UCC28742. Alternatively, use a very low forward-drop Schottky or ensure forced air cooling—though neither fully matches the benefits of true synchronous rectification available in newer TI controllers.
What are the stability risks when synchronizing the LM5020MM-1/NOPB to an external clock, and how should noise coupling be managed?
When synchronizing the LM5020MM-1/NOPB to an external clock via the RT/SS pin, improper filtering or routing can lead to jitter and instability due to noise coupling into this high-impedance node. The RT/SS pin serves dual functions—frequency setting and soft-start—so injecting noise through poor PCB layout can cause erratic ramp-up or switching frequency modulation. To mitigate risks, use a dedicated 0.1μF ceramic capacitor from RT/SS to ground near the IC, shield the trace, and avoid routing near switching nodes. If synchronizing, tie the synchronization signal through a 1kΩ series resistor to filter transients, and verify stability under load transients via load-step testing.
How do PCB layout choices affect EMI and control loop integrity when using the LM5020MM-1/NOPB in a compact flyback converter?
With the LM5020MM-1/NOPB, poor PCB layout can severely impact EMI and control loop stability due to the high di/dt in flyback topologies. Critical risks include noise coupling into the COMP pin (loop compensation) and the current sense (CS) pin, which can trigger false over-current shutdown. To ensure robustness, minimize the loop area of the primary-side switching path by placing the gate driver, MOSFET, and decoupling capacitor (<10mm trace length) in close proximity. Route the CS filter components (RC network) directly from the sense resistor to the CS pin with no vias or splits beneath. Use a guard ring around the RT/SS and COMP pins with grounded traces to reduce crosstalk. These practices maintain signal integrity and ensure the LM5020MM-1/NOPB operates reliably in space-constrained designs.
Quality Assurance (QC)
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LM5020MM-1/NOPB CAD Models
Texas Instruments LM5020MM-1/NOPB PCB symbols & footprints
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