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Monolithic Power Systems Inc. MP4651ES-LF-Z
- Part No.:
- MP4651ES-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP4651ES-LF-Z.pdf
- Description:
- IC LED DRIVER OFFL PWM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,807
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Product details
Overview
MP4651ES-LF-Z from Monolithic Power Systems is a fixed-frequency off-line LED driver IC designed for high-power isolated LED lighting systems. It delivers two 180° phase-shifted gate drive outputs (GL/GR), features a 9V enhanced gate driver, supports DC/PWM burst dimming with synchronization capability, and integrates open/short LED, overvoltage, and overtemperature protection. Used in LCD TV backlighting with transformer-coupled flyback or half-bridge topologies.
For engineers reviewing the MP4651ES-LF-Z datasheet, MP4651ES-LF-Z pinout, MP4651ES-LF-Z application, or MP4651ES-LF-Z equivalent, key selection criteria include its 50kHz typical operating frequency, 0.6V LED current sense reference, 2.38V OVP threshold, 7µs fault detection delay, and SOIC16 package compatibility with isolated gate drive transformer interfaces.
Technical Context
The MP4651ES-LF-Z implements a fixed-frequency PWM controller with internal oscillator set via FSET pin resistor (25kΩ → 50kHz). Its dual complementary gate drivers (GL/GR) are optimized for driving external MOSFETs through gate drive transformers in isolated AC/DC LED applications.
Burst dimming is managed by an integrated oscillator on BFS pin (programmable via RC network) and synchronized via SYNC pin pulses. Fault management uses dedicated comparators on OVP (2.38V), SSD (2.36V), and FB (1.2V) pins with 7µs detection delay and FT pin-based recovery timer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 46.5–53.5 kHz (set by 25kΩ FSET-to-GND resistor); enables stable transformer-coupled power stage design with low EMI. |
| LED Current Sense Reference | 0.6 V (±5%); regulates average LED current via FB pin with shunt resistor; enables precise constant-current control. |
| OVP Threshold | 2.38 V (typical); triggers fault mode if output voltage exceeds safe limit for >7 µs - protects against open-circuit LED string failure. |
| Gate Driver Output | 9.7 V (VCC), 1 A source / 2 A sink (GL/GR); directly drives gate windings of external isolation transformers without buffer stages. |
| Burst Dimming Control | 0–1.2 V DC input at PWMIN sets 0–100% duty cycle; supports external PWM sync up to 120% of BFS-set frequency. |
| Fault Recovery Timer | FT pin charges via 8 µA current; 10 nF capacitor yields ~3 ms delay before automatic system restart after fault clearance. |
| Input Voltage Range | 9 V to 30 V (VIN); powers internal regulator and gate driver; compatible with auxiliary supplies derived from offline rectified rails. |
Pinout & Package
MP4651ES-LF-Z is housed in a 16-pin SOIC package (JEDEC MS-012 AC compliant) with standard 1.27 mm pitch, 10.0 mm × 4.0 mm body, and exposed thermal pad not present. Pin 1 marked with notch or dot; pin numbering follows standard SOIC top-view counterclockwise convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OVP | Overvoltage sense input | Monitors LED string anode via resistive divider; fault triggered if voltage ≥2.38V for ≥7 µs. |
| 2 SYNC | Burst dimming synchronization input | Accepts narrow-pulse sync signal (>1.4V, >6 µs width); forces BFS oscillator reset to align burst timing across multiple drivers. |
| 3 SSD | Short-string detection input | Detects LED string short condition when voltage ≤2.36V for ≥7 µs; complements FB-based short detection. |
| 4 FB | LED current feedback input | Senses cathode-side shunt voltage; regulated to 0.6V avg; also detects short strings if voltage ≥1.2V for ≥7 µs. |
| 5 COMP | Compensation node | Connects to error amplifier output; requires 1–47 nF X7R ceramic cap to GND for loop stability in current regulation. |
| 6 FT | Fault timer capacitor connection | Charged by 8 µA current; voltage crossing 2.38V initiates automatic recovery after fault condition clears. |
| 7 PWMOUT | PWM dimming signal output | Drives external series MOSFET for fast LED on/off switching; pulled low during fault mode. |
| 8 FSET | Frequency set input | Resistor-to-GND sets oscillator frequency (e.g., 25kΩ → 50kHz); tolerance impacts timing accuracy. |
| 9 BFS | Burst frequency set node | RC network sets burst dimming frequency; can be overridden by external PWM via PWMIN when BFS pulled to VCC. |
| 10 PWMIN | Burst brightness control input | 0–1.2 V DC sets burst duty cycle linearly; logic-level PWM accepted when BFS is pulled high (20kΩ to VCC). |
| 11 EN | Enable control input | High (>2 V) enables IC; low (<1 V) disables all outputs and reduces quiescent current to 1 µA. |
| 12 VIN | Main supply input | 9–30 V input powering internal LDO; bypassed with ≥0.1 µF ceramic cap near pin for noise immunity. |
| 13 VCC | Internal LDO output & gate driver supply | 9.7 V (typical), 20 mA capable; powers gate drivers and external circuitry; bypassed with ≥1 µF ceramic cap. |
| 14 GL | Gate drive output A | 180° phase-shifted complement to GR; drives primary side of gate drive transformer; 1 A source / 2 A sink. |
| 15 GND | Power and signal ground | Common return for VIN, VCC, FB, COMP, FT, and logic circuits; must be low-impedance plane in layout. |
| 16 GR | Gate drive output B | 180° phase-shifted complement to GL; identical drive strength; used with GL for push-pull or phase-shifted full-bridge topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced 9V gate driver | Delivers 1 A source / 2 A sink per output (GL/GR), enabling direct drive of gate drive transformer primaries without external buffers. |
| Programmable burst dimming frequency | BFS pin accepts RC network to set 20–200 Hz burst range; supports synchronization to external clock for multi-channel timing alignment. |
| Fast PWM dimming with hold compensation | PWMOUT controls external dimming MOSFET while COMP network is disconnected during off-cycle, eliminating loop settling delay for flicker-free <1% duty cycles. |
| Multi-fault protection with auto-recovery | Dedicated comparators on OVP, SSD, and FB pins detect open/short LED conditions within 7 µs; FT pin enables timed restart without manual reset. |
| Phase-shifted dual gate outputs | GL and GR outputs are precisely 180° out-of-phase with fixed dead-time control, supporting transformer-isolated half-bridge and full-bridge LED driver topologies. |
Applications
| LCD TV Backlighting | LCD Monitor Backlighting |
|---|---|
|
Use Scenario: Driving high-voltage, high-current LED strings in edge-lit or direct-lit LCD TV panels requiring precise current regulation and flicker-free dimming. IC Role / Device Role / Timing Role: Primary PWM controller and gate driver for isolated flyback or half-bridge power stage; provides synchronized burst dimming across multiple channels. Use Value: Enables >10,000:1 contrast ratio via fast PWMOUT-triggered dimming MOSFET switching and COMP hold architecture, eliminating visible flicker at low brightness. |
Use Scenario: Powering compact LED arrays in desktop and professional LCD monitors where thermal constraints demand high efficiency and reliable fault handling. IC Role / Device Role / Timing Role: Off-line LED driver IC managing both power conversion (via GL/GR) and digital brightness control (via PWMIN/BFS/SYNC) in single-chip solution. Use Value: Integrated OVP, SSD, and FB fault detection with 7 µs response ensures immediate shutdown during LED string failure, protecting downstream components and meeting IEC 62368-1 safety requirements. |
| Flat Panel Video Displays | Commercial LED Lighting Systems |
|
Use Scenario: High-brightness video walls and digital signage using cascaded LED modules requiring synchronized dimming across large arrays. IC Role / Device Role / Timing Role: Synchronized burst dimming master - SYNC pin accepts common timing reference to align PWMOUT edges across dozens of MP4651ES-LF-Z units. Use Value: Eliminates beat frequencies and temporal misalignment between adjacent panels, ensuring uniform luminance and color consistency under dynamic content. |
Use Scenario: Industrial-grade LED luminaires for warehouse, street, or high-bay lighting where long service life and field-replaceability are critical. IC Role / Device Role / Timing Role: Robust off-line LED driver with built-in thermal foldback (via FT timer) and wide 9–30 V input range accommodating aging AC-DC supplies. Use Value: SOIC16 package allows automated assembly and rework; fault auto-recovery reduces maintenance downtime; RoHS-compliant LF-Z marking meets global environmental compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar off-line LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP4652ES-LF-Z | Higher 12V gate drive, extended 10–36V VIN range, improved thermal performance (θJA = 70°C/W), same pinout and feature set. | Preferred for higher ambient temperature environments (>85°C) or designs requiring tighter input voltage margin. | Select MP4652ES-LF-Z when upgrading thermal headroom or input range is required without PCB redesign. |
| UCC28810DR | TI analog-controlled LED driver with similar burst dimming but no SYNC pin; uses different compensation scheme and lacks SSD pin. | Requires external circuitry for short-string detection; less suitable for multi-unit synchronized systems. | Choose UCC28810DR only if TI ecosystem integration or legacy design reuse outweighs loss of SYNC and SSD functionality. |
Compared with MP4652ES-LF-Z, the MP4651ES-LF-Z offers lower gate drive voltage and narrower input range but maintains identical footprint and control interface - ideal for cost-sensitive, thermally benign designs. Versus UCC28810DR, it provides superior synchronization and integrated short-string detection, reducing BOM count and improving system-level reliability.
Availability
MP4651ES-LF-Z is available at Aetrix Electronics and suitable for LCD TV backlighting, flat panel video displays, commercial LED lighting systems, and industrial monitor applications requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP4651ES-LF-Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, LED lighting, and motor control applications.
The MP4651 belongs to MPS's off-line LED driver product line, engineered specifically for isolated, high-power LED backlighting and general illumination systems demanding robust fault protection, precise current regulation, and synchronized digital dimming.
FAQ
What is the minimum recommended bypass capacitance for the VCC pin?
A minimum 1 µF X7R ceramic capacitor must be placed between VCC and GND, located as close as possible to the IC. This stabilizes the 9.7 V internal LDO output, suppresses switching noise coupling into the gate driver supply, and prevents erratic operation during transient load changes on GL/GR outputs.
How does the MP4651ES-LF-Z achieve flicker-free PWM dimming at low duty cycles?
It disconnects the COMP compensation network from the error amplifier during PWMOUT low intervals, holding the integrator voltage. When PWMOUT goes high, regulation resumes instantly without loop settling delay - enabling sub-1% duty cycle dimming with no visible flicker or brightness nonlinearity.
Can the MP4651ES-LF-Z drive MOSFETs directly without a gate drive transformer?
No - GL and GR outputs are designed for transformer-coupled isolation in off-line applications. Their 1 A source / 2 A sink capability targets primary-side winding drive, not direct MOSFET gate charging. Direct drive would violate isolation requirements and exceed safe operating area limits under high-voltage transients.
What happens to the GL and GR outputs during a fault condition?
Both GL and GR are immediately disabled (high-impedance state), PWMOUT is actively pulled low, and the COMP node is discharged via 30 µA sink current. This halts power delivery to the LED string and prevents uncontrolled current flow while the FT timer initiates recovery sequence.
Is the 7 µs fault detection delay adjustable?
No - the 7 µs delay is fixed internally for OVP, SSD, and FB fault comparators and cannot be modified. It balances noise immunity against response speed; shorter delays increase susceptibility to false triggering from switching transients, especially in high-dV/dt isolated topologies.
What is the maximum allowable voltage on the PWMIN pin?
The absolute maximum rating for PWMIN is +6.5 V, but functional operation is limited to 0–1.2 V for DC dimming control. Exceeding 1.2 V may cause incorrect burst duty cycle interpretation or unintended logic-level behavior; always clamp with Zener or resistor divider if interfacing to 3.3 V or 5 V logic.
Does the MP4651ES-LF-Z support analog dimming via the FB pin?
No - FB is strictly a current-sense feedback input regulated to 0.6 V. Analog dimming is not supported. Brightness control is exclusively implemented via burst-mode (DC voltage or PWM signal on PWMIN) or fast PWM switching (via PWMOUT-driven external MOSFET).
MP4651ES-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Type:
- AC DC Offline Switcher
- Topology:
- Half-Bridge
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 9V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 50kHz
- Dimming:
- PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MP4651ES-LF-Z FAQ
1.How can I place an order for MP4651ES-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4651ES-LF-Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MP4651ES-LF-Z reliable?
The price and inventory of MP4651ES-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4651ES-LF-Z is usually 5 days.
3.What payment methods are accepted for MP4651ES-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4651ES-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4651ES-LF-Z?
MP4651ES-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4651ES-LF-Z order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MP4651ES-LF-Z?
For technical support, including MP4651ES-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4651ES-LF-Z requirements.
6.How does Aetrix verify that MP4651ES-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP4651ES-LF-Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP4651ES-LF-Z meets industry standards.
7.What is the process for return or replacement of MP4651ES-LF-Z?
All MP4651ES-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4651ES-LF-Z, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MP4651ES-LF-Z part is unused and in its original packaging.
Return procedure for MP4651ES-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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