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Analog Devices Inc./Maxim Integrated DS3992Z-09N+
- Part No.:
- DS3992Z-09N+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Lighting, Ballast Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS3992Z-09N+.pdf
- Description:
- IC CCFL CNTRL 80KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,228
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Product details
Overview
DS3992Z-09N+ from Maxim Integrated is a two-channel push-pull cold-cathode fluorescent lamp (CCFL) controller for LCD backlighting, operating from 4.5V to 5.5V supply, delivering ±10% lamp frequency accuracy (40–80 kHz), ±10% burst-dimming frequency accuracy (90–220 Hz), and supporting negative-slope analog brightness control (2.0V min / 0.5V max). It drives dual logic-level n-channel MOSFETs per channel in PC monitor and TV LCD inverters.
For engineers reviewing the DS3992Z-09N+ datasheet, DS3992Z-09N+ pinout, DS3992Z-09N+ application, or DS3992Z-09N+ equivalent, key selection criteria include its per-channel fault monitoring (lamp open, overcurrent, strike failure, overvoltage), soft-start dimming to suppress audible transformer noise, strike-frequency boost (+33%), and SO-16 (150-mil) package compatibility with standard CCFL inverter layouts.
Technical Context
The DS3992Z-09N+ implements independent per-channel control using two internal oscillators: one for lamp drive (40–80 kHz, set by LOSC resistor) and one for digital pulse-width-modulated (DPWM) burst dimming (90–220 Hz, set by POSC resistor). Both oscillators exhibit ±10% tolerance over temperature and supply voltage.
Its gate drivers (GA1/GB1/GA2/GB2) deliver fast rise/fall times (50–100 ns into 600 pF) and support logic-level n-MOSFETs directly; fault detection uses dedicated LCM and OVD inputs referenced to 1.35 VDC bias, with thresholds defined relative to that reference (e.g., lamp-off at 1.75 V, overcurrent at 3.35 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Lamp Frequency Range | 40 kHz to 80 kHz - sets AC output waveform fundamental for CCFL ionization and stable operation |
| Burst Dimming Frequency | 90 Hz to 220 Hz - defines DPWM cycle rate for analog-controlled brightness modulation |
| Supply Voltage | 4.5 V to 5.5 V - single-rail operation compatible with standard 5 V system rails |
| Operating Temperature | −40°C to +85°C - supports industrial-grade LCD monitor and TV ambient conditions |
| Package | 16-pin SO (150 mil) - surface-mount footprint with three VCC pins and GND for low-noise power delivery |
| BRIGHT Polarity | Negative - brightness increases as input voltage decreases from 2.0 V to 0.5 V |
| Gate Drive Rise/Fall Time | 50 ns to 100 ns (CL = 600 pF) - ensures fast MOSFET switching with minimal overlap loss in push-pull topology |
Pinout & Package
DS3992Z-09N+ is housed in a 16-pin small-outline (SO-16, 150-mil body width) package with exposed pad not present; pin 1 is top-left corner marked by dot or notch, and pins 10, 15, and 16 are all VCC connections for robust decoupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LOSC) | Lamp oscillator resistor adjust | Sets 40–80 kHz lamp frequency via external RLOSC to ground (R × f = 1.6E9 Ω·Hz) |
| 2 (POSC) | DPWM oscillator resistor adjust | Sets 90–220 Hz burst dimming frequency via external RPOSC to ground (R × f = 4.0E6 Ω·Hz) |
| 3 (BRIGHT) | Analog brightness control input | Negative-slope interface: 2.0 V = minimum brightness, 0.5 V = maximum brightness |
| 4 (SVM) | Inverter supply voltage monitor | 2.0 V threshold triggers lamp shutdown if DC inverter rail falls below configured trip point |
| 5 (GA1), 6 (GB1) | Channel 1 gate drivers | Complementary push-pull outputs driving n-MOSFET gates directly; duty cycle modulated for current regulation |
| 7 (LCM1), 8 (OVD1) | Channel 1 fault sense inputs | Monitor lamp current (via series resistor) and lamp voltage (via capacitor divider); referenced to 1.35 VDC bias |
| 9 (GND) | Signal ground | Reference for all analog inputs and internal bias generation |
| 10, 15, 16 (VCC) | Power supply | Three dedicated 4.5–5.5 V supply pins reduce IR drop and improve noise immunity across high-current gate drive paths |
| 11 (GA2), 12 (GB2) | Channel 2 gate drivers | Independent push-pull outputs identical in function and timing to GA1/GB1 |
| 13 (LCM2), 14 (OVD2) | Channel 2 fault sense inputs | Duplicate of LCM1/OVD1 functionality for second CCFL channel; fully isolated monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel lamp fault monitoring | Detects open-lamp, overcurrent, strike failure, and overvoltage independently on each channel without cross-talk |
| Burst-dimming soft-start | Ramps lamp current at DPWM cycle onset to eliminate audible transformer ringing during brightness transitions |
| Lamp strike frequency boost | Increases lamp oscillator frequency by 33% during ignition to raise peak voltage and ensure reliable cold-start |
| Accurate dual-oscillator system | Separate ±10% lamp and DPWM oscillators enable precise, stable dimming and lamp regulation across temperature |
| Minimal external BOM | Requires only two resistors (LOSC, POSC), two feedback dividers, and dual n-MOSFETs per channel for full inverter implementation |
Applications
| PC Monitor Backlight Inverter | LCD-TV Backlight Inverter |
|---|---|
Use Scenario: Driving four or six CCFLs in 17–24 inch desktop LCD monitors with analog brightness control from host MCU. IC Role / Device Role / Timing Role: Two-channel push-pull CCFL controller generating 40–80 kHz AC lamp drive and 90–220 Hz burst-dimming envelope. Use Value: Enables compact, low-cost inverter design with per-lamp fault isolation and negative-slope BRIGHT interface matching legacy monitor firmware. |
Use Scenario: Powering dual CCFL banks in 32–42 inch LCD TVs requiring high reliability and audible-noise suppression. IC Role / Device Role / Timing Role: Independent channel control with strike-frequency boost and soft-start dimming to prevent transformer buzz during channel-on events. Use Value: Delivers consistent lamp brightness across wide temperature range (−40°C to +85°C) while maintaining <10% lamp current regulation error. |
| Industrial Panel Display Inverter | Medical Imaging Display Inverter |
Use Scenario: Backlighting ruggedized LCD panels in factory HMIs where EMI and thermal stability are critical. IC Role / Device Role / Timing Role: Dual-channel CCFL driver with UVLO (4.3 V rising) and SVM undervoltage protection to maintain safe operation during brownouts. Use Value: Ensures fail-safe lamp shutdown before inverter component overstress, meeting IEC 61000-4-11 immunity requirements. |
Use Scenario: Illuminating diagnostic-grade grayscale LCDs in ultrasound and X-ray viewing stations requiring flicker-free, stable luminance. IC Role / Device Role / Timing Role: Precision lamp current regulation via LCM feedback and overvoltage clamping via OVD inputs to prevent image distortion. Use Value: Maintains <±2% luminance uniformity across 10,000-hour lifetime by rejecting lamp aging effects through closed-loop current control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCFL controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS3992Z-09P+ | Identical lamp/DPWM frequencies and package, but positive-slope BRIGHT interface (0.5 V min / 2.0 V max) | Requires inverted analog control signal; incompatible with negative-slope firmware without level-shifting | Select DS3992Z-09P+ only when host system provides increasing voltage for higher brightness |
| MAX8722AESE+ | Single-channel CCFL controller with integrated 5 V LDO, no SVM input, and fixed 200 Hz DPWM frequency | Lacks per-channel fault isolation and programmable dimming frequency; requires external 5 V regulator | Choose MAX8722AESE+ only for cost-sensitive single-lamp designs where SVM monitoring is unnecessary |
Compared with DS3992Z-09P+, DS3992Z-09N+ enables direct integration with legacy negative-slope brightness DACs without signal inversion; compared with MAX8722AESE+, it provides dual-channel independence, programmable DPWM range, and inverter-supply monitoring-critical for multi-lamp reliability in monitors and TVs.
Availability
DS3992Z-09N+ is available at Aetrix Electronics and suitable for LCD PC monitor backlighting, LCD-TV inverter modules, and industrial panel display systems requiring stable component supply, long-lifecycle availability, and lead-free compliance.
Supply support for DS3992Z-09N+ 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, computing, and consumer applications.
The DS3992Z-09N+ belongs to Maxim's CCFL backlight controller product line, designed specifically for cost-effective, high-reliability LCD inverter solutions in PC monitors and TVs with dual-lamp support and comprehensive fault handling.
FAQ
What is the lamp frequency tolerance of DS3992Z-09N+ over temperature and supply voltage?
The DS3992Z-09N+ lamp oscillator exhibits ±10% frequency tolerance across −40°C to +85°C and 4.5 V to 5.5 V VCC, as confirmed by LOSC resistor ±2% drift and internal oscillator design. This tolerance applies directly to the 40–80 kHz lamp drive output used for CCFL excitation and is specified in the Electrical Characteristics table under "Lamp Frequency Tolerance".
How does the negative BRIGHT polarity of DS3992Z-09N+ affect system-level brightness control?
The DS3992Z-09N+ uses negative-slope analog dimming: brightness is minimum at 2.0 V on the BRIGHT pin and maximum at 0.5 V. This matches legacy monitor designs where DAC outputs decrease to increase backlight intensity. The linear relationship between 0.5 V and 2.0 V ensures predictable 100% to <10% dimming range without firmware modification.
Can DS3992Z-09N+ drive more than one CCFL per channel?
Yes, DS3992Z-09N+ supports multiple CCFLs per channel using wired-OR feedback configurations, as documented in the Typical Operating Circuits section. Each channel maintains independent lamp current regulation and fault detection, enabling reliable 4-lamp or 6-lamp implementations in PC monitors and TVs without additional controllers.
What protection features does DS3992Z-09N+ provide against inverter supply faults?
DS3992Z-09N+ includes dual undervoltage lockout (UVLO) circuits: one for its own VCC supply (4.3 V rising threshold) and one for the external DC inverter supply monitored at the SVM pin (2.0 V threshold). If SVM drops below 2.0 V, lamps shut off immediately and the controller resets-preventing operation under unsafe inverter rail conditions.
What is the purpose of the three VCC pins on DS3992Z-09N+?
The DS3992Z-09N+ has three dedicated VCC pins (pins 10, 15, 16) to minimize supply impedance and decoupling path inductance for high-speed gate drivers. Pin 10 is recommended for local 0.01 µF or 0.1 µF ceramic decoupling; pins 15 and 16 require connection to 4.5–5.5 V but do not need separate capacitors-this layout reduces noise coupling between channels and improves current regulation stability.
DS3992Z-09N+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- CCFL Controller
- Frequency:
- 40kHz ~ 80kHz
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply:
- 8 mA
- Current - Output Source/Sink:
- -
- Dimming:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
DS3992Z-09N+ FAQ
1.How can I place an order for DS3992Z-09N+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS3992Z-09N+ 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 DS3992Z-09N+ reliable?
The price and inventory of DS3992Z-09N+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS3992Z-09N+ is usually 5 days.
3.What payment methods are accepted for DS3992Z-09N+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS3992Z-09N+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS3992Z-09N+?
DS3992Z-09N+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS3992Z-09N+ 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 DS3992Z-09N+?
For technical support, including DS3992Z-09N+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS3992Z-09N+ requirements.
6.How does Aetrix verify that DS3992Z-09N+ is sourced from the original manufacturer or authorized distributors?
All DS3992Z-09N+ 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 DS3992Z-09N+ meets industry standards.
7.What is the process for return or replacement of DS3992Z-09N+?
All DS3992Z-09N+ units undergo pre-shipment inspection (PSI). If there is an issue with DS3992Z-09N+, 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 DS3992Z-09N+ part is unused and in its original packaging.
Return procedure for DS3992Z-09N+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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