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Overview
| Topology | Boost Converter |
| Input voltage | 4-36 V |
| Switching frequency | 200-2000 kHz |
| Output 1 | 36 V / 0.33 A |
| IC revision | B |
Description
Demonstration circuit DC2247A is a 36V 2A synchronous 2MHz boost LED driver featuring the LT®3922. It drives a single string of LEDs at 330mA up to 34V when VIN is between 7V and 28V. It runs down to 4VIN with reduced ILED and can withstand VIN as high as 36V, but has overvoltage lockout (OVLO) set for 28V for this application. DC2247A runs at 2MHz switching frequency. Spread spectrum frequency modulation (SSFM) can be turned on with a simple jumper, reducing EMI. DC2247A comes with low EMI features including optimized layout, SSFM, and input and output filters. It passes CISPR 25 class 5 conducted and radiated EMI. It is protected against both open and short LED conditions and reports the faults.
Features
- ±2% LED Current Regulation
- ±2% Output Voltage Regulation
- 5000:1 PWM Dimming at 100Hz
- 128:1 Internal PWM Dimming
- Spread Spectrum Frequency Modulation
- Silent Switcher® Architecture for Low EMI
- Operates in Boost, Buck Mode and Buck-Boost Mode
- 2.8V to 36V Input Voltage Range
- Up to 34V LED String Voltage
- 2A, 40V Internal Switches
- 200kHz to 2MHz with SYNC Function
- Analog or Duty Cycle LED Current Control
- Open/Short LED Protection and Fault Indication
- Thermally Enhanced 28-Lead (4mm × 5mm) QFN
Typical applications
- Machine Vision
- Automotive and Industrial Lighting
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | fres(MHz) | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(mΩ) | Type | Pins | Mount | L(mm) | H(mm) | IR(mA) | Working Voltage(V (AC)) | Operating Temperature | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-LHMI SMT Power Inductor, 4.7 µH, 2.95 A | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | Inductance4.7 µH | Performance Rated Current2.95 A | Saturation Current @ 10%2.45 A | Saturation Current @ 30%5.4 A | Self Resonant Frequency31 MHz | – | – | – | – | DC Resistance105 mΩ | – | Pins2 | MountSMT | Length4.45 mm | Height1.8 mm | – | – | Operating Temperature -40 °C up to +125 °C | –Check availability | |||
 | SPECWE-CBF SMT EMI Suppression Ferrite Bead, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | Impedance @ 100 MHz600 Ω | Maximum Impedance700 Ω | Maximum Impedance150 MHz | Rated Current 22000 mA | DC Resistance150 mΩ | TypeHigh Current | – | MountSMT | Length2 mm | Height0.0009 mm | Rated Current1500 mA | – | Operating Temperature -55 °C up to +125 °C | –Check availability | |||
| SPECWE-CBF SMT EMI Suppression Ferrite Bead, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | Impedance @ 100 MHz1500 Ω | Maximum Impedance1800 Ω | Maximum Impedance70 MHz | Rated Current 21000 mA | DC Resistance300 mΩ | TypeHigh Current | – | MountSMT | Length2 mm | Height0.9 mm | Rated Current700 mA | – | Operating Temperature -55 °C up to +125 °C | –Check availability | |||
 | SPECWR-PHD Jumper, –, – | Simulation– | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | – | – | – | – | – | – | Pins2 | – | – | – | Rated Current3000 mA | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | –Check availability | ||
 | SPECWR-PHD Pin Header, –, – | Simulation– | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | – | – | – | TypeStraight | Pins3 | MountTHT | Length6 mm | – | Rated Current2000 mA | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C | –Check availability | ||
 | SPECWR-PHD Pin Header, –, – | Simulation– | Availability – | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | – | – | – | TypeStraight | Pins6 | MountTHT | Length6 mm | – | Rated Current2000 mA | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C | –Check availability |
Availability Forecast
WE item number Packaging unitsLead time
––– weeks
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |
There is no forecast for this quantity request.
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