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Overview
FM8101 is a high-precision isolated flyback LED constant current control chip, the chip works in the inductor current discontinuous mode, suitable for 85VAC-265VAC full Voltage range isolated flyback LED lighting applications.
The FM8101 chip integrates a 650V power switch, adopts high-precision sampling, compensation circuit and high-voltage JFET power supply technology, without starting resistance and VCC capacitor, no need for auxiliary winding power supply and detection, to achieve high-precision LED constant current output and excellent line voltage regulation, plus precise and stable self-adaptation The technology makes the system peripheral very simple, and can realize high-precision constant current control under the condition of a very small number of peripheral devices, which greatly saves the system cost and volume, and can ensure the consistency of LED power parameters during mass production.
FM8101 has multiple protection functions, including LED short-circuit protection, open-circuit protection, chip temperature overheating adjustment function, etc.

Features
➢ No startup resistor, no VCC capacitor
➢ No need for auxiliary winding power supply and detection
➢ Wide voltage range input
➢ Integrated high voltage power supply function
➢ Output current accuracy ± 5%
➢ LED short circuit protection
➢ LED open circuit protection
➢ chip power supply under-voltage protection
➢ Overheat regulation function
➢ Available in SOP-7 package
➢ Isolated flyback

Applications
➢ LED downlight
➢ LED candle light
➢ LED bulb light
➢ Other LED lighting

■ Description

The FA7610CP(N), 7612CP(N) and 7617CP(N) are bipolar ICs containing basic circuits necessary for PWM-type switching power supply control.

To minimize the number of external discrete components, the FA7610CP(N) is provided for a flyback or step-up power supply circuit, the FA7612CP(N) for a step-down power-supply circuit and FA7617CP(N) for a flyback power supply circuit.

■ Features

FA7610CP(N)

• For flyback transformer-type or step-up power-supply circuit (maximum output duty = 64% typical)

• Totem-pole predriver

• PWM-type switching power supply control

• Low-voltage operation (VCC = 3.6 to 22V)

• Latch-mode short-circuit protection function (no malfunction by noise)

• Soft-start function

• Undervoltage lockout function

• One capacitor shared for short circuit protection and for soft start to minimize the number of external discrete components

FA7612CP(N)

• For step-down power-supply circuit (maximum output duty = up to 100%)

• Open collector output

• PWM-type switching power supply control

• Low-voltage operation (VCC = 3.6 to 22V)

• Latch-mode short-circuit protection function (no malfunction by noise)

• Soft-start function

• Undervoltage lockout function

• One capacitor shared for short circuit protection and for soft start to minimize the number of external discrete components

FA7617CP(N)

• For flyback transformer-type power-supply circuit (maximum output duty = 67% typical)

• Open collector output

• PWM-type switching power supply control

• Low-voltage operation (VCC = 3.6 to 22V)

• Latch-mode short-circuit protection function (no malfunction by noise)

• Soft-start function

• Undervoltage lockout function

• One capacitor shared for short circuit protection and for soft start to minimize the number of external discrete components

■ Applications

• Battery power supply for portable equipment

■ Description

The FA7610CP(N), 7612CP(N) and 7617CP(N) are bipolar ICs containing basic circuits necessary for PWM-type switching power supply control.

To minimize the number of external discrete components, the FA7610CP(N) is provided for a flyback or step-up power supply circuit, the FA7612CP(N) for a step-down power-supply circuit and FA7617CP(N) for a flyback power supply circuit.

■ Features

FA7610CP(N)

• For flyback transformer-type or step-up power-supply circuit (maximum output duty = 64% typical)

• Totem-pole predriver

• PWM-type switching power supply control

• Low-voltage operation (VCC = 3.6 to 22V)

• Latch-mode short-circuit protection function (no malfunction by noise)

• Soft-start function

• Undervoltage lockout function

• One capacitor shared for short circuit protection and for soft start to minimize the number of external discrete components

FA7612CP(N)

• For step-down power-supply circuit (maximum output duty = up to 100%)

• Open collector output

• PWM-type switching power supply control

• Low-voltage operation (VCC = 3.6 to 22V)

• Latch-mode short-circuit protection function (no malfunction by noise)

• Soft-start function

• Undervoltage lockout function

• One capacitor shared for short circuit protection and for soft start to minimize the number of external discrete components

FA7617CP(N)

• For flyback transformer-type power-supply circuit (maximum output duty = 67% typical)

• Open collector output

• PWM-type switching power supply control

• Low-voltage operation (VCC = 3.6 to 22V)

• Latch-mode short-circuit protection function (no malfunction by noise)

• Soft-start function

• Undervoltage lockout function

• One capacitor shared for short circuit protection and for soft start to minimize the number of external discrete components

■ Applications

• Battery power supply for portable equipment

DESCRIPTION

The LT®3477 is a current mode, 3A DC/DC step-up converter with dual rail-to-rail current sense amplifiers and an internal 3A, 42V switch. It combines a traditional voltage feedback loop and two unique current feedback loops to operate as a constant-current, constant-voltage source. Both current sense voltages are set at 100mV and can be adjusted independently using the IADJ1 and IADJ2 pins. Efficiency of up to 91% can be achieved in typical applications. The LT3477 features a programmable soft-start function to limit inductor current during start-up. Both inputs of the error amplifier are available externally allowing positive and negative output voltages (Boost, Inverting, SEPIC, flyback). The switching frequency is programmable from 200kHz to 3.5MHz through an external resistor.

Available in thermally enhanced 20-pin (4mm × 4mm) QFN and 20-pin TSSOP packages, the LT3477 provides a complete solution for both constant-voltage and constant-current applications.

FEATURES

■ Dual 100mV Rail-to-Rail current Sense Amplifiers

■ Wide Input Voltage Range: 2.5V to 25V

■ 3A, 42V Internal Switch

■ High Efficiency Power Conversion: Up to 93%

■ Drives LEDs in Boost, Buck-Boost or Buck Mode

■ Frequency Set by External Resistor: 200kHz to 3.5MHz

■ Programmable Soft-Start

■ Low VCESAT Switch: 0.3V at 2.5A

■ Capable of Positive and Negative Output Voltages

   (Boost, Inverting, SEPIC, flyback)

■ Available in Thermally Enhanced 20-Lead

   (4mm × 4mm) QFN and 20-Lead TSSOP Packages

  

APPLICATIONS

■ High Power LED driver

■ DSL Modems

■ Distributed Power

■ Input/Output current Limited Boost, SEPIC, Inverting, flyback Converters

■ constant-Voltage, constant-current Source

DESCRIPTION

The UTC UC1100 is a primary control unit for switch mode charger and adapter applications. The controlled variable is transferred by an auxiliary winding from the secondary to the primary side. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies.

The UTC UC1100 operates in primary-side sensing and regulation. Opto-coupler and TL431 could be eliminated. It also eliminates the need of loop compensation circuitry while maintaining stability. The UTC UC1100 achieves excellent regulation and high average efficiency, yet meets the requirement for no-load consumption less than 30mW.

The UTC UC1100 achieves high precision CV/CC regulation and high power efficiency. It offers comprehensive protection coverage with auto-recovery features including Cycle-by-cycle current limiting, output over voltage protection, feedback loop open protection, short circuit protection, leading edge blanking, VCC under voltage lockout, etc.

FEATURES

* Primary side control for rectangular constant current and constant voltage output

* 30mW no-load input power feasible

* Tight CC regulation performance

* Sub-microampere start-up current

* Eliminates control loop compensation circuitry

* Eliminates opto-coupler and secondary CV/CC control circuitry

* Random frequency modulation to reduce system EMI

* flyback topology in DCM operation

* Open feedback protection

* Built-in soft start

* Short circuit protection

DESCRIPTION

The LT3512 is a high voltage monolithic switching regula

tor specifically designed for the isolated flyback topology.

No third winding or opto-isolator is required for regula

tion as the part senses output voltage directly from the

primary-side flyback waveform. The device integrates a

420mA, 150V power switch, high voltage circuitry, and

control into a high voltage 16-lead MSOP package with

four leads removed.

FEATURES

4.5V to 100V Input Voltage Range

Internal 420mA, 150V Power Switch

Boundary Mode Operation

No Transformer Third Winding or Opto-Isolator Required for Regulation

Improved Primary-Side Winding Feedback Load Regulation

VOUT Set with Two External Resistors

BIAS Pin for Internal Bias Supply and Power Switch driver

No External start-up Resistor

16-Lead MSOP Package

APPLICATIONS

Isolated Telecom Power Supplies

Isolated Auxiliary/Housekeeping Power Supplies

Isolated Industrial, Automotive and Medical Power Supplies

Dimmable Quasi-Resonant Primary Side current-Mode Controller for LED Lighting with Thermal Fold-back

The NCL30083 is a PWM current mode controller targeting isolated flyback and non−isolated constant current topologies. The controller operates in a quasi−resonant mode to provide high efficiency. Thanks to a novel control method, the device is able to precisely regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler.

Features
• Quasi−resonant Peak current−mode Control Operation
• Primary Side Sensing (no optocoupler needed)
• Wide VCC Range
• Source 300 mA/Sink 500 mA Totem Pole driver with 12 V Gate Clamp
• Precise LED constant current Regulation ±1% Typical
• Line Feed−forward for Enhanced Regulation Accuracy
• Low LED current Ripple
• 250 mV ±2% Guaranteed Voltage Reference for current Regulation
• ~ 0.9 Power Factor with Valley Fill Input Stage
• Low Start−up current (13 A typ.)
• 5 State Quasi−log Dimmable
• Thermal Fold−back
• Programmable soft−start
• Wide Temperature Range of −40 to +125°C
• Pb−free, Halide−free MSL1 Product
• Robust Protection Features
   ♦ Over Voltage / LED Open Circuit Protection
   ♦ Over Temperature Protection
   ♦ Secondary Diode Short Protection
   ♦ Output Short Circuit Protection
   ♦ Shorted current Sense Pin Fault Detection

Typical Applications
• Integral LED Bulbs
• LED Power driver Supplies
• LED Light Engines

General Description

The AP3766 is a high performance AC/DC power supply controller for battery charger and adapter applica tions. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies.

Features

· Primary Side Control for Rectangular constant current and constant Voltage Output

· Sub-microampere start-up current

· 30mW No-load Input Power Feasible

· Tight CC Regulation Performance

· Eliminates Opto-coupler and Secondary CV/CC Control Circuitry

· Eliminates Control Loop Compensation Circuitry

· flyback Topology in DCM Operation

· Random Frequency Modulation to Reduce System EMI

· Built-in Soft Start

· Open Feedback Protection

· Short Circuit Protection

· SOT-23-6 Package

Applications

· Adapters/Chargers for Cell/Cordless Phones, PDAs, MP3 and Other Portable Apparatus

· LED drivers

· Standby and Auxiliary Power Supplies

BP9021 is a high precision PSR constant current LED driver chips. chip inductor current in discontinuous mode for 85Vac ~ 265Vac full range of input voltage, power 3W or less anti-Isolated flyback LED constant current power supply.

* integrated 650V power MOSFET

* PSR constant current control without secondary feedback circuitry

* without transformer auxiliary winding detection and power supply

* LED open-circuit voltage can be adjusted by external resistor

DESCRIPTION
The LTC®3783 is a current mode LED driver and boost, flyback and SEPIC controller that drives both an N-channel power MOSFET and an N-channel load PWM switch. When using an external load switch, the PWMIN input not only drives PWMOUT, but also enables controller GATE switching and error amplifier operation, allowing the controller to store load current information while PWMIN is low. This feature (patent pending) provides extremely fast, true PWM load switching with no transient overvoltage or undervoltage issues; LED dimming ratios of 3000:1 can be achieved digitally, avoiding the color shift normally associated with LED current dimming. The FBP pin allows analog dimming of load current, further increasing the effective dimming ratio by 100:1 over PWM alone.
In applications where output load current must be returned to VIN, optional constant current/constant voltage regulation controls either output (or input) current or output voltage and provides a limit for the other. ILIM provides a 10:1 analog dimming ratio.
For low- to medium-power applications, No RSENSE mode can utilize the power MOSFET’s on-resistance to eliminate the current-sense resistor, thereby maximizing efficiency.
The IC’s operating frequency can be set with an external resistor over a 20kHz to 1MHz range and can be synchronized to an external clock using the SYNC pin.
The LTC3783 is available in the 16-lead DFN and TSSOP packages.

FEATURES
■ True Color PWMTM Delivers constant Color with 3000:1 Dimming Ratio
■ Fully Integrated Load FET driver for PWM Dimming Control of High Power LEDs
■ 100:1 Dimming from Analog Inputs
■ Wide FB Voltage Range: 0V to 1.23V
■ constant current or constant Voltage Regulation
■ Low Shutdown current: IQ = 20µA
■ 1% 1.23V Internal Voltage Reference
■ 2% RUN Pin Threshold with 100mV Hysteresis
■ Programmable Operating Frequency (20kHz to 1MHz) with One External Resistor
■ Synchronizable to an External Clock Up to 1.3fOSC
■ Internal 7V Low Dropout Voltage Regulator
■ Programmable Output Overvoltage Protection
■ Programmable Soft-Start
■ Can be Used in a No RSENSETM Mode for VDS < 36V
■ 16-Lead DFN and TSSOP Packages

APPLICATIONS
■ High Voltage LED Arrays
■ Telecom Power Supplies
■ 42V Automotive Systems
■ 24V Industrial Controls
■ IP Phone Power Supplies