ROHM Semiconductor AC/DC Converter ICs
ROHM Semiconductor AC/DC Converter ICs are designed with integrated FETs and pulse width modulation (PWM) for a variety of applications. These AC/DC converter ICs provide an ideal system for products with an electrical outlet. The AC/DC converter ICs feature auto-restart capability, 650V circuit start voltage, and low switching frequencies of 65kHz and 100kHz. These ROHM converter ICs are available in the more commonly used SOP8 SMD package. Typical applications include AC adapters, industrial equipment, and household appliances.
The PWM type converter ICs support both isolated and non-isolated devices that enable the simpler design of various types of low-power electrical converters. These converter ICs consist of current detection resistors as external devices that help in achieving a higher degree of design freedom. The current is restricted in each cycle, and excellent performance is demonstrated in bandwidth and transient response as current mode control is utilized. The PWM type converter ICs reduce the switching frequency and achieve high efficiency at light load. These converter ICs consist of frequency hopping function on the chip which contributes to low electromagnetic interference (EMI).
The quasi-resonant control converter ICs enable soft switching and help to keep EMI low. These converter ICs consist of MOSFET for switching and current detection resistors as external devices to achieve a high degree of design freedom. The quasi-resonant ICs contribute to low power consumption and high-speed start because of the devices' built-in HV starter circuit. The standby power is very low because the built-in burst-mode reduces switching loss, and the IC consumption current is low.
The Quasi-resonant converter ICs now offer converters with SiC MOSFETs. These converters provide industry-leading efficiency.
Features
- PWM-type converter ICs
- PWM current mode method
- Burst operation when load is light
- Frequency reduction function
- Frequency hopping function
- Built-in 650V start circuit
- Built-in 650V switching MOSFET
- VCC pin under voltage protection
- VCC pin overvoltage protection
- SOURCE pin open protection
- SOURCE pin short protection
- SOURCE pin leading-edge-blanking function
- Per-cycle overcurrent protection circuit
- Soft start
- Secondary overcurrent protection circuit
- Quasi-resonant control converter IC
- Built-in 650V tolerate start circuit
- Low power when the load is light
- Frequency reduction function
- AC voltage correction function
- VCC pin under voltage protection
- VCC pin overvoltage protection
- Cycle-by-cycle overcurrent protection
- Soft start
- ZT trigger mask function
- ZT overvoltage function
- FB overload protection
- CS pin open protection
- Gate-clamp circuit
- Quasi-resonant converter ICs with SiC MOSFETs
- Provide low-EMI
- Minimize component failure risk
- Reduce the number of parts required
- Frequency reduction function
- 5% improvement in power efficiency
- TO220-6M package with 10mm x 4.5mm x 25.6mm dimensions
- Power factor correction + quasi-resonant control converter IC
- Quasi-resonant circuit + PFC circuit
- Built-in HV starter circuit
- 10µA low consumption current when the starter circuit is OFF
- Selectable protection method by LATCH/AUTOR terminal
- External stop function (COMP pin)
- AC input voltage stop detected function
- Built-in PFC stop terminal (PFCON/OFF)
- 15mm x 5.4mm x 1.8mm SOP24 package
- Synchronous rectification controller IC
- Ideal for active clamp /rest forward/flyback converter
- Current-mode control with dual-mode over-current protection (OCP)
- Synchronization to an external clock
- Programmable dead-time (turn-on/turn-off) between MAIN and AUX MOSFET by external resistor
- Programmable oscillator frequency and maximum duty cycle by an external resistor
- Programmable soft-start time by an external capacitor
- Programmable slope compensation by an external resistor
Applications
- AC adapters
- Household appliances
- Industrial equipment
- General-purpose inverters
- AC servos
- Programmable logic controllers (PLCs)
- Manufacturing equipment
- Robots
- Industry lighting
Specifications
- Controller types
- PWM
- QR
- PFC
- PFC +QR
- SR
- VCC OVP options
- Auto restart
- Latch
- Auto restart/latch
- 65kHz to 500kHz switching frequency range
- 15V (min) to 40V (max) VIN range
- -40°C (min) to +125°C (max) operating temperature range
- Packages
- DIP7
- DIP7K
- HS0N8
- HTSOP-J8
- SOP18
- SOP24
- SOP8
- SOP-J7S
- SOP-J8
- SSOP6
- TO220-7M
- TSSOP-B30
- TO220-6M
Additional Resources
Associated MOSFETs
ROHM Semiconductor BM2SC12xFP2-LBZ AC-DC Converters with SiC MOSFETs
Features built-in 1700V SiC MOSFET, Quasi-resonant type, and provide low EMI and soft switching.