Datasheet PWM Control Type DC/DC Converter IC for AC/DC Driver BD7673AG General Description Key Specifications BD7673AG is a PWM controller typed DC/DC Power Supply Voltage range: 8.5V to 25.0V converter for AC/DC that provides an optimum system Operating Current: Normal: 0.60mA (Typ) for all products that requires an electrical outlet. This Burst: 0.40mA (Typ) product supports both isolated and non-isolated devices. Oscillation Frequency: 65kHz (Typ) IC enables simple design of low-power converters. With Operating Temperature range: -40C to +85C switching MOSFET and current detection resistor as external devices, it enables more freedom in design. Package W(Typ) x D (Typ) x H (Max) Since the peak current control is utilized, peak current SSOP6 2.90mm x 2.80mm x1.25mm is controlled in each cycle, application excels wide bandwidth and transient response. BD7673AG includes various protective functions such as soft start function, burst function, per-cycle over current limiter, VCC overvoltage protection and overload protection. An external latch pin (COMP pin) is provided, so that latch stopping (OFF) can be set by external signals. This function is available as overheating protection and over output voltage protection. The PWM switching frequency is fixed at 65 kHz. A frequency hopping function is included which contributes to low EMI. Features PWM frequency of 65kHz PWM current mode method Low circuit current when UVLO is ON Applications (12A at VCC=12V) AC adapters and household appliances (vacuum cleaners, Low circuit current in no load (Burst operation when load is light) humidifiers, air cleaners, air conditioners, refrigerators, IH cooking heaters, rice cookers, etc.) Built-in SW frequency hopping function 250nsec leading-edge blanking VCC UVLO / OVP Per-cycle over current protection circuit Soft start Output overload protection (latch protection) External latch function for COMP pin (Over heating protection function) Typical Application Circuit F2 D4 F1 C2 R2 D1 FL1 R1 + C5 C9 ZNR1 C8 D2 + C1 D3 R4 Q1 + C3 ZD R5 R6 C7 7673 7673A R9 U1 R7 C6 R8 C4 R3 R11 U2 R10 Figure 1, Application Diagram (12 V 1A Isolated Type) Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays . www.rohm.com TSZ02201-0F2F0A200120-1-2 2013 ROHM Co., Ltd. All rights reserved. 1/18 TSZ2211114001 22.Mar.2017 Rev.003DatasheetDatasheet BD7673AG Pin ConfigurationSSOP6 (Unit:mm) Figure 2, External Dimensions of SSOP6 Package Pin Description Table 1 I/O PIN Functions ESD protection system NO. Pin Name I/O Function VCC GND 1 GND I/O GND pin - 2 FB I Feedback signal input pin 3 COMP I Comparator input pin 4 CS I Primary current sensor pin 5 VCC I Power supply input pin - 6 OUT O External MOS drive pin I/O Equivalent Circuit Figure 3, I/O Equivalent Circuit www.rohm.com TSZ02201-0F2F0A200120-1-2 2013 ROHM Co., Ltd. All rights reserved. 2/18 TSZ2211115001 22.Mar.2017 Rev.003