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KP321XB series
KP321XB High-performance, low-cost offline PWM control power switch The KP321XB series is a high-performance, low-cost PWM control power switch suitable for offline low-power buck applications. It features a simple external circuit and a small number of components. The built-in high-voltage MOSFET also improves the system's surge tolerance. Unlike traditional PWM controllers, the KP321XB does not have a fixed clock to drive the MOSFET. The system switching frequency adjusts automatically with the load. The chip also uses multi-mode PWM control technology, which effectively simplifies external circuit design, improves line regulation and load regulation, and eliminates audible noise during system operation. In addition, the internal peak current detection threshold automatically adjusts according to the actual load, effectively reducing standby power consumption under no-load conditions. The KP321XB integrates comprehensive protection functions with self-recovery capabilities: VDD undervoltage protection, cycle-by-cycle current limiting, output overvoltage protection, overtemperature protection, overload protection, and VDD overvoltage protection.
Category：
- Product Description
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- Commodity name: KP321XB series
- 封装: SOP-8 and DIP-8
- 品牌: Biyi Microelectronics
KP321XB High-performance, low-cost offline PWM control power switch The KP321XB series is a high-performance, low-cost PWM control power switch suitable for offline low-power buck applications. It features a simple external circuit and a small number of components. The built-in high-voltage MOSFET also improves the system's surge tolerance. Unlike traditional PWM controllers, the KP321XB does not have a fixed clock to drive the MOSFET. The system switching frequency adjusts automatically with the load. The chip also uses multi-mode PWM control technology, which effectively simplifies external circuit design, improves line regulation and load regulation, and eliminates audible noise during system operation. In addition, the internal peak current detection threshold automatically adjusts according to the actual load, effectively reducing standby power consumption under no-load conditions. The KP321XB integrates comprehensive protection functions with self-recovery capabilities: VDD undervoltage protection, cycle-by-cycle current limiting, output overvoltage protection, overtemperature protection, overload protection, and VDD overvoltage protection.
Main Features
• Integrated 650V high-voltage MOSFET and high-voltage startup circuit
• Optimized light-load noise, improved system anti-interference capability
• Multi-mode control, noiseless operation
• Supports buck and buck-boost topologies
• Default 12V output (FB pin open)
• Standby power consumption <50mW
• Good line regulation and load regulation
• Integrated soft-start circuit
• Built-in protection functions:
• Overload protection (OLP)
• Cycle-by-cycle current limit (OCP)
• Output overvoltage protection (OVP)
• VDD overvoltage, undervoltage, and voltage clamping protection
• Package type SOP-8 and DIP-8
Product Model Topology Maximum Output Operating Mode Output Withstand Voltage (V) On-Resistance (Ω) Startup Standby Power Consumption VDDmax Maximum Frequency Package Current (mA) Characteristics Method (mW) (V) (kHz) KP321AB Buck/Buck-Boost 250 DCM&CCM CV 650V MOS 15 High Voltage Startup <50 30 60 SOP-8 KP3210B Buck/Buck-Boost 400 DCM&CCM CV 650V MOS 9.5 High Voltage Startup <50 30 60 SOP-8 KP3210B Buck/Buck-Boost 400 DCM&CCM CV 650V MOS 9.5 High Voltage Startup <50 30 60 DIP-8 KP3211B Buck/Buck-Boost 600 DCM&CCM CV 650V MOS 4 High Voltage Startup <50 30 60 SOP-8 KP3211B Buck/Buck-Boost 600 DCM&CCM CV 650V MOS 4 High Voltage Startup <50 30 60 DIP-8 KP3212B Buck/Buck-Boost 800 DCM&CCM CV 650V MOS 2.1 High Voltage Startup <50 30 60 DIP-8
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