FEATURES
◆ Built-in 700V Power BJT
◆ Proprietary NC-Cap/PSR-IITM Control:
● ±4% CC and CV Precision
● Proprietary “Audio Noise Cancellation”
Control
● Built-in “Fast Dynamic Response” Control to
Meet USB Charge Requirements
● Proprietary “Zero-Output Startup” Control
● Proprietary “Smart Output Short Protection”
● without External Compensation/Filtering
Capacitor Needed
● Max. 50V Output for AC/DC LED Lighting
◆ Direct Drive of Low Cost BJT
◆ Proprietary Cable Drop Compensation
◆ Multi Mode Control
◆ Wide VDD Operating Range
◆ 11.7V UVLO Hysteresis Window
◆ Cycle-by-Cycle Current Limiting
◆ Leading Edge Blanking (LEB)
◆ Built-in Soft Start, Pin Floating Protection
◆ VDD UVLO, OVP & Clamp
APPLICATIONS
◆ Battery chargers
◆ Replaces linear transformer and RCC SMPS
◆ Small power adapter
◆ AC/DC LED lighting
GENERAL DESCRIPTION
SF6021 is a high precision, highly integrated DCM
(Discontinuous Conduction Mode) Primary Side
Regulation (PSR) power switch for offline small
power converter applications. It has built-in power
BJT, which can further lower system cost.
SF6021 has built-in proprietary NC-Cap/PSR-IITM
control for CV control, which eliminates external
compensation or filtering capacitor. It has built-in
cable drop compensation function, which can provide
excellent CV performance. The IC uses Multi Mode
Control to improve efficiency and reliability and to
decrease audio noise energy @ light loadings.
SF6021 integrates proprietary “Audio Noise
Cancellation” control for audio noise free operation.
The IC has built-in “Fast Dynamic Response”
control to meet USB Charge requirements. SF6021
also integrates proprietary “Zero-Output Startup”
control to achieve startup when output is near zero
voltage. The IC has proprietary “Smart Output Short
Protection”, which can protect the system with large
leakage inductance when output is short circuit.
SF6021 integrates functions and protections of FB
Short Protection, Under Voltage Lockout (UVLO),
VDD Over Voltage Protection (VDD OVP), Soft Start,
Cycle-by-cycle Current Limiting (OCP), Pin Floating
Protection, VDD Clamping.
SF6021 is available SOP7 packages.
TYPICAL APPLICATION
AC IN
SF6021
1 VDD
2 FB
GND 7
3 NC
4 CS
C6
C5
DC
Out
Pin Configuration
©SiFirst Technology
- 1 - Confidential
SiFirst_DS_6021_V1.0
