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SF5938S Datasheet Preview

SF5938S Datasheet

Power MOSFET

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FEATURES
Built-in 600V Power MOSFET
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
Proprietary Cable Drop Compensation
Multi Mode Control
Low Standby Power Under 70mW
Wide VDD Operating Range
Cycle-by-Cycle Current Limiting
Leading Edge Blanking (LEB)
Built-in Soft Start
Pin Floating Protection
VDD Under Voltage Lockout (UVLO)
VDD OVP & Clamp
APPLICATIONS
Battery chargers for cellular phones, cordless
phones, PDA, digital cameras, etc
Replaces linear transformer and RCC SMPS
Small power adapter
TYPICAL APPLICATION
AC/DC LED lighting
GENERAL DESCRIPTION
SF5938S is a high performance, highly integrated
DCM (Discontinuous Conduction Mode) Primary Side
Regulation (PSR) power switch for offline small
power converter applications. It can achieve less than
±4% CV/CC precision.
SF5938S 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. The
IC can achieve less than 70mW standby power.
SF5938S 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. SF5938S
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.
SF5938S 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.
SF5938S is available in DIP8 package.
AC IN
SF5938S
1 VDD GND 8
2 NC GND 7
3 FB
4 CS
Drain 6
Drain 5
DC
Out
Pin Configuration
©SiFirst Technology
- 1 - Confidential
SiFirst_DS_5938S_V1.0




SiFirst

SF5938S Datasheet Preview

SF5938S Datasheet

Power MOSFET

No Preview Available !

VDD
NC
FB
CS
18
DIP8
27
36
45
GND
GND
Drain
Drain
Ordering Information
Part Number
Top Mark
SF5938SDP
SF5938SDP
Package
DIP8
RoHs
Tape & Reel
Output Power Table(1)
Part Number
SF5938S
230VAC ± 15%(2)
Adapter(3)
18W
85-265VAC
Adapter(3)
13W
Note 1. The Max. output power is limited by junction temperature
Note 2. 230VAC or 100/115VAC with doublers
Note 3. Typical continuous power in a non-ventilated enclosed adapter with sufficient drain pattern as a heat
sink at 50 oC ambient.
Comparison between NC-Cap/PSR-IITM and NC-Cap/PSRTM
Function
NC-Cap/PSR-IITM
CV/CC Precision
±4%
Audio Noise Cancellation Control
Fast Dynamic Response Control
Zero Output Startup Control
Smart Output Short Protection
FB Short Protection
Maximum Output Voltage
50V
NC-Cap/PSRTM
±5%
20V
Marking Information
S F 5938S D P YWW: Year&Week code
YWW
©SiFirst Technology
- 2 - Confidential
SiFirst_DS_5938S_V1.0


Part Number SF5938S
Description Power MOSFET
Maker SiFirst
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