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EM8931 Datasheet

PWM Controller

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EM8931 pdf
Cost Effective PWM Forward Controller
EM8931
General Description
EM8931 is a high performance, low startup
current, low cost, current mode PWM controller.
The EM8931 integrates functions of Soft Start(SS),
Under Voltage Lockout(UVLO), Leading Edge
Blanking(LEB), internal Over Temperature
Protection(OTP), internal slope compensation. The
EM8931 also features more protection like Over
Load Protection(OLP) and Over Voltage
Protection(OVP) to prevent circuit damage
occurred under abnormal conditions.
The EM8931 provides the users a superior
AC/DC power application of high efficiency,
excellent EMI performance, low external
component counts and lower cost solution.
Ordering Information
Part Number
EM8931J
Package
SOT-23-6
EM8931S
DIP-8
Remark
Features
Ultra Low Start Up Current (6uA)
Current Mode Control
Soft Start Function
Built-in Slope Compensation
Internal Leading-edge Blanking
UVLO
Over Voltage Protection (OVP) on VDD pin
Over Load Protection (OLP)
Cycle-by-cycle Current Limit
Feedback Open Protection
Internal Over Temperature Protection (OTP)
Constant Output Power Limit (Full AC Input
Range)
Excellent EMI performance
Applications
Switching AC/DC Adaptor and charger
Open-Frame SMPS
Typical Application Circuit
AC EMI
INPUT Filter
DC
+
OUTPUT
VDD
RT GATE
EM8931
COMP
CS
GD
2012/4/13
Rev.A.1
1
Excelliance MOS
Excelliance MOS



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