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ME8202 Datasheet Preview

ME8202 Datasheet

Current Mode PWM Controller

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Email:lxh@szsemi.com13509685286
ME8202
Current Mode PWM Controller With Frequency Shuffling ME8202
General Description
ME8202 is a highly integrated current mode PWM
control IC optimized for high performance, low
standby power and cost effective offline flyback
converter applications. PWM switching frequency at
normal operation is externally programmable and
trimmed to tight range. At no load or light load
condition, the IC operates in extended ‘burst mode’
to minimize switching loss. Lower standby power and
higher conversion efficiency is thus achieved.VDD
low startup current and low operating current
contribute to a reliable power on startup design with
ME8202. A large value resistor could thus be used in
the startup circuit to minimize the standby power. The
internal slope compensation improves system large
signal stability and reduces the possible
subharmonic oscillation at high PWM duty cycle
output. Leading-edge blanking on current sense
input removes the signal glitch due to snubber circuit
diode reverse recovery and thus greatly reduces the
external component count and system cost in the
design. ME8202 offers complete protection coverage
with automatic self-recovery feature including
Cycle-by-Cycle current limiting (OCP), over load
protection (OLP), VDD over voltage clamp and under
voltage lockout (UVLO). The Gate-drive output is
clamped at 16V to protect the power MOSFET. In
ME8202,OCP threshold slope is internally optimized
to reach constant output power limit over universal
AC input range. Excellent EMI performance is
achieved with frequency shuffling technique together
with soft switching control at the totem pole gate
drive output. Tone energy at below 20KHZ is
minimized in the design and audio noise is eliminated
during operation.
Features
Extended Burst Mode Control For Improved Efficiency and
Minimum Standby Power Design
Audio Noise Free Operation
External Programmable PWM Switching Frequency
Internal Synchronized Slope Compensation
Low VDD Startup Current (3μA) and Low Operating Current
(1.8mA)
External programmable over temperature protection (OTP)
With or without On-chip VDD OVP for system OVP
Under Voltage Lockout with Hysteresis (UVLO)
Gate Output Maximum Voltage Clamp (16V)
Line Input Compensated Cycle-by-Cycle Over-current
Threshold Setting For Constant Output current Limiting Over
Universal Input Voltage Range(OCP).
Over load Protection (OLP)
Available in SOP8 and DIP8 package
Typical Application
Offline AC/DC flyback converter for
Battery Charger
PC/TV/Set-Top Box Power Supplies
Laptop Power Adaptor
Open-frame SMPS
SelectionGuide
V1.0
www.szsemi.com.
Page 1 of 12




Microne

ME8202 Datasheet Preview

ME8202 Datasheet

Current Mode PWM Controller

No Preview Available !

Pin Configuration
The ME8202 is offered in SOP8 and DIP8 packages shown as below.
ME8202
SOP8
DIP8
PIN Assignments
Pin Num.
1
2
3
4
5
6
7
8
Symbol
Description
GND Ground
Feedback input pin. The PWM duty cycle is determined by voltage level into this pin
FB
and current-sense signal level at PIN6.
Connected through a large value resistor to rectified line input for startup IC supply
VIN
and line voltage sensing.
Internal Oscillator frequency setting pin. A resistor connected between RI and GND
RI
sets the PWM frequency.
RT Temperature sensing input pin. Connected through a NTC resistor to GND.
SENSE Current sense input pin. Connected to MOSFET current sensing resistor node.
VDD Chip DC power supply pin.
GATE Totem-pole gate drive output for the power MOSFET.
Absolute Maximum Ratings
Parameter
VDD/VIN DC Supply Voltage
VDD Zener Clamp VoltageNote
VDD DC Clamp Continuous Current
VFB ,VSENSE ,VRI,VRT (Voltage at FB,SENSE,RI,RT to GND)
Min/Max Operating Junction Temperature TJ
Min/Max Storage Temperature Tstg
RθJA thermal Resistance
Range
30
VDD_Clamp+0.1V
10
-0.3 to 7
-20 to 125
-55 to 150
SOP8
150
DIP8
90
Unit
V
V
mA
V
°C
°C
°C/W
V1.0
www.szsemi.com.
Page 2 of 12


Part Number ME8202
Description Current Mode PWM Controller
Maker Microne
Total Page 12 Pages
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