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PDF ME8200 Data sheet ( Hoja de datos )
| Número de pieza | ME8200 | |
| Descripción | Current Mode PWM Controller | |
| Fabricantes | Microne | |
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ME8200
Current Mode PWM Controller With Frequency Shuffling ME8200
General Description
ME8200 is a highly integrated current mode PWM
control IC optimized for high performance, low
standby power and cost effective offline flyback
converter applications in sub 30W range. 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 ME8200. 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(CS) 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. ME8200 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 to maximum 18V to
protect the power MOSFET. 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. ME8200 is offered in
SOT23-6 package.
Features
Frequency Shuffling Technology for Improved EMI
Performance.
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 and Low Operating Current
(1.4mA)
Leading Edge Blanking on Current Sense Input
Good Protection Coverage With Auto Self-Recovery
VDD Over Voltage Clamp and Under Voltage Lockout
with Hysteresis (UVLO)
Gate Output Maximum Voltage Clamp (20V)
Line Input Compensated Cycle-by-Cycle Over-current
Threshold Setting For Constant Output Power Limiting
Over Universal Input Voltage Range.
Overload Protection (OLP)
Typical Application
Offline AC/DC flyback converter for
Battery Charger
Power Adaptor
Set-Top Box Power Supplies
Open-frame SMPS
Pin Configuration
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1 page  
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
ME8200
Gate Drive Output
VOL
VOH
V_Clamp
T_r
Output Low Level
Output High Level
Output Clamp Voltage Level
Output Rising Time
T_f Output Falling Time
Frequency Shuffling
∆f_OSC
Frequency
Modulation
range /Base frequency
f_shuffling
Shuffling Frequency
VDD = 16V, Io = -20 mA
VDD = 16V, Io = 20 mA
VDD = 16V, CL = 1nf
VDD = 16V, CL = 1nf
RI=100K
RI=100K
0.8
10
18
220
70
V
V
V
nS
nS
-3
64
3
%
HZ
Operation Description
The ME8200 is a highly integrated PWM controller IC
optimized for offline flyback converter applications in
sub 30W power range. The extended burst mode
control greatly reduces the standby power
consumption and helps the design easily meet the
international power conservation requirements.
Startup Current and Start up Control
Startup current of ME8200 is designed to be very low
so that VDD could be charged up above UVLO
threshold level and device starts up quickly. A large
value startup resistor can therefore be used to
minimize the power loss yet provides reliable startup in
application. For AC/DC adaptor with universal input
range design, a 2 MΩ, 1/8 W startup resistor could be
used together with a VDD capacitor to provide a fast
startup and low power dissipation solution.
Operating Current
The Operating current of ME8200 is low at 1.4mA.
Good efficiency is achieved with ME8200 low operating
current together with extended burst mode control
features.
Frequency shuffling for EMI improvement
The frequency Shuffling/jittering (switching frequency
modulation) is implemented in ME8200. The oscillation
frequency is modulated with a random source so that
the tone energy is spread out. The spread spectrum
minimizes the conduction band EMI and therefore
reduces system design challenge.
Extended Burst Mode Operation
At zero load or light load condition, majority of the
power dissipation in a switching mode power supply is
from switching loss on the MOSFET transistor, the core
loss of the transformer and the loss on the snubber
circuit. The magnitude of power loss is in proportion to
the number of switching events within a fixed period of
time. Reducing switching events leads to the reduction
on the power loss and thus conserves the energy.
ME8200 self adjusts the switching mode according to
the loading condition. At from no load to light/medium
load condition, the FB input drops below burst mode
threshold level. Device enters Burst Mode control.
The Gate drive output switches only when VDD voltage
drops below a preset level and FB input is active to
output an on state. Otherwise the gate drive remains at
off state to minimize the switching loss and reduces the
standby power consumption to the greatest extend.
The frequency control also eliminates the audio noise
at any loading conditions.
Oscillator Operation
A resistor connected between RI and GND sets the
constant current source to charge/discharge the
internal cap and thus the PWM oscillator frequency is
determined. The relationship between RI and switching
frequency follows the below equation within the
specified RI in Kohm range at nominal loading
operational condition.
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5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ME8200.PDF ] | |
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