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PDF MD1800 Data sheet ( Hoja de datos )
| Número de pieza | MD1800 | |
| Descripción | High performance primary side regulator (PSR) offline switch power supply (SMPS) controller | |
| Fabricantes | MIX-DESIGN | |
| Logotipo |  |
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MD1800/01 Datasheet
High performance primary side regulator (PSR) offline switch
power supply (SMPS) controller
PRODUCT DESCRIPTION
MD180X is high performance primary sensing regulator (PSR) and monolithic switch power controller which is designed for
small-power supply equipment with current mode control. Built-in accurate CV/CC control circuit, eliminates optocoupler, TL431
and its related loop devices. High integration design, a high performance power BJT and PFM controller and all kinds of
protection circuits in one chip, to minimize the peripheral components to save the cost greatly.
MD180X can be simply designed a typical flyback switch converter, the unique driving technology promotes the characteristics
of withstand voltage and achieves excellent converting efficiency.
FEATURES
◆ Built-in 700V@MD1800; 810V@MD1801 power BJT.
◆ PSR control, eliminates optocoupler and TL431
◆ Accurate CV/CC control
◆ Hysteresis over-temperature protection (OTP) circuit
◆ Higher efficiency and meet Level 6 efficiency standards
◆ Output voltage protection (OVP/UVP)
◆ < 100 mW no-load consumption
◆ Auto-Restart function
◆ Ultra-low start-up current
◆ Good EMC characteristic allows the simple EMC circuit
APPLICATIONS
◆ Intelligent mobile phone/small size tablet computer
◆ Digital cameras and other small digital products
◆ Power adapters for network products etc.
◆ RCC solutions Replace.
S Packge(SOIC-7 )
Figure1Packgediagram
Output Power Table
90Vac-265Vac
P/N Package
Adapter
OpenFrame
MD1800 S 4W
5W
MD1801 S 5W
5.5W
Notes:
1. Continuous maximum output power is tested in typical non-ventilated closed adapter
measured at environment temperature + 40 ℃.
2. The biggest actual continuous output power is tested in the condition of that peripheral
circuit is designed properly and enough space for heat dissipation.
◆ Package: S: SOP - 7; P: DIP-8
APPLICATION DIAGRAM
MD1800/01
ProductDatasheet
©MIX-DESIGNSemiconductorLtd@2013
Page1
Output CC/CV VI Characteristic
MIX-PD-155787
1 page  
MD1800/01 Datasheet
Highperformanceprimarysideregulator(PSR)offlineswitch
powersupply(SMPS)controller
FUNCTION DESCRIPTION
MD180X is specially designed for the charger/adapter of
small power digital products. To use PSR control technology
to provide accurate (CV/CC) characteristics. The controller
works in PFM mode and the switching frequency can be
automaticially adjusted as per the load. Optimized driving
circuit greatly promotes withstand voltage of the power BJT
and minimizes the switching loss, so as to make the circuit
have excellent converting efficiency.
CONSTANT VOLTAGE(CV) OPERATION
When the circuit is operates in CV area, FB will detect the
output voltage when the power BJT turn-off through the
sensing voltage by auxiliary winding of the transformer, to
make the output voltage stablized in the fixed value. In the
turn-on period of the output rectifier diode D,it's given the
output winding voltage and auxiliary winding voltage as
follows:
When Toffs, the primary coil stores the energy, the output
filter capacitor makes load discharge. In CC operation area,
MD180X switch frequency will follow the output load direct
ratio control detected by FB Voltage.
Figure 5. Secondary Current Wavaform
The secondary rectifier diode peak current is determinated
by the peak current of primary-side inductance which also
affects the output current. The corresponding relation
between the primary peak current and the secondary peak
current is as follows.
Vaux : auxiliary winding voltage；Nb：subsidiary winding turns；NS:
output winding turns； Vd：forward voltage drop of output rectifier diode
FB will test the auxiliary winding voltage while the power BJT
off-time to regulate the output voltage. In order to avoid the
peak influence happens in power BJT turn-off resulting from
the leakage inductance of the transformer, and considering
the accuracy of sampling voltage, FB captures the auxiliary
winding detection sampling points as below:
Ipk: primary peak current ; NP: primary winding turns; NS: secondary
winding turns; Ipks:secondary peak current
And primary inductance peak current is determinated by Pin
4 to RCS resistance, the primary inductance peak current
and RCS resistance are in inverse proportion, so only need
to adjust CS resistance to achieve different output currents.
Output current Iout and primary current are given by:
Figure 4.Auxiliary Voltage Wavaform
CONSTANT CURRENT(CC ) OPETATION
MD180X CC control circuit is requested the converter
oprating in DCM . In CC operation mode , the CC control
circuit will fix the proportion between the Tons and Toffs
produced by diode rectifier D. When Tons time, the primary
energy of the transformer will be converted to the secondary
winding, via the rectifier diode then charge the output
capacitor and supply load simultaneously.
Iout: Output current; Tons: secondary rectifier diode on-time;
Toffs: secondary rectifier diode off-time
OUTPUT CABLE COMPENSATION
MD180X built-in output cable drop compensation circuit.
When it outputs different loads, the cable drop compensa-
tion circuit provides cable drop voltage compensation which
is in fixed proportion with output voltage. The internal circuit
will generate one cable drop compensation signal once have
one 100nF capacitor connected with external Pin CPC.
PROTECTIVE FUNCTIONS
In order to guarantee a safe and reliable circuit to all occas-
ions, MD180X built-in rich protection circuits, such as OCP
,OVP, FB open-loop protection etc as intergration. Once
abnormality, it will come into protection mode.
ProductDatasheet
©MIX-DESIGNSemiconductorLtd@2013
Page5
MIX-PD-155787
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MD1800.PDF ] | |
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