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零件编号 | MP020-5 | ||
描述 | Primary-Side Regulator | ||
制造商 | MPS | ||
LOGO | |||
1 Page
The Future of Analog IC Technology
DESCRIPTION
The MP020-5 is an offline, primary-side
regulator that provides accurate constant
voltage and constant current regulation without
an opto-coupler or a secondary feedback circuit.
It has an integrated 700V MOSFET.
The MP020-5's variable off-time control allows
a flyback converter to operate in discontinuous
conduction mode. The MP020-5 also features
protection functions such as VCC under-voltage
lockout, over-current protection, over-
temperature protection, open circuit protection
(OCkP) and over-voltage protection. Its internal
high-voltage start-up current source and power-
saving technologies limit the no-load power
consumption to less than 30mW.
The MP020-5's variable-switching-frequency
technology provides natural spectrum shaping
to smooth the EMI signature, making it suitable
for offline, low-power battery chargers and
adapters.
The MP020-5 is available in SOIC8-7A.
Part Num.
MP020-5GS
RON
10Ω
Maximum Output
Power (85-265Vac)
Adapter
Open
Frame
5W 8W
TYPICAL APPLICATION
MP020-5
Offline, Primary-Side Regulator
with CC/CV Control and a 700V FET
FEATURES
• Primary-Side–Control without Opto-Coupler
or Secondary Feedback Circuit
• Precise Constant Current and Constant
Voltage Control (CC/CV)
• Integrated 700V MOSFET with Minimal
External Components
• Variable, Off-Time, Peak-Current Control
• 550µA High-Voltage Current Source
• 30mW No-Load Power Consumption
• Programmable Cable Compensation
• Multiple Protections: OVP, OCP, OCkP,
OTP, and VCC UVLO
• Natural Spectrum Shaping for Improved
EMI Signature
• Low Cost and Simple External circuit
• SOIC8-7A Package
APPLICATIONS
• Cell Phone Chargers
• Adapters for Handheld Electronics
• Stand-By and Auxiliary Power Supplies
• Small Appliances
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology”, are Registered Trademarks
of Monolithic Power Systems, Inc.
MP020-5 Rev. 1.05
www.MonolithicPower.com
1/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
MP020-5 – OFFLINE, PRIMARY-SIDE REGULATOR WITH CC/CV CONTROL AND A 700V FET
PIN FUNCTIONS
SOIC8-7A
Pin #
Name
Description
Supply. IC begins functioning when VCC charges to VCCH through an internal high-voltage
1 VCC current source. When VCC falls below VCCL, the internal high-voltage current source turns on
to charge VCC. Connect 0.1µF decoupling ceramic capacitor for most applications.
3
FB
Feedback. Provides the output reference voltage and detects falling voltage edges to
determine the operation mode (CV mode and CC mode).
4
CP
Output Cable Compensation. Connect a 1μF ceramic capacitor as a low pass filter. The
upper resistor of resistor divider connected to FB adjusts the compensation voltage.
2, 5, 6 GND Ground.
8 Drain Internal MOSFET Drain. Input for the high-voltage start-up current source.
MP020-5 Rev. 1.05
www.MonolithicPower.com
1/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
8
MP020-5 – OFFLINE, PRIMARY-SIDE REGULATOR WITH CC/CV CONTROL AND A 700V FET
EMI (Output GND connect to earth) without Y
cap. The Y cap will bring about the leakage
current which is prohibited in some cell phone
charger application. Figure 15 could illustrate
how the Common Noise of the secondary side
diode be restrained. The secondary side
winding split to two separate windings NSEC1
and NSEC2 which have same turns and
approximate parasitic capacitor CSP1,and CSP2
but their ‘hot spot’ is opposite as the Point 9
and Point 10 in Figure 15, so the common
mode noise current produced at secondary side
windings can be counteracted each other.
The transformer structure could be simple if the
application does not need to pass the 3 wire
Conducted EMI or could use the Y cap. Figure
16 shows the schematic with the simple
transformer structure.
MP020-5 Rev. 1.05
www.MonolithicPower.com
1/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
16
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页数 | 20 页 | ||
下载 | [ MP020-5.PDF 数据手册 ] |
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