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PDF HFC0300 Data sheet ( Hoja de datos )
| Número de pieza | HFC0300 | |
| Descripción | Variable Off Time Controller | |
| Fabricantes | MPS | |
| Logotipo |  |
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HFC0300
The Future of Analog IC Technology
DESCRIPTION
HFC0300 is a variable off-time co ntroller that
uses a f ixed-peak–current technique to
decrease its frequency as the load lightens. As
a result, it offers excellent efficiency at light-load
while optimizing the efficiency under other load
conditions.
When the f requency decreases to threshold ,
the peak current decreases with the decreasing
load to prevent mechanical reson ance in the
transformer. The controller enters burst mode
when the output power falls below a given level.
The HFC0300 features various protections such
as thermal shutdown, VCC under-voltage lockout,
overload protection, short-circuit protection, and
over-voltage protection.
The HFC0300 is available in SOIC-7 package.
Variable Off Time Controller
FEATURES
Variable Off-Time, Current Mode Control
Universal Main Supply Operation (85VAC to
265VAC)
Frequency Foldback as Load Lightens
Peak-Current Compression to Reduce
Transformer Noise
Active-Burst Mode for Low Standby Power
Consumption
Internal High-Voltage Current Source
Internal 200ns Leading Edge Blanking
Thermal Shutdown (Auto Restart with
Hysteresis)
VCC Under-Voltage Lockout with Hysteresis
Over-Voltage Protection on VCC Pin
Timer-Based Overload Protection
Short-Circuit Protection
Natural Spectrum Shaping for Improved
EMI Performance
APPLICATIONS
Battery Charger for Portable Electronics
Standby Power Supply
Switched-Mode Power Supplies
For MPS green status, please vis it MP S we bsite un der Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
HFC0300 Rev. 1.0
www.MonolithicPower.com
9/23/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1
http://www.Datasheet4U.com
1 page  
HFC0300– VARIABLE OFF TIME CONTROLLER
ELECTRICAL CHARACTERISTICS (continued)
VCC=12V, TA=25°C, unless otherwise noted.
Parameter
Symbol Conditions Min Typ Max Unit
Driving Signal (Pin DRV)
Sourcing Resistor
Sinking Resistor
VDRIVE Clamp
RH
RL
VDRIVE Vcc=18V
10
3
13.7
Ω
Ω
V
PIN FUNCTIONS
SOIC-7
Pin #
1
2
3
4 COMP
5
6 VCC
8
Name Des cription
DRV
CS
GND
FSET
HV
Drive. Output of the drive signal.
Current Sense Input.
Ground.
Switching Freque ncy Set. A feedback volt age of 0.85V will trigge r overl oad
protection, and a feedback voltage of 3.1V will trigger a burst mode operation.
Frequency Set. Maximum switching frequency set by a capacitor.
IC Supply. Conne cted to an external bulk capacitor. If an auxiliary windin g brings
this pin above 24V, the controller latches off.
High-Voltage Source. Input for the start-up high voltage current source.
HFC0300 Rev. 1.0
www.MonolithicPower.com
9/23/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved
5
5 Page 
HFC0300– VARIABLE OFF TIME CONTROLLER
Shut Down
Internal High Voltage
Current Source
Start
Internal High Voltage
Current Source ON
Y Vcc>11.7V N
Y
Soft Start
Y
Vcc<8.2V
Vcc Decrease
to 5.5V
Shut off the
Switching
Pulse
Y
OTP or
N
SCP
Logic
N
High?
Monitor Vcc
OTP or SCP
Monitor
Y
Vcc<3V?
N
Latch off the
Switching Pulse
Y
VCC>24V N
VCOMP>3.2V
Switch Off
Monitor VCOMP
0.85V<VCOMP<3.1V
Off Time Operation
VCOMP<0.85V
OLP=Logic High
Y T>TOLP Y
and
OLP=Logic
High
N
Continuous
Fault Monitor
N VCOMP<3.1V
Y
UVLO, OTP, SCP & OLP is auto restart,
OVP is latch
Release from the latch condition, need to
unplug from the main input.
Figure 7: Control Flow Chart
HFC0300 Rev. 1.0
www.MonolithicPower.com
9/23/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet HFC0300.PDF ] | |
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