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PDF MAP8802 Data sheet ( Hoja de datos )
| Número de pieza | MAP8802 | |
| Descripción | CRM PFC Controller | |
| Fabricantes | MagnaChip | |
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Datasheet Version 1.3
MAP8802
CRM PFC Controller
General Description
Features
The MAP8802 is an active power factor correction
(PFC) controller for boost PFC applications that operates
in critical conduction mode (CRM)
In CRM operation, the on time is constant during the ac
line cycle and the off time varies with the instantaneous
input voltage.
The voltage mode CRM PFC controller does not need the
input voltage sense line. It can reduce power loss. CRM
operation is an ideal choice for medium power
(100W~300W) PFC boost stages with the zero current
switching of DCM operation.
MAP8802 provides protection functions such as
overvoltage protection, under-voltage protection, open
feedback loop protection, overcurrent protection, PFC
output/bypass diode short protection, ZCD winding short
protection.
MAP8802 is a available in an SOP-8 Pin package. The
device operates over the -40°C ~ 125°C temperature.
ranges.
Applications
AC Adapter
Ballast, Solid State Lighting
LCD TV, Monitor
PDP TV
SMPS
Near Unity Power Factor
No Input Voltage Sensing Requirement
Latching PWM for Cycle-by-Cycle on time
Control (Voltage Mode)
Trans-conductance Amplifier
High Precision Voltage Reference
(±1.6% Over the temperature range)
Very low startup current consumption (≤35uA)
Low typical operating current consumption
Source 500mA / Sink 800mA Totem pole gate
driver
Under-voltage lockout with hysteresis
Pin-to-Pin compatible with industry standards
This is a Pb-Free and Halide-Free Device
ZCD Short protection
Protection function
Boost diode short Protection
Bypass diode short Protection.
ZCD winding short Protection
Overvoltage Protection
Overcurrent Protection
Undervoltage Protection
Open/Floating feedback Protection
Ordering Information
Part Number
MAP8802
Top
Marking
MAP8802
Ambient
Temperature Range
-40°C~125°C
Package
8-Lead Small Outline Package (SOP-8 Pin)
Pb-Free
YES
AUG, 2015
MagnaChip Confidential Document. Do not distribute.
1 page  
Datasheet Version 1.3
Electrical Characteristics
Unless noted, VCC = 13V, and typical values are tested at TA = 25°C
Symbol
Characteristic
STARTUP AND SUPPLY CIRCUITS
VCC(ON)
VCC(OFF)
HUVLO
ICC(Startup)
ICC1
Startup Voltage Threshold
Minimum Operating Voltage
Supply Voltage Hysteresis
Startup Current Consumption
No Load Switching
Current Consumption
ICC2 Switching Current Consumption
ICC(fault)
Fault Condition
Current Consumption
ERROR AMPLIFIER SECTION
VREF
△VREF1
△VREF2
Voltage Reference
Voltage Reference Line Regulation
Temperature Stability of VREF (4)
IEA
(SINK/SOURCE)
IEA(SINK)OVP
Error Amplifier Current Capability
Gm Trans conductance
RFB
IFB
ICONTROL
VEAH
Feedback Pin Internal Pull Down
Resistor
Feedback Bias Current
Control Bias Current
Maximum Control Voltage
Ct(offset)
Minimum Control Voltage to
Generate output Pulses
VEA(DIFF)
Control Voltage Range
CURRENT SENSE SECTION
VILIM
tLEB
tCS
Current Sense Voltage Threshold
Leading Edge Blanking Duration
Overcurrent Detection Propagation
Delay
ICS Current Sense Bias Current
Conditions
VCC Increasing
VCC Decreasing
0V < VCC < VCC(ON) -200mV
COUT = open, 70kHz Switching,
VCS = 0V
COUT = 1nF, 70kHz Switching,
VCS = 0V
No Switching, VFB = 0V
TA = 25°C
VCC(ON) + 200mV < VCC < 20V
VFB = VREF ±0.1V
VFB = 1.08 * VREF or VREF + 0.2V
VFB = VREF ±0.1V
VFB > VREF + 0.2V, VFB < VREF - 0.2V
VFB = V UVP to V REF
VFB = 2.5V
VFB = 0V
ICONTROL(PULL UP) = 10uA,
VFB > VREF (VFB = VREF + 0.1V)
VCONTROL = Decreasing until
VOUT is low, VCT = 0V
VEAH – Ct(offset)
VCS = 0V, VOUT = 90% to 10%
dV/dt = 10V/us
VCS = VILIM to VOUT = 10%
VCS = 2V
Min
11
8.8
-
-
-
-
-
2.475
-10
-1.6
6
20
105
-
2
0.25
-1
5
0.37
4.5
0.45
100
40
-1
Typ
12
9.5
2.5
24
1.4
2.4
1.2
2.500
-
-
10
50
125
250
4.6
0.54
-
5.5
0.65
4.9
0.5
190
100
-
Max. Unit
13 V
10.2 V
-V
35 µA
1.7 mA
2.9 mA
1.45 mA
2.525
10
1.6
V
mV
%
20
80 uA
145 µmho
-
10 MΩ
1.25 µA
1 µA
6V
0.88 V
5.3 V
0.55 V
350 ns
170 ns
1 µA
AUG, 2015
MagnaChip Confidential Document. Do not distribute.
5 Page 
Datasheet Version 1.3
VOUT
FB
1
Control
3
E/A
Gm
VREF
VCONTROL
Compensation
Network
Figure 21. Compensation Network
For the transconductance error amplifier side, gain changes
based on differential input. When the error is large, gain is
large to make the output dip or peak to suppress quickly.
When the error is small, low gain is used to improve power
factor performance.
IControl
250umho
FB : 2.5V
2.4V
gm : 125umho
2.6V
FB
250umho
6. Overshoot-less” Startup
Feedback control speed of PFC is quite slow. Due to the
slow response, there is a gap between output voltage and
feedback control. That is why over-voltage protection
(OVP) is critical at the PFC controller and voltage dip
caused by fast load changes from light to heavy is
diminished by a bulk capacitor. OVP is easily triggered at
startup phase. Operation on and off by OVP at startup
may cause audible noise and can increase voltage stress
at startup, which is normally higher than in normal
operation. This operation is better when startup time is
very long. However, too long startup time enlarges the
output voltage building time at light load. MAP8802 has
“overshoot-less” control at startup. During startup, the
feedback loop is controlled by an internal proportional gain
controller and when the output voltage reaches the rated
value, it switches to an external compensator after a
transition time. In short, an internal proportional gain
controller eliminates overshoot at startup and an external
conventional compensator takes over successfully
afterward.
7. CS Block
The MOSFET current is sensed using an external
sensing resistor for over-current protection. If the CS pin
voltage is higher than 0.5V, the over-current protection
comparator generates a protection signal. If the boost
diode is shorted, the very high current flows through the
MOSFET and then the MOSFET is damaged. MAP8802
has a comparator to generate a protection signal if the CS
pin voltage is higher than 1.6V. At this time, DRV signal to
be off and that is not start operation before VCC is up to
UVLO voltage. And to more stable operation of DSP, we
are recommend that connect to bid at MOSFET drain
current path.
OCP
CS 4
VILIM
Figure 22. Gain Change
VDSP
5. Error Amplifier Block
The error amplifier block consists of a OVP comparator, a
transconductance amplifier and a UVP comparator. This
enables the FB pin to be used for sensing overvoltage or
under voltage conditions independently of the error
amplifier. The MAP8802 regulates the boost output
voltage using an internal error amplifier (E/A). The
negative terminal of the EA is pinned out to FB, the
positive terminal is connected to a 2.5V±1.6% reference,
and the EA output is pinned out to Control. A feature of
using a transconductance type amplifier is that the FB pin
voltage is only determined by the resistor divider network
connected to the output voltage, not the operation of the
amplifier. (See Figure21)
Figure 23. Diode Short Protection
AUG, 2015
MagnaChip Confidential Document. Do not distribute.
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAP8802.PDF ] | |
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