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44608P75 데이터시트, 핀배열, 회로
MC44608
Few External Components
Reliable and Flexible
SMPS Controller
The MC44608 is a high performance voltage mode controller
designed for off--line converters. This high voltage circuit that
integrates the startup current source and the oscillator capacitor,
requires few external components while offering a high flexibility and
reliability.
The device also features a very high efficiency standby management
consisting of an effective Pulsed Mode operation. This technique
enables the reduction of the standby power consumption to
approximately 1.0 W while delivering 300 mW in a 150 W SMPS.
General Features
Integrated Startup Current Source
Lossless Off--Line Startup
Direct Off--Line Operation
Fast Startup
Flexibility
Duty Cycle Control
Undervoltage Lockout with Hysteresis
On Chip Oscillator Switching Frequency 40 or 75
Secondary Control with Few External Components
These are Pb--Free Devices*
Protections
Maximum Duty Cycle Limitation
Cycle by Cycle Current Limitation
Demagnetization (Zero Current Detection) Protection
“Over VCC Protection” Against Open Loop
Programmable Low Inertia Over Voltage Protection
Against Open Loop
Internal Thermal Protection
SMPS Controller
Pulsed Mode Techniques for a Very High Efficiency
Low Power Mode
Lossless Startup
Low dV/dT for Low EMI Radiations
*For additional information on our Pb--Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
http://onsemi.com
8
1
PDIP--8
P SUFFIX
CASE 626
MARKING DIAGRAM
8
MC44608Pxx
AWL
YYWWG
1
MC44608Pxx
A
WL
YY
WW
G
= Device Code
xx = 40 or 75
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb--Free Package
PIN CONNECTIONS
Demag 1
Isense 2
Control Input 3
GND 4
8 Vi
7
6 VCC
5 Driver
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
Semiconductor Components Industries, LLC, 2010
December, 2010 -- Rev. 10
1
Publication Order Number:
MC44608/D




44608P75 pdf, 반도체, 판매, 대치품
MC44608
ELECTRICAL CHARACTERISTICS (VCC = 12 V, for typical values TA = 25C, for min/max values TA = --25C to +85C unless
otherwise noted) (Note 2)
Characteristic
Symbol
Min Typ Max Unit
DEMAGNETIZATION DETECTION section (note 3)
Demag Comparator Threshold (Vpin1 increasing)
Demag Comparator Hysteresis (Note 4)
Propagation Delay (Input to Output, Low to High)
Input Bias Current (Vdemag = 50 mV)
Negative Clamp Level (Idemag = --1.0 mA)
Positive Clamp Level @ Idemag = 125 mA
Positive Clamp Level @ Idemag = 25 mA
OVERTEMPERATURE section
Trip Level Over Temperature
Hysteresis
STANDBY MAXIMUM CURRENT REDUCTION section
Normal Mode Recovery Demag Pin Current Threshold
K FACTORS SECTION FOR PULSED MODE OPERATION
ICCS / Istup
MC44608P40
ICCS / Istup
MC44608P75
ICCL / Istup
(Vstup -- UVLO2) / (Vstup -- UVLO1)
(UVLO1 -- UVLO2) / (Vstup -- UVLO1)
ICS / Vcsth
Demag ratio Iovp / Idem NM
(V3 1.0 mA -- V3 0.5 mA) / (1.0 mA -- 0.5 mA)
Vcontrol Latchoff
SUPPLY SECTION
Minimum Startup Voltage
VCC Startup Voltage
Output Disabling VCC Voltage After Turn On
Hysteresis (Vstup--th -- Vuvlo1)
VCC Undervoltage Lockout Voltage
Hysteresis (Vuvlo1 -- Vuvlo2)
Absolute Normal Condition VCC Start Current @ (Vi = 100 V) and
(VCC = 9.0 V)
Switching Phase Supply Current (no load)
MC44608P40
MC44608P75
Vdmg--th
Hdmg
tPHL(In/Out)
Idem--lb
Vcl--neg--dem
Vcl--pos--dem--H
Vcl--pos--dem--L
Thigh
Thyst
Idem--NM
10 x K1
10 x K1
103 x K2
102 x Ksstup
102 x Ksl
106 x Ycstby
Dmgr
R3
V3
30
--
--
--0.6
--0.9
2.05
1.4
--
--
20
2.4
2.8
46
1.8
90
175
3.0
--
--
Vilow
Vstup--th
Vuvlo1
Hstup--uvlo1
Vuvlo2
Huvlo1--uvlo2
--(ICC)
ICCS
--
12.5
9.5
--
6.2
--
7.0
2.0
2.4
50
30
300
--
--0.7
2.3
1.7
160
30
25
2.9
3.3
52
2.2
120
198
4.7
1800
4.8
--
13.1
10
3.1
6.6
3.4
9.5
2.6
3.2
69 mV
-- mV
-- ns
-- mA
--0.4 V
2.8 V
1.9 V
-- C
-- C
30 mA
3.8 --
4.2 --
63 --
2.6 --
150 --
225 --
5.5 --
-- Ω
-- V
50
13.8
10.5
--
7.0
--
12.8
3.6
4.0
V
V
V
V
V
V
mA
mA
Latched Off Phase Supply Current
ICC--latch
0.3 0.5 0.68 mA
Hiccup Mode Duty Cycle (no load)
δHiccup
-- 10 -- %
2. Adjust VCC above the startup threshold before setting to 12 V. Low duty cycle pulse techniques are used during test to maintain junction
temperature as close to ambient as possible.
3. This function can be inhibited by connecting pin 1 to GND.
4. Guaranteed by design (non tested).
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44608P75 전자부품, 판매, 대치품
MC44608
OSC
4V
Vcont
2.4 V
Clock
VCC 13 V
10 V
6.5 V
DMG
Iprim
Figure 6.
The OSC and Clock signals are provided according to the
Figure 6. The Clock signals correspond to the CT capacitor
discharge. The bottom curve represents the current flowing
in the sense resistor Rcs. It starts from zero and stops when
the sawtooth value is equal to the control voltage Vcont. In
this way the SMPS is regulated with a voltage mode control.
Overvoltage Protection
The MC44608 offers two OVP functions:
-- a fixed function that detects when VCC is higher than
15.4 V
-- a programmable function that uses the demag pin. The
current flowing into the demag pin is mirrored and
compared to the reference current Iovp (120 mA). Thus this
OVP is quicker as it is not impacted by the VCC inertia and
is called QOVP.
In both cases, once an OVP condition is detected, the
output is latched off until a new circuit startup.
Startup Management
The Vi pin 8 is directly connected to the HV DC rail Vin.
This high voltage current source is internally connected to
the VCC pin and thus is used to charge the VCC capacitor. The
VCC capacitor charge period corresponds to the startup
phase. When the VCC voltage reaches 13 V, the high voltage
9.0 mA current source is disabled and the device starts
working. The device enters into the switching phase.
It is to be noticed that the maximum rating of the Vi pin 8
is 500 V. ESD protection circuitry is not currently added to
this pin due to size limitations and technology constraints.
Protection is limited by the drain--substrate junction in
avalanche breakdown. To help increase the application
safety against high voltage spike on that pin it is possible to
insert a small wattage 1.0 kΩ series resistor between the Vin
rail and pin 8.
The Figure 7 shows the VCC voltage evolution in case of
no external current source providing current into the VCC
pin during the switching phase. This case can be
encountered in SMPS when the self supply through an
auxiliary winding is not present (strong overload on the
SMPS output for example). The Figure 17 also depicts this
working configuration.
Startup
Phase
Latched off
Phase
Figure 7. Hiccup Mode
Switching
Phase
In case of the hiccup mode, the duty cycle of the switching
phase is in the range of 10%.
Mode Transition
The LW latch Figure 8 is the memory of the working status
at the end of every switching sequence.
Two different cases must be considered for the logic at the
termination of the SWITCHING PHASE:
1. No Over Current was observed
2. An Over Current was observed
These 2 cases are corresponding to the signal labelled
NOC in case of “No Over Current” and “OC” in case of Over
Current. So the effective working status at the end of the ON
time memorized in LW corresponds to Q=1 for no over
current and Q=0 for over current.
This sequence is repeated during the Switching phase.
Several events can occur:
1. SMPS switch OFF
2. SMPS output overload
3. Transition from Normal to Pulsed Mode
4. Transition from Pulsed Mode to Normal Mode
Latched Off
Phase
VPWM
OUT
LEB out
1V
& NOC S Q
OC LW
&
SQ
Mode
Standby
&
R Q & R1
R2
+--CS
Startup Idemag Switching Startup
Phase > 24 mA Phase Phase
S1
Switch
Figure 8. Transition Logic
1. SMPS SWITCH OFF
When the mains is switched OFF, so long as the bulk
electrolithic bulk capacitor provides energy to the SMPS,
the controller remains in the switching phase. Then the peak
current reaches its maximum peak value, the switching
frequency decreases and all the secondary voltages are
reduced. The VCC voltage is also reduced. When VCC is
equal to 10 V, the SMPS stops working.
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44608P75

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