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PDF MC33370T Data sheet ( Hoja de datos )
| Número de pieza | MC33370T | |
| Descripción | (MC33369 - MC33374) High Voltage Off Line Power Switching Regulator | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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High Voltage Power
Switching Regulator
The MC33369 through MC33374 are monolithic high voltage power
switching regulators that combine the required converter functions with a unique
programmable state controller, allowing a simple and economical powersystem
solution for office automation, consumer, and industrial products. These devices
are designed to operate directly from a rectified AC line source, and in flyback
converter applications are capable of providing an output power in excess of
150 W with a fixed AC input of 100 V, 115 V, or 230 V, and in excess of 90 W
with a variable AC input that ranges from 85 V to 265 V.
This device series features a programmable state controller, an on–chip
700 V SENSEFET™ power switch circuit, 700 V active off–line startup circuit
including a high voltage JFET and a low voltage MOSFET, auto restart logic,
fixed frequency duty cycle controlled oscillator, current limiting comparator
with leading edge blanking, latching pulse width modulator for double pulse
suppression, and a high gain amplifier with a bandgap reference. Protective
features include cycle–by–cycle current limiting, input undervoltage lockout
with hysteresis, and a non–latching thermal shutdown. These devices are
available in economical 8–pin dual–in–line and five pin TO–220 style
packages.
• Programmable State Controller
• On–Chip 700 V SENSEFET Power Switch Circuit
• Rectified AC Line Source Operation from 85 V to 265 V
• On–Chip 700 V Active Off–Line Start–Up Circuit
• Latching PWM for Double Pulse Suppression
• Cycle–By–Cycle Current Limiting
• Input Undervoltage Lockout with Hysteresis
• Non–Latching Internal Thermal Shutdown
• Enhanced Functionality Over TOP200 and TOP221 Series
Typical Application
AC
Input
Feedback
+
Snubber
Aux
Power
Supply
+
Power
5 Switch Pin
+
+ DC
Output
–
VCC Startup Circuit
1
State Control
Input
Feedback
Input
2
Programmable
State Controller
Pulse Width Modulator
Controller
Power
Switch
Circuit
4
On/Off
+ Ground 3
This device contains 391 active transistors.
Order this document by MC33370/D
MC33369
thru
MC33374
HIGH VOLTAGE
OFF–LINE POWER
SWITCHING REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 626
Pin 1. VCC
2. Feedback Input
3. Ground
4. State Control Input
8
1
5. Power Switch Pin
6. Ground
7. Ground
8. Ground
T SUFFIX
PLASTIC PACKAGE
CASE 314D
1
5
TV SUFFIX
PLASTIC PACKAGE
CASE 314E
1
5
Pin 1. VCC
2. Feedback Input
3. Ground
4. State Control Input
5. Power Switch Pin
Heatsink surface connected to Pin 3
ORDERING INFORMATION
Device
MC33369P
MC33370P
MC33371P
MC33372P
MC33373AP
MC33369T
MC33370T
MC33371T
MC33372T
MC33373T
MC33374T
MC33369TV
MC33370TV
MC33371TV
MC33372TV
MC33373TV
MC33374TV
Power Switch Circuit
On Peak
Resistance Current
(W) (A)
12 0.5
12 0.9
6.8 1.5
4.8 2.0
4.0 2.5
12 0.5
12 0.9
6.8 1.5
4.8 2.0
3.8 2.7
3.0 3.3
12 0.5
12 0.9
6.8 1.5
4.8 2.0
3.8 2.7
3.0 3.3
Package
Plastic
DIP–8
Straight
Lead
Vertical
Mount
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1999
Rev 3
1
1 page  
MC33369 thru MC33374
Figure 1. Oscillator Frequency Change
versus Temperature
120
www.DataSheet4U.com
110
Ifb = 4.0 mA
Figure 2. State Control Input Current
versus Input Voltage
3.0
Ifb = 4.0 mA
TA = 25°C
2.0
Input
Zener
Clamp
100 1.0
90
80
–50 –25
0 25 50 75 100 125 150
TC, CASE TEMPERATURE (°C)
0
–1.0
0
Input Open
Circuit Voltage
2.0
4.0
Input PNP
Transistor Clamp
6.0 8.0
Vin, STATE CONTROL INPUT VOLTAGE (V)
10
Figure 3. State Control Input Threshold
Voltage versus Temperature
4.6
Set Comparator Threshold, Vin Increasing Ifb = 4.0 mA
4.4
4.2
2.3
2.1 Toggle Comparator Hysteresis, Vin Increasing
1.9 Toggle Comparator Threshold, Vin Decreasing
1.7
–50 –25
0 25 50 75 100 125 150
TC, CASE TEMPERATURE (°C)
Figure 4. State Control Input Open Circuit
and Clamp Voltages versus Temperature
11
Input Zener Clamp Voltage at 10 mA
9.0
5.7 Input PNP Clamp Voltage at 0.5 mA
5.3
3.6 Input Open Circuit Voltage
Ifb = 4.0 mA
3.5
–50 –25 0 25 50 75 100 125 150
TC, CASE TEMPERATURE (°C)
Figure 5. Power Switch Circuit Output Duty Cycle
versus Feedback Input Current
80
Threshold of Duty Cycle Reduction
60
Pin 1 Connected to Pin 2
TA = 25°C
40
MC33369/
MC33370
MC33374
20
Power Supply Current
After UVLO Turn–On
0
0 2.0 4.0 6.0 8.0 10
IFB, FEEDBACK INPUT CURRENT (mA)
Figure 6. Feedback Input Current
versus Input Voltage
100
Pin 1 Connected to Pin 2
TA = 25°C
80
60
40
Input
Resistance
DVFB
DIFB
20
0
0 2.0 4.0 6.0 8.0 10
VFB, FEEDBACK INPUT VOLTAGE (V)
12
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page 
MC33369 thru MC33374
Start–Up Circuit
Contained within the MC33369 thru MC33374 is a
Start–Up circuit that is governed by the State Control block.
The Start–Up circuit includes a high voltage JFET and a low
wvwowlta.DgaetaMShOeeStF4UE.Tc.omThe drain of the high voltage JFET is
connected to Pin 5. The gate of the JFET is grounded. The
source of the high voltage JFET is connected to the drain of
the low voltage MOSFET. The JFET pinches off and clamps
the voltage on the drain of the MOSFET to a low voltage
between 18–24 volts. A resistance of 550K ohms is
connected between the drain and gate of the low voltage
MOSFET. The low voltage on the drain and gate of the
MOSFET simplifies construction of the Start–Up circuit. This
circuitry yields an increase in converter efficiency by the
elimination of an external startup resistor and its associated
power dissipation that is common in most of the off–line
converters that utilize a UC3842 type of controller.
Rectified AC line voltage is applied to the Start–Up circuit
from Pin 5. This enables the Start–Up circuit to provide
charge current to the VCC bypass capacitor that connects
from Pin 1 to ground. When VCC reaches the UVLO upper
threshold of 8.5 V, the Start–Up circuit is turned off to
complete the startup phase. The IC then commences normal
operation. As the converter output approaches regulation,
the auxiliary transformer winding begins to provide operating
bias. All of the required device power is now efficiently
converted down directly from the rectified AC line. The
Start–Up circuit will provide an initial charging current of 2.0
mA when powered from 400 V. This current will decrease as
the VCC pin voltage rises or if the device is powered from a
lower input voltage, refer to Figures 9 and 10. The Start–Up
circuit is rated at a maximum of 700 V with the VCC pin
shorted to ground.
Undervoltage Lockout
An Undervoltage Lockout comparator is included to
guarantee that the integrated circuit has sufficient voltage to
be fully functional before the output stage is enabled. The
UVLO comparator monitors the feedback input voltage at
Pin 2 and when it exceeds the startup threshold of 8.5 V, the
Start–Up circuit turns off, the Internal Bias block is switched
on, and the Power Switch circuit is enabled. To prevent
erratic switching as the threshold is crossed, 1.0 V of
hysteresis is provided. This level of hysteresis ensures that
there is sufficient energy stored in the VCC bypass capacitor
to power the bias circuitry until auxiliary power supply takes
over. If the converter output is nominally loaded, regulation
will be established and the opto–isolator will provide sufficient
current into the feedback input to keep the VCC bypass
capacitor charged. Figure 20 shows the timing waveforms
during startup and normal operation.
If the converter output is overloaded or shorted, the device
will enter into the auto restart mode. This happens when the
opto–isolator is not able to provide sufficient current into the
feedback input to keep the VCC bypass capacitor charged.
When the capacitor voltage falls below the minimum
operating threshold of 7.5 V, the UVLO comparator switches
the Internal Bias block off, and disables the Power Switch
circuit. The Start–Up circuit is turned on and the VCC bypass
capacitor begins charging. When the UVLO startup threshold
is reached, the Start–Up circuit again turns off, the Internal
Bias block is switched on, and the Divide by 8 counter is
clocked. Since the Power Switch circuit is now disabled by
the Divide by 8 counter, the opto–isolator will not provide
current to the VCC bypass capacitor, the capacitor will
discharge. The UVLO comparator and Start–Up circuit will
regulate the capacitor voltage in a hysteretic mode, varying
between 7.5 V to 8.5 V, with an effective ramp–up duty cycle
of approximately 35%. The Divide by 8 counter will enable
the Power Switch circuit to burst at the 100 kHz Oscillator
frequency on every eighth ramp–down cycle. The device will
remain in the auto restart mode until the output overload or
short is removed and the threshold of regulation can again be
reached. The purpose of the Divide by 8 counter is to reduce
the Power Switch circuit and output rectifier power
dissipation when the converter is subjected to an output
overload or short. The counter effectively limits the average
switching duty cycle to approximately 5%. Figure 21 shows
the timing waveforms when in auto restart mode.
Thermal Shutdown and Package
The internal Thermal Shutdown block protects the device
in the event that the maximum junction temperature is
exceeded. When activated, typically at 157°C, one input of
the Driver is held low to disable the Power Switch circuit.
When disabled, the UVLO comparator and Start–Up circuit
regulate the VCC pin voltage in the hysteretic mode. Thermal
shutdown activation is non–latching and the Power Switch
circuit is allowed to resume operation when the junction
temperature falls below 140°C. The thermal shutdown
feature is provided to prevent catastrophic device failures
from accidental overheating. It is not intended to be used as
a substitute for proper heatsinking.
The die in the 8–pin dual–in–line package is mounted on a
special heat tab copper alloy lead frame. The tab consists of
pins 3, 6, 7, 8 is specifically designed to improve the thermal
conduction from the die to the printed circuit board. This
permits the use of standard layout and mounting practices
while having the ability to halve the junction to air thermal
resistance.
The die in the 5 pin TO–220 style package is mounted
directly on a copper alloy heat tab. This metal tab is exposed
on the back side of the package for heatsink attachment and
is electrically common to the device ground, Pin 3. A wide
variety of TO–220 style heatsinks are commercially available
for enhancing the thermal performance and converter output
power capability.
State Control
The State Control block is designed to interface with a
small number of external components to implement various
methods of converter on/off control. By utilizing the distinctive
features of the State Control Input, this device series can be
programmed to enter into either the standby* or operating
mode in response to an appropriate input stimulus. This
stimulus can come from a user interface pushbutton switch,
an optically coupled microcontroller output signal, a
combination of both, or other circuit configurations. The State
Control Logic can be disabled and made to appear
transparent when converter on/off control is not required.
Figures 22 and 23 respectively show the State Control
operating table, and the Control Block along with seven input
examples.
The State Control block consists of a resistor bias
network, Toggle and Set Comparators for threshold
detection, an Input Clamp to provide drive for an opto light
emitting diode, control logic elements for storing the
operating state, and a Reset MOSFET for discharging an
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MC33370T.PDF ] | |
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