|
|
PDF 44608P75 Data sheet ( Hoja de datos )
| Número de pieza | 44608P75 | |
| Descripción | MC44608P75 | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de 44608P75 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
|
No Preview Available !
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
1 page  
MC44608
PIN FUNCTION DESCRIPTION
Pin Name
Description
1
Demag
The Demag pin offers 3 different functions: Zero voltage crossing detection (50 mV), 24 mA current detection
and 120 mA current detection. The 24 mA level is used to detect the secondary reconfiguration status and the
120 mA level to detect an Over Voltage status called Quick OVP.
2
Isense
The Current Sense pin senses the voltage developed on the series resistor inserted in the source of the power
MOSFET. When Isense reaches 1.0 V, the Driver output (pin 5) is disabled. This is known as the Over Current
Protection function. A 200 mA current source is flowing out of the pin 3 during the startup phase and during the
switching phase in case of the Pulsed Mode of operation. A resistor can be inserted between the sense resistor
and the pin 2, thus a programmable peak current detection can be performed during the SMPS standby mode.
3 Control Input A feedback current from the secondary side of the SMPS via the Opto--coupler is injected into this pin. A
resistor can be connected between this pin and GND to allow the programming of the Burst duty cycle during
the standby mode.
4
Ground
This pin is the ground of the primary side of the SMPS.
5
Driver
The current and slew rate capability of this pin are suited to drive Power MOSFETs.
6 VCC This pin is the positive supply of the IC. The driver output gets disabled when the voltage becomes higher than
15 V and the operating range is between 6.6 V and 13 V. An intermediate voltage level of 10 V creates a
disabling condition called Latched Off phase.
7 This pin is to provide isolation between the Vi pin 8 and the VCC pin 6.
8 Vi This pin can be directly connected to a 500 V voltage source for startup function of the IC. During the startup
phase a 9.0 mA current source is internally delivered to the VCC pin 6 allowing a rapid charge of the VCC
capacitor. As soon as the IC starts--up, this current source is disabled.
OPERATING DESCRIPTION
Regulation
V CC
V LP--stby
Control
Input
3
1
S3
0
&
Stand--by
Latched off Phase
10
S2
Vdd
Switching Phase
20 Ω
Regulation
Output
PWM
Comparator
5 V 4 kHz
Filter
1.6 V
Figure 2. Regulator
The switch S3 is closed in standby mode during the
Latched Off Phase while the switch S2 remains open. (See
section PULSED MODE DUTY CYCLE CONTROL).
The resistor Rdpulsed (Rduty cycle burst) has no effect on
the regulation process. This resistor is used to determine the
burst duty cycle described in the chapter “Pulsed Duty Cycle
Control” on page 8.
PWM Latch
The MC44608 works in voltage mode. The on--time is
controlled by the PWM comparator that compares the
oscillator sawtooth with the regulation block output (refer to
the block diagram on page 2).
The PWM latch is initialized by the oscillator and is reset
by the PWM comparator or by the current sense comparator
in case of an over current. This configuration ensures that
only a single pulse appears at the circuit output during an
oscillator cycle.
The pin 3 senses the feedback current provided by the
Opto coupler. During the switching phase the switch S2 is
closed and the shunt regulator is accessible by the pin 3. The
shunt regulator voltage is typically 5.0 V. The dynamic
resistance of the shunt regulator represented by the zener
diode is 20 Ω. The gain of the Control input is given on
Figure 11 which shows the duty cycle as a function of the
current injected into the pin 3.
A 4.0 kHz filter network is inserted between the shunt
regulator and the PWM comparator to cancel the high
frequency residual noise.
Current Sense
The inductor current is converted to a positive voltage by
inserting a ground reference sense resistor RSense in series
with the power switch.
The maximum current sense threshold is fixed at 1.0 V.
The peak current is given by the following equation:
Ipkmax
=
1
Rsense(Ω)
(A)
http://onsemi.com
5
5 Page 
MC44608
60
50
t_rise
40
t_fall
30
79.0
77.0
75.0
73.0
71.0
69.0
20
67.0
10
10 11
65.0
12 13 14 15
10
Pin6 VCC Voltage (V)
Figure 9. Output Switching Speed
--25 C
85 C
25 C
11 12 13 14
VCC Voltage (V)
Figure 10. Frequency Stability
15
90
80
70
60
50 85 C
40
30
20
10
0
0.0 0.5
--25 C
25 C
1.0 1.5
Current Injected in Pin3 (mA)
2.0
Figure 11. Duty Cycle Control
2.5
5.0
4.5
4.0 --25 C
3.5
25 C
3.0
2.5
85 C
2.0
1.5
--1.6 --1.4 --1.2 --1.0 --.08 --.06 --.04 --.02 0.0
Current Injected in Pin 3 (mA)
Figure 13. Vpin3 During the Latched Off Period
5.08
5.07
5.06
5.05
5.04
5.03
5.02
5.01
5.00
4.99
4.98
0.5
85 C
--25 C
1
25 C
1.5 2
2.5
Current Injected in Pin 3 (mA)
Figure 12. Vpin3 During the Working Period
4.80
4.60
4.40 --25 C
4.20
4.00 25 C
3.80
3.60
3.40 85 C
3.20
3.00
10
11
12 13 14 15
Pin6 VCC Voltage (V)
Figure 14. Device Consumption when Switching
http://onsemi.com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet 44608P75.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| 44608P75 | MC44608P75 | ON Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |