MC33364(2010) Ver la hoja de datos (PDF) - ON Semiconductor
Número de pieza
componentes Descripción
Fabricante
MC33364 Datasheet PDF : 16 Pages
| |||
MC33364
PIN DESCRIPTION
Pin
Function
Description
1 (1)
Zero Current Detect
The ZCD Pin ensures critical conduction mode. ZCD monitors the voltage on the auxiliary winding,
during the demagnetization phase of the transformer, comparing it to an internal reference. The
ZCD sets the latch for the output driver.
3 (2)
Current Sense
The Current Sense Pin monitors the current in the power switch by measuring the voltage across
a resistor. Leading Edge Blanking is utilized to prevent false triggering. The voltage is compared to
a resistor divider connected to the Voltage Feedback Pin. A 110 mV voltage off--set is applied to
compensate the natural optocoupler saturation voltage.
4 (3)
Voltage Feedback
The Voltage Feedback Pin is typically connected to the collector of the optocoupler for feedback
from the isolated secondary output. The Feedback is connected to the Vref Pin via a 5 k resistor
providing bias for the external optocoupler.
6 (4)
8 (NA)
9 (5)
Vref
Frequency Clamp
A GND
The Vref Pin is a buffered internal 5.0 V reference with Undervoltage Lockout.
The Frequency Clamp Pin ensures a minimum off--time value, typically 6.9 ms. It prevents the
MOSFET from restarting within a fixed (33364D1) or adjustable (33364D) delay. The minimum
off--time is disabled in the 33364D2. Therefore the maximum switching frequency cannot exceed
1/(TON + TOFFmin).
This pin is the ground for the internal circuitry excluding the gate drive stage.
10 (5)
P GND
This pin is the ground for the gate drive stage.
11 (6)
Gate Drive
The gate drive is the output to drive the gate of the power MOSFET.
12 (7)
VCC
Provides the voltage for all internal circuitry including the gate drive stage and Vref. This pin has
Undervoltage Lockout with hysteresis.
16 (8)
Line
The Line Pin provides the initial power to the VCC pins. Internally the line pin is a high voltage
current source, eliminating the need for an external startup network.
NOTE: For further information please refer to the following Application Notes;
AN1594: Critical Conduction Mode, Flyback Switching Power Supply Using the MC33364.
AN1681: How to keep a Flyback Switch--Mode Power Supply Stable with a Critical--Mode Controller.
MAXIMUM RATINGS (TA = 25C, unless otherwise noted.)
Rating
Symbol
Value
Unit
Power Supply Voltage (Operating)
Line Voltage
Current Sense, Compensation,
Voltage Feedback, Restart Delay and Zero Current Input Voltage
VCC
VLine
Vin1
16
V
700
V
--1.0 to +10
V
Zero Current Detect Input
Restart Diode Current
Power Dissipation and Thermal Characteristics
Iin
5.0
mA
Iin
5.0
mA
D1 and D2 Suffix, Plastic Package Case 751
Maximum Power Dissipation @ TA = 70C
Thermal Resistance, Junction--to--Air
D Suffix, Plastic Package Case 751B--05
PD
RθJA
450
mW
178
C/W
Maximum Power Dissipation @ TA = 70C
PD
550
mW
Thermal Resistance, Junction--to--Air
RθJA
145
C/W
Operating Junction Temperature
TJ
150
C
Operating Ambient Temperature
TA
--25 to +125
C
Storage Temperature Range
Tstg
--55 to +150
C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
NOTE: ESD data available upon request.
http://onsemi.com
4
Share Link: 