MC33364
Critical Conduction
GreenLinet SMPS
Controller
The MC33364 series are variable frequency SMPS controllers that
operate in the critical conduction mode. They are optimized for high
density power supplies requiring minimum board area, reduced
component count, and low power dissipation. Integration of the high
voltage startup saves approximately 0.7 W of power compared to the
value of the resistor bootstrapped circuits.
Each MC33364 features an on-
-board reference, UVLO function, a
watchdog timer to initiate output switching, a zero current detector to
ensure critical conduction operation, a current sensing comparator,
leading edge blanking, a CMOS driver and cycle- -cycle current
-by-
limiting.
The MC33364D1 has an internal 126 kHz frequency clamp. The
MC33364D2 is available without an internal frequency clamp. The
MC33364D has an internal 126 kHz frequency clamp which is pinned
out, so that the designer can adjust the clamp frequency by connecting
appropriate values of resistance.
Features
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MARKING
DIAGRAMS
8
8
1
SO-
-8
D1, D2 SUFFIX
CASE 751
1
M64Dx
ALYW
G
16
16
1
x
A
WL
Y
W, WW
G or
G
=
=
=
=
=
=
SO-
-16
D SUFFIX
CASE 751K
1
1 or 2
Assembly Location
Wafer Lot
Year
Work Week
Pb--Free Package
MC33364D
AWLYWWG
Lossless Off-
-Line Startup
Leading Edge Blanking for Noise Immunity
Watchdog Timer to Initiate Switching
Operating Temperature Range -
-25C to +125C
Shutdown Capability
Over Temperature Protection
Optional/Adjustable Frequency Clamp to Limit EMI
This is a Pb-
-Free and Halide-
-Free Device
PIN CONNECTIONS
MC33364D1
MC33364D2
ORDERING INFORMATION
Device
MC33364D1G
MC33364D1R2G
MC33364D2G
MC33364D2R2G
MC33364DG
MC33364DR2G
SO--16
(Pb--Free)
SO--8
(Pb--Free)
Package
Shipping
†
96 Units / Rail
2500 Units / Tape & Reel
96 Units / Rail
2500 Units / Tape & Reel
48 Units / Rail
2500 Units / Tape & Reel
Zero Current
N/C
Current Sense
Voltage FB
N/C
V
ref
N/C
Freq Clamp
Zero Current
Current Sense
Voltage FB
V
ref
1
2
3
4
(Top View)
8 Line
7 V
CC
6 Gate Drive
5 GND
MC33364D
1
2
3
4
5
6
7
8
(Top View)
13 N/C
12 V
cc
11 Gate Drive
10 P GND
9 A GND
16 Line
†For information on tape and reel specifications, including part orientation
and tape sizes, please refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Semiconductor Components Industries, LLC, 2010
November, 2010 - Rev. 18
-
1
Publication Order Number:
MC33364/D
MC33364
Vref
Vref regulator
turn on
UVLO
+
--
Vcc
Startup
Vref
turn on
UVLO
+
--
15V/ 7.6V
UVLO
Thermal
Shutdown
45k
FB
15k
Watchdog
Timer
Vcc
R
CS
FC
LEB
0.1V
Frequency Clamp
--
+
R
S
Q
Level
SNA
Gate
P Gnd
A Gnd
+
--
Reset
15V/ var
Vcc
Line
15V/ 8.1V
ZCD
Vref
10V
--
+
1.2V/ 1.0V
5k
Figure 1. Representative Block Diagram
Input
AC Voltage
Output
Voltage
MC33364D
ZCD
Line
CS
FB
Rsense
Vref
FC
R1
Vcc
Drive
P Gnd
A Gnd
R2
Figure 2. Typical Application Circuit
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2
MC33364
Startup circuit is
charging the VCC
capacitor
15V
Supply Voltage, VCC
Startup circuit turns
off when VCC is 15V
8.1V
VT (3.5 to 6V)
5V
Startup circuit turns
on when VCC reaches
the threshold VT
Reference Voltage, Vref
0V
Vref regulator turns on
when VCC reaches 15V
Vref falls faster than VCC
since Vref capacitor is much
smaller than VCC capacitor
Maximum drain current is
limited to 1.15V / Rsense
Vref regulator turns
off when VCC falls
below 8.1 V
Drain Current
0A
Switching starts when
Vref reaches 5V
Switching stops when
Vref falls below 3.7V
Figure 3. Timing Diagram in Fault Condition
Criticial Mode
Output
Current
Maximum drain current is limited to 1.15V/ Rsense
Drain
Current
LEB
Discontinous Conduction Mode
No load
toff(min)
Secondary
Side Diode
Current
Drain
Voltage
Vin
10V
Voltage
at ZCD
0.7V
ZCD is ignored during minimum off--time limit
Figure 4. Timing Diagram in Normal Condition
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3
MC33364
PIN DESCRIPTION
Pin
1 (1)
Function
Zero Current Detect
Description
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.
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.
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 V
ref
Pin via a 5 k resistor
providing bias for the external optocoupler.
The V
ref
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/(T
ON
+ T
OFFmin
).
This pin is the ground for the internal circuitry excluding the gate drive stage.
This pin is the ground for the gate drive stage.
The gate drive is the output to drive the gate of the power MOSFET.
Provides the voltage for all internal circuitry including the gate drive stage and V
ref
. This pin has
Undervoltage Lockout with hysteresis.
The Line Pin provides the initial power to the V
CC
pins. Internally the line pin is a high voltage
current source, eliminating the need for an external startup network.
3 (2)
Current Sense
4 (3)
Voltage Feedback
6 (4)
8 (NA)
V
ref
Frequency Clamp
9 (5)
10 (5)
11 (6)
12 (7)
16 (8)
NOTE:
A GND
P GND
Gate Drive
V
CC
Line
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
(T
A
= 25C, unless otherwise noted.)
Rating
Power Supply Voltage (Operating)
Line Voltage
Current Sense, Compensation,
Voltage Feedback, Restart Delay and Zero Current Input Voltage
Zero Current Detect Input
Restart Diode Current
Power Dissipation and Thermal Characteristics
D1 and D2 Suffix, Plastic Package Case 751
Maximum Power Dissipation @ T
A
= 70C
Thermal Resistance, Junction--to--Air
D Suffix, Plastic Package Case 751B--05
Maximum Power Dissipation @ T
A
= 70C
Thermal Resistance, Junction--to--Air
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature Range
P
D
R
θJA
T
J
T
A
T
stg
550
145
150
--25 to +125
--55 to +150
mW
C/W
C
C
C
P
D
R
θJA
450
178
mW
C/W
Symbol
V
CC
V
Line
V
in1
I
in
I
in
Value
16
700
--1.0 to +10
5.0
5.0
Unit
V
V
V
mA
mA
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.
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4
MC33364
ELECTRICAL CHARACTERISTICS
(V
CC
= 15.5 V, for typical values T
A
= 25C, for min/max values T
J
= --25 to 125C)
Characteristic
VOLTAGE REFERENCE
Reference Output Voltage (I
Out
= 0 mA, T
J
= 25C)
Line Regulation (V
CC
= 10 V to 20 V)
Load Regulation (I
Out
= 0 mA to 5.0 mA)
Maximum V
ref
Output Current
Reference Undervoltage Lockout Threshold
ZERO CURRENT DETECTOR
Input Threshold Voltage (V
in
Decreasing)
Hysteresis (V
in
Decreasing)
Input Clamp Voltage -- High State (I
DET
= 3.0 mA)
Input Clamp Voltage
-- Low State (I
DET
= --3.0 mA)
CURRENT SENSE COMPARATOR
Input Bias Current (V
CS
= 0 to 2.0 V)
Built In Offset
Feedback Pin Input Range
Feedback Pin to Output Delay
DRIVE OUTPUT
Source Resistance (Drive = 0 V, V
Gate
= V
CC
-- 1.0 V)
Sink Resistance (Drive = V
CC
, V
Gate
= 1.0 V)
Output Voltage Rise Time (25% -- 75%) (C
L
= 1.0 nF)
Output Voltage Fall Time (75% -- 25%) (C
L
= 1.0 nF)
Output Voltage in Undervoltage (V
CC
= 7.0 V, I
Sink
= 1.0 mA)
LEADING EDGE BLANKING
Delay to Current Sense Comparator Input
(V
FB
= 2.0 V, V
CS
= 0 V to 4.0 V step, C
L
= 1.0 nF)
THERMAL SHUTDOWN
Shutdown (Junction Temperature Increasing)
Hysteresis (Junction Temperature Decreasing)
TIMER
Watchdog Timer
UNDERVOLTAGE LOCKOUT
Startup Threshold (V
CC
Increasing)
Minimum Operating Voltage After Turn--On (V
CC
Decreasing)
FREQUENCY CLAMP
Internal FC Function (pin open)
Internal FC Function (pin grounded)
Frequency Clamp Input Threshold
Frequency Clamp Control Current Range (Sink)
Dead Time (FC pin = 1.7 V)
TOTAL DEVICE
Line Startup Current (V
Line
= 50 V) (V
CC
= V
th(on)
-- 1.0 V)
Restart Delay Time
Line Pin Leakage (V
Line
= 500 V)
Line Startup Current (V
CC
= 0 V, V
Line
= 50 V)
V
CC
Dynamic Operating Current (50 kHz, C
L
= 1.0 nF)
V
CC
Off State Consumption (V
CC
= 11 V)
I
Line
t
DLY
I
Line
I
Line
I
CC
I
CC Off
5.0
0.5
6.0
1.5
300
8.5
100
32
10
2.75
544
12
70
12
4.5
800
mA
ms
mA
mA
mA
mA
f
max
f
max
V
th(FC)
I
Control
T
d
104
400
1.89
30
3.5
126
564
1.95
70
5.0
145
800
2.01
110
6.5
kHz
kHz
V
mA
ms
V
th(on)
V
Shutdown
14
6.5
15
7.6
16
8.5
V
V
t
DLY
200
360
700
ms
T
sd
T
H
--
--
180
50
--
--
C
t
PHL(in/out)
--
250
--
ns
R
OH
R
OL
t
r
t
f
V
O(UV)
10
5
--
--
--
36
11
67
28
0.01
70
25
150
50
0.03
Ω
Ω
ns
ns
V
I
IB
V
IO
V
FB
t
DLY
--0.5
50
1.1
100
0.02
108
1.24
232
0.5
170
1.4
400
mA
mV
V
ns
V
th
V
H
V
IH
V
IL
0.9
--
9.0
--1.1
1.0
200
10.33
--0.75
1.1
--
12
0.5
V
mV
V
V
ref
Reg
line
Reg
load
I
O
V
th
4.90
--
--
--
--
5.05
2.0
0.3
5
4.5
5.20
50
50
--
--
V
mV
mV
mA
V
Symbol
Min
Typ
Max
Unit
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