MC33363A Datasheet, PDF (10/12 Pages) ON Semiconductor – HIGH VOLTAGE OFF-LINE SWITCHING REGULATOR

MC33363A
Figure 20. 15 W Off–Line Converter
F1
1.0 A ^D4
D3
C1
1N4006
47
92 to 276
Vac Input
D2 D1
C4 8
1.0
6
R1
13 k
C3 ₇
1200 pF
Mirror
Osc
PWM
Thermal
Startup
Reg
PWM Latch
S
Driver
Q
R
LEB
ILimit
270 µA
EA
4, 5, 12, 13
C5
4.0 nF
1
3
UVLO
14.5 V/
9.5 V ₁₁
OVP
2.6 V
16
R6
180 k
1.0 W
D5
MUR
1100E
C6
47 pF
R7
2.2 k
1.0 W
D6
D7
R5 MUR T1 MBR
39 120
1635
L1
C9 C10 5.0 µH
330 330
C2
R8
10
220
R4
5.1 k
C8
330
R9
1 2.80 k
R3
1.0 k
2
C7
100 nF
IC2
MOC
31
8103 _IC3
TL431B 2
5.05 V/3.0 A
DC Output
C11
220
C12
1.0
R10
2.74 k
5
4
9
R2
2.6 V
2.7 k
10
IC1 MC33363A
Figure 21. Converter Test Data
Test
Conditions
Results
Line Regulation Vin = 92 Vac to 276 Vac, IO 3.0 A ∆ = 1.0 mV
Load Regulation Vin = 115 Vac, IO = 0.75 A to 3.0 A ∆ = 5.0 mV
Vin = 230 Vac, IO = 0.75 A to 3.0 A ∆ = 5.0 mV
Output Ripple Vin = 115 Vac, IO = 3.0 A
Triangular = 2.0 mVpp, Spike = 32 mVpp
Vin = 230 Vac, IO = 3.0 A
Triangular = 2.0 mVpp, Spike = 34 mVpp
Efficiency
Vin = 115 Vac, IO = 3.0 A
76.8%*
Vin = 230 Vac, IO = 3.0 A
76.8%
This data was taken with the components listed below mounted on the printed circuit board shown in Figure 22.
* With MBR2535CTL, 78.8% efficiency. PCB layout modification is required to use this rectifier.
For high efficiency and small circuit board size, the Sanyo Os–Con capacitors are recommended for C8, C9, C10 and C11.
C8, C9, C10 = Sanyo Os–Con #6SA330M, 330 µF 6.3 V.
C11 = Sanyo Os–Con #10SA220M, 220 µF 10 V.
L1 = Coilcraft S5088–A, 5.0 µH, 0.11 Ω.
T1 = Coilcraft U6875–A
Primary: 77 turns of # 28 AWG, Pin 1 = start, Pin 8 = finish.
Two layers 0.002″ Mylar tape.
Secondary: 5 turns of # 22 AWG, 2 strands bifiliar wound, Pin 5 = start, Pin 4 = finish.
Two layers 0.002″ Mylar tape.
Auxiliary: 13 turns of # 28 AWG wound in center of bobbin, Pin 2 = start, Pin 7 = finish.
Two layers 0.002″ Mylar tape.
Gap: 0.011″ total for a primary inductance (LP) of 620 µH.
Core and Bobbin: Coilcraft PT1950, E187, 3F3 material.
10
MOTOROLA ANALOG IC DEVICE DATA