NCP1075PSRGEVB_SCHEMATIC - 30 KB

Schematic for the NCP1075PSRGEVB Evaluation Board
J1
L1A
F1
1 mH
1.5A
C1
AC Input
T1
0.1uF
"X"
R1
4.7 ohms
3W
R2A
C2
0.1uF
"X"
L1B
3.3M
D1-D4
MRA4007
X4
C3
R3
C4
68K
1/2W
1nF
1kV
D5
22uF
400V
U1
R2B
3.3M
1 mH
Primary
Ground
Plane
4
1N4937
NCP1075
(100 kHz)
J2
C9A C9B
+
7,8
R4
MMSD
4148A R5
1K
22
C5
22uF
25V
4
D7
3
2
1
1
D6
C6
Q1
MBRS
260T3
Secondary
Ground
Plane
2
22uF
25V
R6
120
0.1uF
50V
5,6
3
C10
12Vout
Z2
C11
_
1000uF, MMSZ 0.1uF
16V x 2 5245B 50V
C8
1nF "Y1"
C7
1nF
NOTES:
Z1
R7
MMSZ
5241B
680
1. Crossed schematic lines are not connected.
2. R4 value dependent on aux winding turns and Vout setpoint.
3. R1 is optional inrush limiting resistor.
4. U1 tab (pin 4) and D7 should have heatsinking clad pours.
5. Heavy lines indicate recommended ground plane areas.
6. L1A/L1B are Wurth 7447728102.
7. Q1 is MMBT2222A or similar.
8. Z1 sets Vout (Vout = Vz + 0.6V for Ns:Naux = 1:1).
9. R6 trims Vout (up only).
10. Z2 is optional no load OVP zener (Vz = Vout + 2V)
10 Watt NCP1075 Power Supply
with Primary Side Sensing (Rev 1A)
4/7/2014
-1-
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