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NX-HD10
UPC2933AT-W (IC901) : Regulator
1. Pin layout
1 2 3
3. Block diagram
Start-up
circuit
TC74VHC125FT-X (IC932) : Buffer
1. Pin layout & block diagram
1G 1
1A 2
1Y 3
2G 4
2A 5
2Y 6
GND 7
1-42
4
Reference
Error
voltage
amp.
Thermal
shut down
14 Vcc
13 4G
12 4A
11 4Y
10 3G
9 3A
8 3Y
2. Pin function
Pin No.
Function
Input
1
2
Gnd
3
Output
4
Gnd (Fin)
Safe operating
area protection
Saturation
Drive
protection
circuit
Over current
protection
2. Truth table
INPUTS
G
A
H
X
L
L
L
H
X: Don't care
Z:High impedance
INPUT
OUTPUT
GND
OUTPUTS
Y
Z
L
H
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