CA3272A Datasheet, PDF (2/10 Pages) Intersil Corporation – Quad-Gated Inverting Power Drivers with Fault Mode Diagnostic Flag Output

CA3272A, CA3292A
Block Diagram of the CA3272A
ENABLE
IN D
V_CC
F
T_LIM
OUT D
Q_D
I_LIM
0.02Ω
IN C
F
T_LIM
OUT C
Q_C
I_LIM
0.02Ω
IN B
F
T_LIM
OUT B
Q_B
I_LIM
0.02Ω
IN A
FAULT
F
T_LIM
OUT A
Q_A
I_LIM
0.02Ω
TRUTH TABLE
ENABLE
IN
OUT
H
H
L
H
L
H
L
X
H
H = High, L = Low, X = Don’t Care
Block Diagram of the CA3292A
ENABLE LINE
(1 of 4 Outputs Shown with Expanded Fault Logic)
TO B, C AND D
INPUTS AND
NOTE: The CA3292A is identical to the CA3272A except for the ^{FAULT OUTPUT}
collector-to-base Zener diode on each low side power output driver
(shown here as Z_A). The Zener diode clamp is used as an over-
voltage clamp to protect the output when switching inductive loads.
When the output voltage exceeds the Zener threshold, Q_A conducts
to suppress further increase in output voltage. The fault sense and ENABLE
fault flag logic circuits are the same in the CA3272A and CA3292A.
FAULT
FLAG LOGIC
FAULT INPUT
FROM B, C, D
CHANNELS
FAULT
Q_F
IN A
FAULT SENSE
CHANNEL A
4V
T_LIM
Z_A
Q_A
CHANNEL A
1 OF 4
I_LIM
OUTPUTS
0.02Ω
OUT A
2