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PDF CA3292A Data sheet ( Hoja de datos )
| Número de pieza | CA3292A | |
| Descripción | Quad-Gated Inverting Power Drivers with Fault Mode Diagnostic Flag Output | |
| Fabricantes | Intersil | |
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CA3272A, CA3292A
July 1997
Quad-Gated Inverting Power Drivers with Fault
Mode Diagnostic Flag Output
Features
• Load Current Switching 600mA
• Suitable for Resistive or Inductive Loads
• Fault Mode Diagnostic Flag Output
• CA3292A Over-Voltage Zener Clamp
• Independent Over-Current Limiting
• Independent Over-Temperature Shutdown
• Temperature Shutdown Hysteresis
• 5V CMOS or TTL Input Logic
• High Dissipation Power-Frame Package
• Operating Temperature Range -40oC to 125oC
Applications
• Solenoids
• Relays
• Lamps
• Steppers
• Injectors
• Motors
System Applications
• Automotive
• Appliance
• Industrial Control
• Robotics
Ordering Information
PART NUMBER
CA3272AQ
CA3292AQ
CA3272AM
CA3292AM
TEMP.
RANGE (oC)
PACKAGE
-40 to 125 28 Ld PLCC
-40 to 125 28 Ld PLCC
-40 to 125 28 Ld SOIC
-40 to 125 28 Ld SOIC
PKG.
NO.
N28.45
N28.45
M28.3
M28.3
Description
The CA3272A and CA3292A are Quad-Gated Inverting Power
Drivers for interfacing low-level logic to inductive and resistive
loads such as: relays, solenoids, AC and DC motors and resis-
tive loads such as incandescent lamps and other power drivers.
Each output is an open collector protected power transistor
driver. The CA3292A is similar to the CA3272A, except for an
added collector-to-base Zener diode that provides over-voltage
clamping protection on each power switching output. The
CA3292A block diagram is shown for one switching channel
with fault detection logic plus the output fault driver circuit for all
four switching channels. The FAULT output pin provides a flag
output when a fault condition occurs. All four Output Power
Driver stages are shown in the Block Diagrams.
The ENABLE input is common to each of the four power
switches and when low, disables the FAULT output. From the
Input to Output, each switch is inverting. When IN is high, OUT
is low and the transistor switch is “ON” (conducting). The block
diagram shows the functional logic associated with fault detec-
tion. The Fault Sense circuit detects the IN and OUT states and
switches QF “ON” if a fault is detected. When a fault is detected,
transistor QF activates a current sink pull-down at the FAULT
pin. A resistive load from the FAULT pin to the power supply is
used to detect a fault as a low state. Both shorted and open
load conditions are detected.
Note: The CA3272A replaces the CA3272 for new designs.
Refer to the Fault Sink Current specifications when making
design changes. The CA3272A and CA3292A have increased
pull-down current drive from the FAULT output pin.
Pinouts
CA3272A, CA3292A (PLCC)
TOP VIEW
INDEX
GND 5
GND 6
GND 7
GND 8
GND 9
GND 10
GND 11
4 3 2 1 28 27 26
25 GND
24 GND
23 GND
22 GND
21 GND
20 GND
19 GND
12 13 14 15 16 17 18
CA3272A, CA3292A (SOIC)
TOP VIEW
OUT B
NC
NC
NC
NC
GND
GND
GND
GND
NC
NC
NC
NC
OUT C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 OUT A
27 FAULT
26 IN A
25 IN B
24 ENABLE
23 GND
22 GND
21 GND
20 GND
19 NC
18 VCC
17 IN C
16 IN D
15 OUT D
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
1
File Number 2223.7
1 page  
CA3272A, CA3292A
Applications
The CA3272A and CA3292A are quad-gated inverting low-
side power drivers with a fault diagnostic flag output. Both
circuits are rated for 125oC ambient temperature applica-
tions and have current limiting and thermal shutdown. While
functionally similar to the CA3262AQ, they differ in the mode
of over-voltage protection and have the added feature of a
FAULT flag output. Also, as shown in Figure 1, the inputs to
channels A, B, C, D and ENABLE have internal pulldowns to
turn “OFF” the outputs when the inputs are floating.
INPUT
VCC
CONSTANT
CURRENT SOURCE
REFERENCE
1.2 VOLTS
ENABLE
TO PREDRIVER
AND
OUTPUT STAGES
The Fault Logic circuit, as shown in the Block Diagram for
the CA3292A, applies to both the CA3272A and CA3292A.
The Fault Sense circuits do not override or control the power
switching circuits of the IC. Their primary function is to pro-
vide an external diagnostic fault flag output. Each Power
Switching Channel has diagnostic fault sensing input to the
Fault Logic. The Fault Logic block of the functional Block Dia-
gram illustrates the logic functions associated with Fault
detection. The diagnostic output for each of the four channels
of switching is processed through the fault logic circuit associ-
ated with each channel. It is then passed to an OR gate
which controls the FAULT flag output transistor, QF thru A 2
input AND gate.
ENABLE IN
B, C AND D
FAULT MODE
INPUTS
IF(SINK)
VCC = +5V
1
FAULT
LOGIC
OUTPUT
QF
RX
FAULT FLAG
DIAGNOSTIC
OUTPUT, VF
CX
FIGURE 1. SCHEMATIC OF ONE INPUT STAGE
TX = RXCX ≈ 0.5 TO 1ms
As noted in the Block Diagrams, the CA3292A is equivalent
to the CA3272A except that it has internal clamp diodes on
the outputs to handle inductive switching pulses from the
output load. The structure of each CA3292A output includes
a Zener diode from collector-to-base of the output transistor.
This is a different form of protection from other quad drivers
with current steering clamp diodes on each output, paired to
one of two “CLAMP” output pins. The CA3292A output tran-
sistor will turn-on at the Zener diode clamp voltage threshold
which is typically 32V and the output transistor will dump the
pulse energy through the output driver to ground.
Each output driver is capable of switching 600mA load currents
and operate at 125oC ambient temperature without interaction
between the outputs. The CA3272A and CA3292A can drive
four incandescent lamp loads without modulating their brilliance
when the “cold” lamps are energized. The outputs can be con-
nected in parallel to drive larger loads. Over-current or short cir-
cuit output load conditions are fault protected by current limiting
with a typical limit value of 1.2A. The current limiting range is
set for 0.6A to 1.6A. The output stage does not change state
(oscillate) when in the current limit mode.
FAULT LOGIC TABLE
IN OUT FAULT
MODE
HL
H Normal
HH
LL
L Over Current, Over Temperature Open
Load or Short to Power Supply
L
LH
H Normal
Any one output that faults (see Fault Logic Table) will switch the
FAULT output at pin 1 to a constant current pull-down.
FAULT MODE
INPUT
CHANNEL “A”
FIGURE 2. EXTERNAL FAULT OUTPUT CIRCUIT AND IF(SINK)
AS FAULT SINK PULLDOWN CURRENT, WHICH IS
ACTIVATED BY TRANSISTOR, QF, WHEN A FAULT
EXISTS
The ENABLE input is common to each of the 4 power
switches and also disables the FAULT flag output at the
2 input AND gate when it is low. The Fault Logic circuit
senses the IN and OUT states and switches QF “ON” if a
fault is detected. Transistor QF activates a sink current
source to pull-down the FAULT pin to a 0 (low) state when
the fault is detected. Both shorted and open load conditions
are detected.
It is normal for thermal shutdown and current limiting to
occur sequentially during a short circuit fault condition. A
precaution applies for potential damage from high transient
dissipation during thermal shutdown. (See Note 1 following
the Electrical Specifications Table).
Each of the outputs are independently protected with over-
current limiting and over-temperature shutdown with thermal
hysteresis. If an output is shorted, the remaining outputs
function normally unless the temperature rise of the other
output devices can be made to exceed their shutdown tem-
perature of 165oC typical. When the junction temperature of
a driver exceeds the 165oC thermal shutdown value, that
output is turned off. When an output is shutdown, the result-
ing decrease in power dissipation allows the junction tem-
perature to decrease. When the junction temperature
decreases by approximately 15oC, the output is turned on.
5
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| PDF Descargar | [ Datasheet CA3292A.PDF ] | |
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