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参数资料
| 型号： | CA3272AQ |
| 厂商： | INTERSIL CORP |
| 元件分类： | 外设及接口 |
| 英文描述： | Quad-Gated Inverting Power Drivers with Fault Mode Diagnostic Flag Output |
| 中文描述： | 0.7 A 4 CHANNEL, BUF OR INV BASED PRPHL DRVR, PQCC28 |
| 封装： | PLASTIC, MS-018AB, LCC-28 |
| 文件页数： | 5/10页 |
| 文件大小： | 91K |
| 代理商： | CA3272AQ |
5
Applications
The CA3272A and CA3292A are quad-gated inverting low-
side power drivers with a fault diagnostic flag output. Both
circuits are rated for 125
o
C 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.
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 125
o
C 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.
Any one output that faults (see Fault Logic Table) will switch the
FAULT output at pin 1 to a constant current pull-down.
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, Q
F
thru A 2
input AND gate.
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 Q
F
“ON” if a
fault is detected. Transistor Q
F
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 165
o
C typical. When the junction temperature of
a driver exceeds the 165
o
C 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 15
o
C, the output is turned on.
FAULT LOGIC TABLE
IN
OUT
FAULT
MODE
H
L
H
Normal
H
H
L
Over Current, Over Temperature Open
Load or Short to Power Supply
L
L
L
L
H
H
Normal
V
CC
REFERENCE
1.2 VOLTS
CONSTANT
CURRENT SOURCE
INPUT
TO PREDRIVER
AND
OUTPUT STAGES
ENABLE
FIGURE 1. SCHEMATIC OF ONE INPUT STAGE
FAULT
LOGIC
OUTPUT
1
C
X
R
X
V
CC
= +5V
ENABLE IN
FAULT MODE
INPUT
CHANNEL “A”
T
X
= R
X
C
X
≈
0.5 TO 1ms
Q
F
I
F(SINK)
FAULT FLAG
DIAGNOSTIC
OUTPUT, V
F
B, C AND D
FAULT MODE
INPUTS
FIGURE 2. EXTERNAL FAULT OUTPUT CIRCUIT AND I
F(SINK)
AS FAULT SINK PULLDOWN CURRENT, WHICH IS
ACTIVATED BY TRANSISTOR, Q
F
, WHEN A FAULT
EXISTS
CA3272A, CA3292A
相关PDF资料 |
PDF描述 |
|---|---|
| CA3292AM | Quad-Gated Inverting Power Drivers with Fault Mode Diagnostic Flag Output |
| CA3292AQ | Quad-Gated Inverting Power Drivers with Fault Mode Diagnostic Flag Output |
| CA3304 | 4-Bit, 25 MSPS, Flash A/D Converters(4位、采样速率为25MSPS、闪速A/D转换器) |
| CA3304A | 4-Bit, 25 MSPS, Flash A/D Converters |
| CA3304AD | 4-Bit, 25 MSPS, Flash A/D Converters |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CA3272AQ WAF | 制造商:Harris Corporation 功能描述: |
| CA3272Q | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CA3272QR3306 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CA3272QX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CA3273 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Side Driver |
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