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參數(shù)資料
| 型號(hào)： | CA3262 |
| 廠商： | Intersil Corporation |
| 英文描述： | Quad-Gated, Inverting Power Drivers |
| 中文描述： | 四門控，逆變電源驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 4/9頁(yè) |
| 文件大小： | 72K |
| 代理商： | CA3262 |
4
Applications
Typical circuit configurations for applying the CA3262 and
CA3262A are shown in the application circuit of Figure 2. To
their rated capabilities, both circuits can be used to drive induc-
tive, resistive and lamp loads. The CA3262A has a lower V
SAT
than the CA3262 and is rated for 125
o
C ambient temperature
applications. The CA3262 data sheet rating is 85
o
C. Otherwise,
the protection features described apply to both the CA3262 and
CA3262A.
The maximum voltage for full load current switching is the
output sustaining voltage, V
CE(SUS)
which should not exceed
40V. To provide a means of over-voltage protection, on-chip
steering diodes are connected from each output to one of two
CLAMP pins. Over-voltage pulses may be generated from
inductive load switching and must be clamped or limited to a
peak voltage less than V
CE(SUS)
. To limit an inductive voltage
pulse, a zener diode should be connected to the appropriate
CLAMP pin. When the voltage pulse exceeds the zener thresh-
old, the excess energy is dumped to ground via the on-chip
steering diode and the external zener diode.
The on-chip diodes may be used in a free-wheeling mode by
connecting the CLAMP pins to an external clamp supply
voltage. Zener diode clamp protection is preferred over the
power supply clamp option, primarily because the power
supplies may be subject to large transient changes; including
turn-ON and turn-OFF conditions where non-tracking conditions
between supplies could allow forward conduction through the
steering diodes. For all transient conditions of either method, the
clamp voltage should greater than the maximum supply voltage
of the switching outputs and less than V
CE(SUS)
.
Note that the rate of change of the output current during load
switching is fast. Therefore, even small values of inductance,
including the inductance of a few meters of hook-up wire to
the load circuit, can generate voltage spikes of considerable
amplitude at the output terminals and may require clamping
to protect the device ratings.
Current-limiting is provided as protection for shorted or over-
loaded output conditions. Voltage is sampled across a small
metal resistor in the emitter of each output stage. When the volt-
age exceeds a preset comparator level, drive is reduced to the
output. Current limiting is sustained unless thermal conditions
exceed the preset thermal shutdown temperature of 155
o
C.
If an output is shorted, the remaining three outputs will
continue to function normally unless the continued heat
spreading is sufficient to raise the junction temperature at any
other output to a level greater than 155
o
C. High ambient tem-
perature conditions may allow this to happen. The degree of
interaction is minimized at chip layout design by separating
the output devices, each to a separate corner of the chip.
As noted, the thermal resistance values of the PDIP, PLCC
and SOIC packages are improved by direct connection of
the leads to the chip mounting pad. For a normal PC Board
application, the thermal resistance coefficient for each pack-
age can be significantly lowered by increasing ground cop-
per area on the PC board next to the ground pins of the IC.
Input Capacitance, Input
Enable Capacitance
C
IN
C
EN
-
-
-
-
-
-
-
-
3
-
-
pF
pF
4.4
NOTES:
1. The CA3262 and CA3262A have on-chip limiting for transient peak currents. Under short-circuit conditions with voltage applied to the collector
of the output transistor and with the output transistor turned ON, the current will increase to 1.2A, typical. Over-Current Limiting protects a short
circuit condition for a normal operating range of output supply voltage. During a short circuit condition, the output driver will shortly thereafter
(approx. 5ms) go into Over-Temperature Limiting. While Over-Current Limiting may range to peak currents greater than 2A, each output will
typically withstand a direct short circuit up to supply voltage levels of 16V. Excessive dissipation before thermal limiting occurs may cause dam-
age to the chip for supply voltages greater than 18V. The CA3262 and CA3262A are rated to withstand peak current, cold turn-on conditions of
#168 or #194 lamp loads.
2. The total DC current for the CA3262 and CA3262A with all 4 outputs ON should not exceed the total of (4 x 0.7A + Max. I
CC
) ~ 2.85A. This level
of current will significantly increase the chip temperature due to increased dissipation and may cause thermal shutdown in high ambient tem-
perature conditions (See Absolute Maximum Ratings for Dissipation). Any one output may be allowed to exceed 0.7A but may be subject to
Over-Current Limiting above the I
LIM
min. limit of 0.7A. As a practical limit, no single output should be loaded to more than 1A (Max).
3. Normal applications require a surface mount of the 28 lead PLCC and 24 lead SOIC packages on a PC Board. The PLCC, SOIC and PDIP
packages have power lead frame construction through the ground pins to conduct heat from the frame to the PC Board ground area. Thermal
resistance,
θ
JA
, is given for a surface mount of the 28 lead PLCC and the 24 lead SOIC packages on a 1 oz. copper PC board with minimal
ground area and with 2 square inches of ground area.
4. I
CC
varies with temperature. Typically, I
CC(ON)
is 18mA at 125
o
C and 41mA at -40
o
C. Typically, I
CC(OFF)
is 2.2mA at 125
o
C and 1.2mA at
-40
o
C.
5. Tested with a switched-off 500mA Load of 120mH (with 24
series resistance), V
BATT
= 12V and the outputs (V
CE
) clamped to +40V maximum
with an external zener diode.
Electrical Specifications
V
CC
= 5.5V, T
A
= -40
o
C to 125
o
C for CA3262A and V
CC
= 5.5V, T
A
= -40
o
C to 85
o
C for CA3262
Unless Otherwise Specified
(Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
CA3262
TYP
CA3262A
TYP
UNITS
MIN
MAX
MIN
MAX
CA3262A, CA3262
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PDF描述 |
|---|---|
| CA3273 | High-Side Driver |
| CA3274 | Current Limiting Power Switch with Current Limiter Sense Flag |
| CA3274E | Current Limiting Power Switch with Current Limiter Sense Flag |
| CA3275 | Dual Full Bridge Driver(雙路滿橋驅(qū)動(dòng)器) |
| CA3275E | Dual Full Bridge Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CA3262 ENG UP WAF | 制造商:Rochester Electronics LLC 功能描述: |
| CA3262 ENG WAF | 制造商:Rochester Electronics LLC 功能描述: |
| CA3262A | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Quad-Gated, Inverting Power Drivers |
| CA3262A WAF | 制造商:Intersil Corporation 功能描述: |
| CA3262AE | 制造商:Rochester Electronics LLC 功能描述: |
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