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CA3272 Datasheet(Scheda tecnica) 4 Page - Intersil Corporation

Numero della parte CA3272
Dettagli  Quad-Gated Inverting Power Drivers with Fault Mode Diagnostic Flag Output
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Produttore  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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4
Output Driver Fault Sense, Low Threshold
(Short)
VLTHD
VIN = VEN = 2V (Note 6)
3
4
5.5
V
PROTECTION PARAMETERS
Over-Current Limiting
ILIM
VIN = VEN = 2V, VOUT = 4Ω to 16V
0.7
-
Note 1
A
Over-Temperature Limiting
(Junction Temperature)
TLIM
-
165
-
oC
Over-Temperature Limiting, Hysteresis
THYS
-15-
oC
DESIGN PARAMETERS
Input Capacitance
CIN
-3-
pF
Enable Capacitance
CEN
-
4.6
-
pF
NOTES:
1. Output Transient Currents are controlled by on-chip limiting for each output. 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 (approximately 5ms) go into Over-Temperature Shutdown. While Over-Current Limiting may range to peak cur-
rents as high as 1.6A, each output will typically withstand a direct short circuit at normal single battery supply levels. Excessive dissi-
pation before thermal shutdown occurs may cause damage to the chip for supply voltages greater than 16V. When sequentially
switched, the outputs are rated to withstand peak current, cold turn-on conditions of lamp loads such as #168 or #194 lamps.
2. The total DC current with all 4 outputs ON should not exceed the total of (4 x 0.7A + Max. ICC) ~ 2.85A. This level of current will signif-
icantly increase the chip temperature due to increased dissipation and may cause thermal shutdown in high ambient temperature con-
ditions (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 ILIM minimum limit of 0.7A. No single output should be loaded to more than Over-Current Limiting above
the ILIM minimum limit of 0.7A. As a practical limit, no single output should be loaded to more than 1A maximum.
3. The PLCC and SOIC packages have power lead frame construction through the ground pins to conduct heat from the frame to the PC
Board ground area. Thermal resistance,
θJA is given for a surface mount of the 28 lead PLCC and the 28 lead SOIC packages on a 1 oz.
copper PC board with minimal ground area and with a 2 square inches of ground area.
4. ICEX is the static leakage current at each output when that output is OFF (ENABLE Low). Refer to the Figure 3 illustration of an output
stage. The value of ICEX is both the leakage into the output driver and a pull-down current sink, IO(SINK). The purpose of the current
sink is to detect open load conditions.
5. The IOL value of “Output Low Current, IF(SINK)” at the FAULT pin is both the static leakage of the output driver QF and the current sink,
IF(SINK). The current sink is active only when a fault exists. When no fault exists, the IOH current at the FAULT pin is the maximum
leakage current, IF(LK). Refer to Figure 2 for an illustration of the FAULT output and associated external components. Refer to FAULT
LOGIC TABLE for Fault Modes.
6. The Voltages, VHTHD, VLTHD are the comparator threshold reference values (Min. and Max. Range) sensed as a high and low state
transitions for voltage forced at the outputs. VHTHD indicates an open load fault when the output is decreased to less than the threshold.
VLTHD indicates a shorted load when the output is increased greater than the threshold. The output voltage is changed until the FAULT
pin indicates a Low (Fault). Refer to Figure 2 for test value of external resistor. Refer to IOL and IOH FAULT PARAMETERS Test Limits
to determine VOL and VOH at the FAULT pin.
7. Tested with 120mA switched off in a Load of 70mH and 32
Ω series resistance;
CA3272A: Outputs clamped with an external Zener diode, limiting VOUT to the VCE(SUS) maximum rating of +40V.
CA3292A: Outputs limited to the VCLAMP voltage by the internal collector-to-base Zener diode and output transistor clamp.
8. The single pulse clamp energy rating for the CA3292A is defined over a range of operating conditions. The Clamp Energy is a function
of the Load Inductance, Load Resistance, Clamp Voltage, Supply Voltage, the Saturated ON Resistance (VSAT) and the Steady State
Load Current at the instant of Turn-OFF. Refer to Figure 5 for the Safe Operating Area when driving inductive loads. Rating limits for
Energy vs Single Pulse Width Time are plotted for different coil values. Refer to Application Note - AN9416 for pulse energy calculation
methods.
Electrical Specifications
TA = -40
oC to 125oC, V
CC = 5.5V, Unless Otherwise Specified (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
CA3272A, CA3292A




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