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CS8312YDR8 Scheda tecnica(PDF) 3 Page - Cherry Semiconductor Corporation

Il numero della parte CS8312YDR8
Spiegazioni elettronici  IGBT Ignition Predriver with Dynamic Current Regulation
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Produttore elettronici  CHERRY [Cherry Semiconductor Corporation]
Homepage  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS8312YDR8 Scheda tecnica(HTML) 3 Page - Cherry Semiconductor Corporation

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Electrical Characteristics continued
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
8L PDIP & SO
1
FLAG
Indicates whether current through the IGBT has reached a pre-
set level.
2
SENSE+
Positive input to current comparator.
3
SENSEÐ
Ground (SENSE-) for current sense resistor.
4
Gnd
Ground connection.
5
OUT
Output voltage to IGBT (MOSFET) gate.
6
CLI
Current limit input increase.
7
CTRL
Control input.
8VCC
Supply voltage.
The flag indicates when the voltage across the two sense
pins is approaching a current limit level that has been
determined by the value of the external sense resistor
(RSENSE) and the state of the CTRL and CLI pins. If the
voltage across the sense pins (SENSE+, SENSE-) is less
than the flag turn-on voltage, then the FLAG is off. When
the voltage between the sense pins equals the FLAG turn
on voltage, the FLAG will latch on until the CTRL pin
goes low. FLAG is disabled whenever CTRL is low.
Changing the CLI pin from low to high will increase
nominal FLAG turn on voltage by approximately 45%.
Table 1 FLAG Timing Sequence
The CS8312 output (OUT) saturates and supplies voltage
to the IGBT (or MOSFET) gate once the CTRL switches
from low to high. As current through the IGBT (MOSFET)
increases and the voltage across the sense resistor passes
the flag turn on voltage, the FLAG will turn on. If the cur-
rent through the sense resistor continues to rise and the
sense resistor voltage reaches the regulation sense volt-
age, then the gate voltage will fall to a level that regulates
the driver and maintains the regulation sense voltage at
the sense resistor.
Changing the CLI pin from a logic low to a logic high
increases the FLAG turn on voltage by approximately
45% and the regulation sense voltage by approximately
39% respectively.
Current Limit Function
Output Stage
State
CONTROL
SENSE+
FLAG
0
Low
X
OFF
1
High
Below Threshold
OFF
2
High
Above Threshold
ON
3
High
X
ON
0
Low
X
OFF
Flag Function (see Application Diagram)
Circuit Description
s Flag Function: continued
Turn Off Delay
CTRL decreasing
10
us
Turn On Delay
10
us
Disable Time
100
450
us
s Sense Function
Input Voltage Range
-0.3
2.5
V
Sense Regulation Voltage
VCTRL=5.5V; VCLI=-0.3V
270
295
320
mV
VCTRL=5.5V; VCLI=5.5V
380
410
440
mV
Input Leakage Current
VCTRL=5.5V
5
µA
Propagation Delay
VCTRL=5.5V
20
us


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