NCD5702
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3
Table 1. PIN FUNCTION DESCRIPTION
Pin Name No. I/O/x Description
EN 1 I Enable input allows additional gating of VOH and VOL, and can be used when the driver output
needs to be turned off independent of the Microcontroller input. EN is internally clamped to 5 V and
has a pull−up resistor of 1 MW.
VIN 2 I Input signal to control the output. In applications which require galvanic isolation, VIN is generated
at the opto output, the pulse transformer secondary or the digital isolator output. VOIH/VOL signal is
in phase with VIN. VIN is internally clamped to 5 V and has a pull−down resistor of 1 MW to ensure
that output is low in the absence of an input signal. A minimum pulse−width is required at VIN be-
fore VOH/VOL are activated.
VREF 3 O 5 V Reference generated within the driver is brought out to this pin for external bypassing and for
powering low bias circuits (such as digital isolators).
FLT 4 O Fault open drain output (active low) that allows communication to the main controller that the driver
has encountered a fault condition and has deactivated the output. Open drain allows easy setting of
(inactive) high level and parallel connection of multiple fault signals.
Connect to 10k pull−up resistor recommended. Truth Table is provided in the datasheet to indicate
conditions under which this signal is asserted. Capable of driving optos or digital isolators when
isolation is required.
GNDA 5 x This pin provides a convenient connection point for bypass capacitors (e.g REF) on the left side of
the package.
NC 6,8 x Pins not internally connected.
RSVD 7 x Reserved. No connection is allowed.
DESAT 9 I Input for detecting the desaturation of IGBT due to a fault condition. A capacitor connected to this
pin allows a programmable blanking delay every ON cycle before DESAT fault is processed, thus
preventing false triggering.
VCC 10 x Positive bias supply for the driver. The operating range for this pin is from UVLO to the maximum. A
good quality bypassing capacitor is required from this pin to GND and should be placed close to the
pins for best results.
VOH 11 O Driver high output that provides the appropriate drive voltage and source current to the IGBT gate.
VOL 12 O Driver low output that provides the appropriate drive voltage and sink current to the IGBT gate. VOL
is actively pulled low during start−up and under Fault conditions.
GND 13 x This pin should connect to the IGBT Emitter with a short trace. All power pin bypass capacitors
should be referenced to this pin and kept at a short distance from the pin.
VEE 14 x A negative voltage with respect to GND can be applied to this pin and that will allow VOL to go to a
negative voltage during OFF state. A good quality bypassing capacitor is needed from VEE to GND.
If a negative voltage is not applied or available, this pin must be connected to GND.
VEEA 15 x Analog version of the VEE pin for any signal trace connection. VEE and VEEA are internally con-
nected.
CLAMP 16 I/O Provides clamping for the IGBT gate during the off period to protect it from parasitic turn−on. To be
tied directly to IGBT gate with minimum trace length for best results.
