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SIC789 Datasheet(PDF) 5 Page - Vishay Siliconix

Part # SIC789
Description  60 A VRPower® Integrated Power Stage
Download  19 Pages
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Manufacturer  VISHAY [Vishay Siliconix]
Direct Link  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SIC789 Datasheet(HTML) 5 Page - Vishay Siliconix

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SiC789, SiC789A
www.vishay.com
Vishay Siliconix
S14-2287-Rev. B, 08-Dec-14
5
Document Number: 62972
For technical questions, contact: powerictechsupport@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
Notes
(1) Typical limits are established by characterization and are not production tested.
(2) Guaranteed by design.
DETAILED OPERATIONAL DESCRIPTION
PWM Input with Tri-state Function
The PWM input receives the PWM control signal from the VR
controller IC. The PWM input is designed to be compatible
with standard controllers using two state logic (H and L) and
advanced controllers that incorporate tri-state logic (H, L
and tri-state) on the PWM output. For two state logic, the
PWM input operates as follows. When PWM is driven above
VPWM_TH_R the low-side is turned OFF and the high-side is
turned ON. When PWM input is driven below VPWM_TH_F the
high-side is turned OFF and the low-side is turned ON. For
tri-state logic, the PWM input operates as previously stated
for driving the MOSFETs when PWM is logic high and logic
low. However, there is a third state that is entered as the
PWM output of tri-state compatible controller enters its high
impedance state during shut-down. The high impedance
state of the controller’s PWM output allows the SiC789 and
SiC789A to pull the PWM input into the tri-state region (see
definition of PWM logic and Tri-State, fig. 4). If the PWM
input stays in this region for the Tri-state Hold-Off Period,
tTSHO, both high-side and low-side MOSFETs are turned
OFF. The function allows the VR phase to be disabled
without negative output voltage swing caused by inductor
ringing and saves a Schottky diode clamp. The PWM and
tri-state regions are separated by hysteresis to prevent
false triggering. The SiC789A incorporates PWM voltage
thresholds that are compatible with 3.3 V logic and the
SiC789 thresholds are compatible with 5 V logic.
Disable (DSBL#)
In the low state, the DSBL# pin shuts down the driver IC and
disables both high-side and low-side MOSFETs. In this
state, standby current is minimized. If DSBL# is left
unconnected, an internal pull-down resistor will pull the pin
to CGND and shut down the IC.
Pre-Charger Function
When DSBL# is driven from below VIL_DSBL# to above
VIH_DSBL# the low-side is turned ON for a short duration
(60 ns typical) to refresh the BOOT capacitor in case it has
been discharged due to the driver being in standby for a
long period of time.
Diode Emulation Mode (SMOD#)
When SMOD# is logic low diode emulation mode is enabled
and the low-side is turned OFF. This is a non-synchronous
conversion mode that improves light load efficiency by
reducing switching losses. Conducted losses that occur in
synchronous buck regulators when inductor current is
negative can also be reduced. Circuitry in the external
controller IC detects when inductor current crosses zero
and drives SMOD# below VIL_SMOD# turning the low-side
MOSFET OFF. The function can be also be used for a
pre-biased output voltage. If SMOD# is left unconnected, an
internal pull up resistor will pull the pin to VCIN (logic high) to
disable the SMOD# function.
Thermal Shutdown Warning (THWn)
The THWn pin is an open drain signal that flags the presence
of excessive junction temperature. Connect, with a
maximum of 20 k
Ω, to VCIN. An internal temperature sensor
detects
the
junction
temperature.
The
temperature
threshold is 160 °C. When this junction temperature is
exceeded the THWn flag is set. When the junction
temperature drops below 135 °C the device will clear the
THWn signal. The SiC789 and SiC789A do not stop
operation when the flag is set. The decision to shutdown
must be made by an external thermal control function.
DSBL# SMOD# INPUT
DSBL# Logic Input Voltage
VIH_DSBL#
Input logic high
2
-
-
V
VIL_DSBL#
Input logic low
-
-
0.8
SMOD# Logic Input Voltage
VIH_SMOD#
Input logic high
2
-
-
VIL_SMOD#
Input logic low
-
-
0.8
PROTECTION
Under Voltage Lockout
VUVLO
VCIN rising, on threshold
-
3.7
4.1
V
VCIN falling, off threshold
2.7
3.1
-
Under Voltage Lockout Hysteresis
VUVLO_HYST
-
575
-
mV
THWn Flag Set (2)
TTHWn_SET
-
160
-
°C
THWn Flag Clear (2)
TTHWn_CLEAR
-
135
-
THWn Flag Hysteresis (2)
TTHWn_HYST
-25-
THWn Output Low
VOL_THWn
ITHWn = 2 mA
-
0.02
-
V
ELECTRICAL SPECIFICATIONS
(DSBL# = SMOD# = 5 V, VIN = 12 V, VDRV and VCIN = 5 V, TA = 25 °C)
PARAMETER
SYMBOL
TEST CONDITION
LIMITS
UNIT
MIN.
TYP.
MAX.


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