HIP6019B
Functional Pin Description
VSEN1, VSEN2 (Pins 22 and 15)
These pins are connected to the PWM converters’ output
voltages. The PGOOD and OVP comparator circuits use
these signals to report output voltage status and for over-
voltage protection. VSEN2 provides the input power to the
integrated linear regulator.
PHASE1, PHASE2 (Pins 26 and 2)
Connect the PHASE pins to the respective PWM converter’s
upper MOSFET source. These pins are used to monitor the
voltage drop across the upper MOSFETs for over-current
protection.
UGATE1, UGATE2 (Pins 27 and 1)
Connect UGATE pins to the respective PWM converter’s
upper MOSFET gate. These pins provide the gate drive for
the upper MOSFETs.
OCSET1, OCSET2 (Pins 23 and 9)
Connect a resistor (R
OCSET
) from this pin to the drain of the
respective upper MOSFET. R
OCSET
, an internal 200µA
current source (I
OCSET
), and the upper MOSFET on-
resistance (r
DS(ON)
) set the converter over-current (OC) trip
point according to the following equation:
I
OCSET
×
R
OCSET
I
PEAK
= ---------------------------------------------------
-
r
DS
(
ON
)
PGND (Pin 24)
This is the power ground connection. Tie the synchronous
PWM converter’s lower MOSFET source to this pin.
LGATE1 (Pin 25)
Connect LGATE1 to the synchronous PWM converter’s
lower MOSFET gate. This pin provides the gate drive for the
lower MOSFET.
An over-current trip cycles the soft-start function. Sustaining an
over-current for 2 soft-start intervals shuts down the controller.
Additionally, OCSET1 is an output for the inverted FAULT
signal (FAULT). If a fault condition causes FAULT to go high,
OCSET1 will be simultaneously pulled to ground though an
internal MOS device (typical r
DS(ON)
= 100Ω).
VCC (Pin 28)
Provide a 12V bias supply for the IC to this pin. This pin also
provides the gate bias charge for all the MOSFETs
controlled by the IC.
FAULT/RT (Pin 13)
This pin provides oscillator switching frequency adjustment.
By placing a resistor (R
T
) from this pin to GND, the nominal
200kHz switching frequency is increased according to the
following equation:
6
5
×
10
Fs
≈
200kHz + --------------------
-
R T
(
kΩ
)
(R
T
to GND)
SS (Pin 12)
Connect a capacitor from this pin to ground. This capacitor,
along with an internal 11µA current source, sets the soft-
start interval of the converter. Pulling this pin low (typically
below 1.0V) with an open drain signal will shutdown the IC.
VID0, VID1, VID2, VID3, VID4 (Pins 7, 6, 5, 4 and 3)
VID0-4 are the input pins to the 5-bit DAC. The states of
these five pins program the internal voltage reference
(DACOUT). The level of DACOUT sets the core converter
output voltage (V
OUT1
). It also sets the core PGOOD and
OVP thresholds.
Conversely, connecting a pull-up resistor (R
T
) from this pin
to VCC reduces the switching frequency according to the
following equation:
7
4
×
10
Fs
≈
200kHz
–
--------------------
-
R T
(
kΩ
)
(R
T
to 12V)
COMP1, COMP2, and FB1, FB2
(Pins 20, 11, 21, and 10)
COMP1, 2 and FB1, 2 are the available external pins of the
PWM error amplifiers. Both the FB pins are the inverting
input of the error amplifiers. Similarly, the COMP pins are the
error amplifier outputs. These pins are used to compensate
the voltage-control feedback loops of the PWM converters.
Nominally, this pin voltage is 1.26V, but is pulled to VCC in
the event of an over-voltage or over-current condition.
GATE3 (Pin 18)
Connect this pin to the gate of an external MOSFET. This
pin provides the drive for the linear controller’s pass
transistor.
GND (Pin 17)
Signal ground for the IC. All voltage levels are measured
with respect to this pin.
FB3 (Pin 19)
Connect this pin to a resistor divider to set the linear
controller output.
PGOOD (Pin 8)
PGOOD is an open collector output used to indicate the
status of the PWM converter output voltages. This pin is
pulled low when the core output is not within
±10%
of the
DACOUT reference voltage, or when any of the other
outputs are below their under-voltage thresholds. The
PGOOD output is open for ‘11111’ VID code. See Table 1.
6
VOUT4 (Pin 16)
Output of the linear regulator. Supplies current up to 230mA.
FB4 (Pin 14)
Connect this pin to a resistor divider to set the linear
regulator output.
FN4587.1
April 13, 2005
INTERSIL [ INTERSIL CORPORATION ]
