ISL8201M 查看數據表（PDF） - Renesas Electronics
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ISL8201M Datasheet PDF : 16 Pages
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ISL8201M
Pin Functions
PGND (Pins 1, 2, 3, 4, 11)
Power ground pin for signal, input, and output return path. PGND
needs to connect to one (or more) ground plane(s) immediately,
which is recommended to minimize the effect of switching noise,
copper losses, and maximize heat dissipation.
PVCC (Pin 5)
This pin provides the bias supply for ISL8201M, as well as the
low-side MOSFET’s gate and high-side MOSFET’s gate. If
PVCC rises above 6.5V, an internal 5V regulator will supply to
the internal logics bias (but high-side and low-side MOSFET
gate will still be sourced by PVCC). Connect a well decoupled
+5V or +12V supply to this pin.
NC (Pins 6, 8, 15)
These pins have no function; do not connect.
ISET (Pin 7)
The ISET pin is the input for the overcurrent protection (OCP)
setting, which compares the rDS(ON) of the low-side MOSFET
to set the overcurrent threshold. The ISL8201M has an initial
protect overcurrent limit. It has an integrated internal 3.57k
resistor (RSET-IN) between the ISET and PGND pins, which
can prevent significant overcurrent impact to the module. One
can also connect an additional resistor RSET-EX between the
ISET pin and the PGND pin in order to reduce the current limit
point by paralleling.
VIN (Pin 9)
Power input pin. Apply input voltage between the VIN pin and
PGND pin. It is recommended to place an input decoupling
capacitor directly between the VIN pin and the PGND pin. The
input capacitor should be placed as closely as possible to the
module.
PHASE (Pin 10)
The PHASE pin is the switching node between the high and
low-side MOSFET. It also returns the current path for the high-
side MOSFET driver and detects the low-side MOSFET drain
voltage for the overcurrent limits point.
VOUT (Pin 12)
Power output pin. Apply output load between this pin and the
PGND pin. It is recommended to place a high frequency output
decoupling capacitor directly between the VOUT pin and the
PGND pin. The output capacitor should be placed as closely
as possible to the module.
COMP/EN (Pin 13)
This is the multiplexed pin of the ISL8201M. During soft-start
and normal converter operation, this pin represents the output
of the error amplifier. Use COMP/EN in combination with the
FB pin to compensate for the voltage control feedback loop of
the converter. Pulling COMP/EN low (VENDIS = 0.4V nominal)
will disable (shut-down) the controller, which causes the
oscillator to stop, and the high-side gate and low-side gate of
FN6657 Rev 3.00
October 28, 2014
the MOSFETs outputs to be held low. The external pull-down
device will initially need to overcome a maximum of 5mA of
COMP/EN output current. However, once the controller is
disabled, the COMP/EN output will also be disabled, thus only
a 20µA current source will continue to draw current.
FB (Pin 14)
The FB pin is the output voltage adjustment of the ISL8201M. It
will regulate to 0.6V at the FB pin with respect to the PGND pin.
The ISL8201M has an integrated voltage dividing resistor. This
is a precision 9.76k resistor (RFB-TI) between the VOUT and
FB pins. Different output voltages can be programmed with
additional resistors between FB to PGND.
Reference Circuitry For General Applications
Typical Application with Single Power Supply
Figure 11 shows the ISL8201M application schematic for input
voltage +5V or +12V. The PVCC pin can connect to the input
supply directly.
CPVCC
RFB RSET-EX
PVCC
COMP/EN
VIN
ISL8201M
FB
PHASE
ISET
VOUT
PGND
(+5V/+12V)
VIN
CIN
VOUT
COUT
FIGURE 11. TYPICAL APPLICATION SCHEMATIC
Typical Application with Separated Power Supply
Figure 12 shows the ISL8201M application schematic for wide
input voltages from +1V to +20V. The PVCC supply can source
+5V/+12V or +6.5V to 14.4V.
(+5V/+12V)
or
PVCC
(+6.5V TO 14.4V) CPVCC
RFB RSET-EX
PVCC
COMP/EN
VIN
ISL8201M
FB
PHASE
ISET
VOUT
PGND
(+1V TO +20V)
VIN
CIN
VOUT
COUT
FIGURE 12. WIDE INPUT VOLTAGE APPLICATION SCHEMATIC
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