ZY2140 40A No-Bus POL Data Sheet
8V to 14V Input
• 0.5V to 3.65V Output
ZD-02014 Rev. BB4, 11-Oct-2011 www.power-one.com
Page 12 of 14
8. Pin and Feature Description
8.1 OK, Fault Status
The open drain input/output with the internal pull-up
resistor. The POL converter pulls its OK pin low, if a
fault occurs. Pulling low the OK input by an external
circuitry turns off the POL converter.
8.2 SYNC, Frequency Synchronization Line
The bidirectional input/output with the internal pull-up
resistor. If the POL converter is configured as a
master, the SYNC line propagates clock to other
POL converters. If the POL converter is configured
as a slave, the internal clock recovery circuit
synchronizes the POL converter to the clock of the
SYNC line.
8.3 IM, Interleave Mode
The input with the internal pull-up resistor. When the
pin is left floating, the switching frequency is
determined by an external clock applied to the SYNC
pin. Pulling the IM pin low configures a POL
converter as a master. The master determines the
clock on the SYNC line.
8.4 PG, Power Good
The open drain input/output with the internal pull-up
resistor. The pin is pulled low by the POL converter,
if the output voltage is outside of the window defined
by the Power Good High and Low thresholds.
8.5 CCA, Compensation Coefficient Address
Inputs with internal pull-ups to select one of 2 sets of
digital filter coefficients optimized for different
characteristics of output capacitance.
8.6 CS, Current Share/Sense Bus
The open drain digital input/output with the internal
pull-up resistor. The duty cycle of the digital signal is
proportional to the output current of the POL
converter. External capacitive loading of the pin
shall be avoided.
8.7 MARGIN, Output Voltage Margining
The output of the 2V internal voltage reference that
is used to program the output voltage of the POL
converter.
8.8 TRIM, Output Voltage Trim
The input of the TRIM comparator for the output
voltage programming.
The output voltage is programmed by a single
resistor connected between MARGIN and TRIM
pins.
8.9 EN, Enable
The input with the internal pull-up resistor. The POL
converter is turned off, when the pin is pulled low
8.10 –VS and +VS
The differential voltage input of the POL converter
feedback loop.