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NCV887001D1R2G Datasheet(PDF) 8 Page - ON Semiconductor

Part # NCV887001D1R2G
Description  Automotive Grade Non-Synchronous Boost Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCV887001D1R2G Datasheet(HTML) 8 Page - ON Semiconductor

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NCV8870
www.onsemi.com
8
Current Limit
The NCV8870 features two current limit protections,
peak current mode and over current latch off. When the
current sense amplifier detects a voltage above the peak
current limit between ISNS and GND after the current limit
leading edge blanking time, the peak current limit causes the
power switch to turn off for the remainder of the cycle. Set
the current limit with a resistor from ISNS to GND, with
R=VCL /Ilimit.
If the voltage across the current sense resistor exceeds the
over current threshold voltage the device enters over current
hiccup mode. The device will remain off for the hiccup time
and then go through the soft−start procedure.
Short Circuit Protection
If the short circuit enable bit is set (SCE = Y) the device
will attempt to protect the power MOSFET from damage.
When the output voltage falls below the short circuit trip
voltage, after the initial short circuit blanking time, the
device enters short circuit latch off. The device will remain
off for the hiccup time and then go through the soft-start.
EN/SYNC
The Enable/Synchronization pin has three modes. When
a dc logic high (CMOS/TTL compatible) voltage is applied
to this pin the NCV8870 operates at the programmed
frequency. When a dc logic low voltage is applied to this pin
the NCV8870 enters a low quiescent current sleep mode.
When a square wave of at least %fsync,min of the free running
switching frequency is applied to this pin, the switcher
operates at the same frequency as the square wave. If the
signal is slower than this, it will be interpreted as enabling
and disabling the part. The falling edge of the square wave
corresponds to the start of the switching cycle. If device is
disabled, it must be disabled for 7 clock cycles before being
re-enabled.
If the VIN pin voltage falls below VUVLO when
EN/SYNC pin is at logic−high, the IC may not power up
when VIN returns back above the UVLO. To resume a
normal operating state, the EN/SYNC pin must be cycled
with a single logic−low to logic−high transition.
UVLO
Input Undervoltage Lockout (UVLO) is provided to
ensure that unexpected behavior does not occur when VIN
is too low to support the internal rails and power the
controller. The IC will start up when enabled and VIN
surpasses the UVLO threshold plus the UVLO hysteresis
and will shut down when VIN drops below the UVLO
threshold or the part is disabled.
To avoid any lock state under UVLO conditions, the
EN/SYNC pin should be in logic−low state. For further
details, please refer to EN/SYNC paragraph.
Internal Soft-Start
To insure moderate inrush current and reduce output
overshoot, the NCV8870 features a soft start which charges a
capacitor with a fixed current to ramp up the reference voltage.
This fixed current is based on the switching frequency, so
that if the NCV8870 is synchronized to twice the default
switching frequency the soft start will last half as long.
VDRV
An internal regulator provides the drive voltage for the
gate driver. Bypass with a ceramic capacitor to ground to
ensure fast turn on times. The capacitor should be between
0.1
mF and 1 mF, depending on switching speed and charge
requirements of the external MOSFET.
GDRV
An RGND = 15 k
W (typical) GDRV−GND resistor is
strongly recommended.
APPLICATION INFORMATION
Design Methodology
This section details an overview of the component selection
process for the NCV8870 in continuous conduction mode
boost. It is intended to assist with the design process but does
not remove all engineering design work. Many of the
equations make heavy use of the small ripple approximation.
This process entails the following steps:
1. Define Operational Parameters
2. Select Current Sense Resistor
3. Select Output Inductor
4. Select Output Capacitors
5. Select Input Capacitors
6. Select Feedback Resistors
7. Select Compensator Components
8. Select MOSFET(s)
9. Select Diode
10. Determine Feedback Loop Compensation Network
1. Define Operational Parameters
Before beginning the design, define the operating
parameters of the application. These include:
VIN(min): minimum input voltage [V]
VIN(max): maximum input voltage [V]
VOUT: output voltage [V]
IOUT(max): maximum output current [A]
ICL: desired typical cycle-by-cycle current limit [A]
From this the ideal minimum and maximum duty cycles
can be calculated as follows:
D
min + 1 *
V
IN(max)
V
OUT
Dmax + 1 *
V
IN(min)
V
OUT


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