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NCP3218AMNR2G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P35
ADP3212A, NCP3218A
http://onsemi.com
19
Figure 26. Inductor Current and Switch Node in DCM
Inductor
Current
Switch
Node
Voltage
t
0
t
1
t
2
t
3
t
4
Figure 27. Single−Phase Waveforms in DCM with 1 A
Load Current
3
1
2
4
2 μs/DIV
SWITCH NODE 5 V/DIV
LOW−SIDE GATE DRIVE 5 V/DIV
OUTPUT VOLTAGE
20 mV/DIV
INDUCTOR CURRENT
5 A/DIV
Figure 28. Single−Phase CCM/DCM Frequency vs.
Load Current
400
0
014
LOAD CURRENT (A)
FREQUENCY (kHz)
350
300
250
200
150
100
50
24681012
19 V INPUT
9 V INPUT
Output Crowbar
To prevent the CPU and other external components from
damage due to overvoltage, the APD3212A/NCP3218A
turns off the DRVH1 and DRVH2 outputs and turns on the
DRVL1 and DRVL2 outputs when the output voltage
exceeds the OVP threshold (1.55 V typical).
Turning on the low−side MOSFETs forces the output
capacitor to discharge and the current to reverse due to
current build up in the inductors. If the output overvoltage
is due to a drain−source short of the high−side MOSFET,
turning on the low−side MOSFET results in a crowbar
across the input voltage rail. The crowbar action blows the
fuse of the input rail, breaking the circuit and thus protecting
the microprocessor from destruction.
When the OVP feature is triggered, the
APD3212A/NCP3218A is latched off. The latchoff function
can be reset by removing and reapplying VCC to the
APD3212A/NCP3218A or by briefly pulling the EN pin low.
Pulling TTSNS to less than 1.0 V disables the overvoltage
protection function. In this configuration, VRTT should be
tied to ground.
Reverse Voltage Protection
Very large reverse current in inductors can cause negative
V
CORE
voltage, which is harmful to the CPU and other
output components. The APD3212A/NCP3218A provides
a Reverse Voltage Protection (RVP) function without
additional system cost. The V
CORE
voltage is monitored
through the CSREF pin. When the CSREF pin voltage drops
to less than −300 mV, the APD3212A/NCP3218A triggers
the RVP function by disabling all PWM outputs and driving
DRVL1 and DRVL2 low, thus turning off all MOSFETs. The
reverse inductor currents can be quickly reset to 0 by
discharging the built−up energy in the inductor into the input
dc voltage source via the forward−biased body diode of the
high−side MOSFETs. The RVP function is terminated when
the CSREF pin voltage returns to greater than −100 mV.
Sometimes the crowbar feature inadvertently causes
output reverse voltage because turning on the low−side
MOSFETs results in a very large reverse inductor current. To
prevent damage to the CPU caused from negative voltage,
the APD3212A/NCP3218A maintains its RVP monitoring
function even after OVP latchoff. During OVP latchoff, if
the CSREF pin voltage drops to less than −300 mV, the
low−side MOSFETs is turned off. DRVL outputs are
allowed to turn back on when the CSREF voltage recovers
to greater than −100 mV.
Output Enable and UVLO
For the APD3212A/NCP3218A to begin switching, the
VCC supply voltage to the controller must be greater than
the V
CCOK
threshold and the EN pin must be driven high. If
the VCC voltage is less than the V
CCUVLO
threshold or the
EN pin is a logic low, the APD3212A/NCP3218A shuts off.
In shutdown mode, the controller holds the PWM outputs
low, shorts the capacitors of the SS and PGDELAY pins to
ground, and drives the DRVH and DRVL outputs low.
ADP3212A, NCP3218A
http://onsemi.com
20
The user must adhere to proper power−supply sequencing
during startup and shutdown of the APD3212A/
NCP3218A. All input pins must be at ground prior to
removing or applying VCC, and all output pins should be
left in high impedance state while VCC is off.
Thermal Throttling Control
The APD3212A/NCP3218A includes a thermal
monitoring circuit to detect whether the temperature of the
VR has exceeded a user−defined thermal throttling
threshold. The thermal monitoring circuit requires an
external resistor divider connected between the VCC pin
and GND. The divider consists of an NTC thermistor and a
resistor. To generate a voltage that is proportional to
temperature, the midpoint of the divider is connected to the
TTSNS pin. An internal comparator circuit compares the
TTSNS voltage to half the VCC threshold and outputs a
logic level signal at the VRTT output when the temperature
trips the user−set alarm threshold. The VRTT output is
designed to drive an external transistor that in turn provides
the high current, open−drain VRTT signal required by the
IMVP−6.5 specification. The internal VRTT comparator
has a hysteresis of approximately 100 mV to prevent high
frequency oscillation of VRTT when the temperature
approaches the set alarm point.
Output Current Monitor
The APD3212A/NCP3218A has an output current
monitor. The IMON pin sources a current proportional to the
inductor current. A resistor from IMON pin to FBRTN sets
the gain. A 0.1 mF is added in parallel with R
MON
to filter the
inductor ripple. The IMON pin is clamped to prevent it from
going above 1.15 V.
Table 3. VID CODE TABLE
VID6 VID5 VID4 VID3 VID2 VID1 VID0 Output (V)
0 0 0 0 0 0 0 1.5000 V
0 0 0 0 0 0 0 1.5000 V
0 0 0 0 0 0 1 1.4875 V
0 0 0 0 0 1 0 1.4750 V
0 0 0 0 0 1 1 1.4625 V
0 0 0 0 1 0 0 1.4500 V
0 0 0 0 1 0 1 1.4375 V
0 0 0 0 1 1 0 1.4250 V
0 0 0 0 1 1 1 1.4125 V
0 0 0 1 0 0 0 1.4000 V
0 0 0 1 0 0 1 1.3875 V
0 0 0 1 0 1 0 1.3750 V
0 0 0 1 0 1 1 1.3625 V
0 0 0 1 1 0 0 1.3500 V
0 0 0 1 1 0 1 1.3375 V
0 0 0 1 1 1 0 1.3250 V
0 0 0 1 1 1 1 1.3125 V
0 0 1 0 0 0 0 1.3000 V
0 0 1 0 0 0 1 1.2875 V
0 0 1 0 0 1 0 1.2750 V
0 0 1 0 0 1 1 1.2625 V
0 0 1 0 1 0 0 1.2500 V
0 0 1 0 1 0 1 1.2375 V
0 0 1 0 1 1 0 1.2250 V
0 0 1 0 1 1 1 1.2125 V
0 0 1 1 0 0 0 1.2000 V
0 0 1 1 0 0 1 1.1875 V
0 0 1 1 0 1 0 1.1750 V
0 0 1 1 0 1 1 1.1625 V
0 0 1 1 1 0 0 1.1500 V
0 0 1 1 1 0 1 1.1375 V
0 0 1 1 1 1 0 1.1250 V
0 0 1 1 1 1 1 1.1125 V
ADP3212A, NCP3218A
http://onsemi.com
21
Table 3. VID CODE TABLE (continued)
VID6 Output (V)VID0VID1VID2VID3VID4VID5
0 1 0 0 0 0 0 1.1000 V
0 1 0 0 0 0 1 1.0875 V
0 1 0 0 0 1 0 1.0750 V
0 1 0 0 0 1 1 1.0625 V
0 1 0 0 1 0 0 1.0500 V
0 1 0 0 1 0 1 1.0375 V
0 1 0 0 1 1 0 1.0250 V
0 1 0 0 1 1 1 1.0125 V
0 1 0 1 0 0 0 1.0000 V
0 1 0 1 0 0 1 0.9875 V
0 1 0 1 0 1 0 0.9750 V
0 1 0 1 0 1 1 0.9625 V
0 1 0 1 1 0 0 0.9500 V
0 1 0 1 1 0 1 0.9375 V
0 1 0 1 1 1 0 0.9250 V
0 1 0 1 1 1 1 0.9125 V
0 1 1 0 0 0 0 0.9000 V
0 1 1 0 0 0 1 0.8875 V
0 1 1 0 0 1 0 0.8750 V
0 1 1 0 0 1 1 0.8625 V
0 1 1 0 1 0 0 0.8500 V
0 1 1 0 1 0 1 0.8375 V
0 1 1 0 1 1 0 0.8250 V
0 1 1 0 1 1 1 0.8125 V
0 1 1 1 0 0 0 0.8000 V
0 1 1 1 0 0 1 0.7875 V
0 1 1 1 0 1 0 0.7750 V
0 1 1 1 0 1 1 0.7625 V
0 1 1 1 1 0 0 0.7500 V
0 1 1 1 1 0 1 0.7375 V
0 1 1 1 1 1 0 0.7250 V
0 1 1 1 1 1 1 0.7125 V
1 0 0 0 0 0 0 0.7000 V
1 0 0 0 0 0 1 0.6875 V
1 0 0 0 0 1 0 0.6750 V
1 0 0 0 0 1 1 0.6625 V
1 0 0 0 1 0 0 0.6500 V
1 0 0 0 1 0 1 0.6375 V
1 0 0 0 1 1 0 0.6250 V
1 0 0 0 1 1 1 0.6125 V
1 0 0 1 0 0 0 0.6000 V
1 0 0 1 0 0 1 0.5875 V
1 0 0 1 0 1 0 0.5750 V
1 0 0 1 0 1 1 0.5625 V
1 0 0 1 1 0 0 0.5500 V
1 0 0 1 1 0 1 0.5375 V
1 0 0 1 1 1 0 0.5250 V
1 0 0 1 1 1 1 0.5125 V
1 0 1 0 0 0 0 0.5000 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P35

NCP3218AMNR2G

Mfr. #:
Buy NCP3218AMNR2G
Manufacturer:
ON Semiconductor
Description:
Switching Controllers 3 PHASE BUCK CONTROLLER
Lifecycle:
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