ADP3208DJCPZ-RL ON Semiconductor, ADP3208DJCPZ-RL Datasheet - Page 33

• Manufacturer Part Number: ADP3208DJCPZ-RL
• Description: IC CTLR BUCK 7BIT 2PHASE 48LFCSP
• Manufacturer: ON Semiconductor

Specifications of ADP3208DJCPZ-RL

• Applications: Controller, Power Supplies for Next-Generation Intel Processors
• Voltage - Input: 3.3 ~ 22 V
• Number Of Outputs: 1
• Voltage - Output: 0.01 ~ 1.5 V
• Operating Temperature: -10°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 48-LFCSP
• Output Voltage: 10 mV
• Output Current: 40 A
• Input Voltage: 19 V
• Supply Current: 6 mA
• Switching Frequency: 300 KHz
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 100 C
• Minimum Operating Temperature: - 10 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Selecting Thermal Monitor Components
R
alarm temperature. For example, if the alarm temperature
for
(NTHS−0603N011003J) with a resistance of 100 kW at
25°C, or 6.8 kW at 100°C, is used, the user can set R
equal to 6.8 kW (the R
use the configuration shown in Figure 46. If any of the
monitored hot spots reaches the alarm temperature, the
VRTT signal is asserted. The following calculation sets the
alarm temperature:
where V
drop voltage is very low, that is, less than 100 mV. Assuming
the same conditions used for the single−point thermal
monitoring example, that is, an alarm temperature of 100°C
and use of an NTHS−0603N011003J Vishay thermistor;
solving Equation 43 gives a R
closest standard resistor is 7.32 kW (1%).
alarm temperature of each hot spot can be individually set by
using different values for R
ADP3208D
VRTT
TTSET1
To monitor the temperature of a single−point hot spot, set
To monitor the temperature of multiple−point hot spots,
Because the forward current is very small, the forward
The number of hot spots monitored is not limited. The
R
Figure 46. Multiple−Point Thermal Monitoring
TTSET1
VRTT
Figure 45. Single−Point Thermal Monitoring
+
-
FD
equal to the NTC thermistor’s resistance at the
VRTT
ADP3208D
is the forward drop voltage of the parallel diode.
+
R
R
TTSN
is
VCC
1
2
1
2
)
*
V
V
31
30
100°C
-
+
V
V
REF
REF
FD
FD
C
TH1
TT
R
R
R
TH1ALARMTEMPERATURE
TTSN
at 100°C).
VCC
5.0 V
TTSET1
and
31
30
TTSET
R
R
, R
C
TTSET1
a
TH1
TT
TTSET2
of 7.37 kW, and the
Vishey
R
R
R
5.0 V
R
TTSET2
, ... R
TTSET1
TH
TH2
thermistor
TTSETn
(eq. 43)
TTSET1
R
http://onsemi.com
R
TTSET3
TH3
.
33
Tuning Procedure for ADP3208D
Set Up and Test the Circuit
Set the DC Load Line
Set the AC Load Line
1. Build a circuit based on the compensation values
2. Connect a dc load to the circuit.
3. Turn on the ADP3208D and verify that it operates
4. Check for jitter with no load and full load
1. Measure the output voltage with no load (V
2. Measure the output voltage with a full load when
3. Repeat Step 2 until no adjustment of R
4. Compare the output voltage with no load to that
5. If the difference between R
6. Repeat Steps 4 and 5 until no adjustment of R
7. Measure the output ripple with no load and with a
1. Remove the dc load from the circuit and connect a
2. Connect the scope to the output voltage and set it
3. Set the dynamic load for a transient step of about
4. Measure the output waveform (note that use of a
R
R
computed from the design spreadsheet.
properly.
conditions.
and verify that this voltage is within the specified
tolerance range.
the device is cold (V
run for ~10 minutes with a full load and then
measure the output when the device is hot
(V
measured voltages is more than a few millivolts,
adjust R
CS2(NEW)
with a full load using 5 A steps. Compute the load
line slope for each change and then find the
average to determine the overall load line slope
(R
than 0.05 mW, use the following equation to adjust
the R
needed. Once this is achieved, do not change R
R
full load with scope, making sure both are within
the specifications.
dynamic load.
to dc coupling mode with a time scale of
100 ms/div.
40 A at 1 kHz with 50% duty cycle.
dc offset on the scope may be necessary to see the
waveform). Try to use a vertical scale of
100 mV/div or finer.
PH(NEW)
CS1
OMEAS
FLHOT
, R
PH
CS2
CS2
+ R
values:
). If the difference between the two
+ R
).
, or R
using Equation 44.
PH(OLD)
CS2(OLD)
TH
for the rest of the procedure.
FLCOLD
R
V
OMEAS
V
R
NL
NL
O
OMEAS
* V
). Allow the board to
* V
FLCOLD
FLHOT
and R
CS2
O
is needed.
is more
(eq. 44)
(eq. 45)
NL
PH
)
PH
is
,