NCP1236AD100R2G ON Semiconductor, NCP1236AD100R2G Datasheet - Page 27

• Manufacturer Part Number: NCP1236AD100R2G
• Description: IC CTLR CURR MODE 100KHZ 7-SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1236AD100R2G

• Input Voltage: 28V
• No. Of Outputs: 1
• Voltage Regulator Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +125°C
• Svhc: No SVHC (20-Jun-2011)
• Base Number: 1236
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Frequency Foldback
the frequency of the internal oscillator is linearly reduced
from its nominal value down to f
foldback starts when the voltage on FB pin goes below
Skip Cycle Mode
skip mode is activated: the driver stops, and the internal
consumption of the controller is decreased. While V
In order to improve the efficiency in light load conditions,
When the FB voltage reaches V
Nominal f
FB
CS
f
OSC(min)
OSC
f
OSC
Figure 47. Frequency Foldback when the FB Voltage Decreases
OSC(min)
skip(in)
blanking
Skip
t
K
LEB
FB
V
while decreasing,
. This frequency
skip(in)
Figure 48. Skip Cycle Schematic
V
LOW LOAD OPERATION
+
FB(foldE)
http://onsemi.com
V
skip
FB
+
−
+
−
V
is
FB(foldS)
27
V
whatever the nominal switching frequency option is. The
current−mode control is still active while the oscillator
frequency decreases. Note that the frequency foldback is
disabled if the controller runs at its maximum duty cycle.
below V
soon as V
starts to pulse again.
FB(foldS)
skip(out)
, and is complete before V
FB
crosses the skip out threshold, the DRV pin
, the controller remains in this state; but as
S
R
Q
DRV stage
FB
reaches V
FB
skip(in)
,