NCP1236BD65R2G ON Semiconductor, NCP1236BD65R2G Datasheet - Page 27

• Manufacturer Part Number: NCP1236BD65R2G
• Description: IC CTLR CURR MODE 65KHZ 7-SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1236BD65R2G

• Frequency - Max: 70kHz
• Pwm Type: Current Mode
• Number Of Outputs: 1
• Duty Cycle: 85%
• Voltage - Supply: 9.5 V ~ 28 V
• Buck: No
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width) 7 leads
• Duty Cycle (max): 85 %
• Output Current: 500 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 65 KHz
• Operating Supply Voltage: - 0.3 V to + 28 V
• Supply Current: +/- 30 mA
• Maximum Operating Temperature: + 125 C
• Fall Time: 40 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 40 ns
• 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)
,