NCP1236AD100R2G ON Semiconductor, NCP1236AD100R2G Datasheet - Page 18

• 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

Oscillator with Maximum Duty Cycle and Frequency
Jittering
switching frequency with an accuracy of $7%. Two
frequency options can be ordered: 65 kHz and 100 kHz. The
maximum duty cycle of the DRV pin is 80%, with an
accuracy of $7%.
frequency jitters $6% around its nominal value, with a
triangle−wave shape and at a frequency of 125 Hz. This
frequency jittering is active even when the frequency is
decreased to improve the EMI in light load condition.
V
V
Nominal f
HV(start)
HV(stop)
The NCP1236 includes an oscillator that sets the
In order to improve the EMI signature, the switching
DRV
V
f
f
OSC
OSC
HV
OSC
+ 6
f
− 6
OSC
Figure 34. Frequency Jittering
Starts at next
V
CC(ON)
(125 Hz)
8%
Figure 33. AC Input Brown−out Timing Diagram
Time
http://onsemi.com
18
Clamped Driver
28 V, but most of the MOSFETs that will be connected to the
DRV pin cannot accept more than 20 V on their gate. The
driver pin is therefore clamped safely below 16 V. This
driver has a typical current capability of $500 mA.
The supply voltage for the NCP1236 can be as high as
DRV signal
t
HV
Figure 35. Clamped Driver
Brown-out
Clamp
VCC
DRV
time
time