NCP1236AD65R2G ON Semiconductor, NCP1236AD65R2G Datasheet - Page 18

• Manufacturer Part Number: NCP1236AD65R2G
• Description: IC CTLR CURR MODE 65KHZ 7-SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1236AD65R2G

• 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

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