NCP1397ADR2G ON Semiconductor, NCP1397ADR2G Datasheet - Page 22

• Manufacturer Part Number: NCP1397ADR2G
• Description: IC CTLR RESONANT HI PERF 16-SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1397ADR2G

• Pwm Type: Controller
• Number Of Outputs: 1
• Frequency - Max: 560kHz
• Duty Cycle: 52%
• Voltage - Supply: 10.3 V ~ 20 V
• Buck: No
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-SOIC (3.9mm Width, 15 Leads)
• Frequency-max: 560kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

primary current, once averaged, gives an image of the input
power in case V
output loading increases above a certain level, the voltage on
this pin will pass the 1 V threshold and start the timer. If the
UVLO
On Figures 43 and 44 examples, a voltage proportional to
Reset
in
+
Reset
VtimerOFF
VtimerON
is kept constant via a PFC circuit. If the
Itimer1
DRIVING
LOGIC
+ -
VDD
1 = ok
0 = fault
SS
Figure 44. Fault Input Logic for NCP1397B
Vref(skip)
-
+
0 = fault
+
1 = ok
http://onsemi.com
discharge at VCC(on)/
restart if VFB < 0.3 V
22
Vref(fault)
to latch
overload stays there, after a few tens of milli −seconds,
switching pulses will disappear and a protective
auto−recovery cycle will take place. Adjusting the resistor
R in parallel with the timer capacitor will give the flexibility
to adjust the fault burst mode (refer to Figure 45).
-
+
Vref(OCP)
+
FB
+
-
Skip/Disable
+
Ctimer
A
B
SS(dis)
Fault
A
B
FB
Ctimer
Rtimer
Css
VCC
Skip
Average
Current
To Primary
Current Sensing
Circuitry
Input