NCP1380ADR2G ON Semiconductor, NCP1380ADR2G Datasheet - Page 24

• Manufacturer Part Number: NCP1380ADR2G
• Description: IC PWM FLYBCK ISO CM 8SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1380ADR2G

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 65kHz
• Voltage - Supply: 9.4 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 (3.9mm Width)
• Frequency-max: 65kHz
• Mounting Style: SMD/SMT
• Operating Supply Voltage: - 0.3 V to + 28 V
• Supply Current: +/- 30 mA
• Maximum Operating Temperature: + 125 C
• Fall Time: 25 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 40 ns
• Synchronous Pin: No
• Topology: Quasi-Resonant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Duty Cycle: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

and overvoltage detection on pin 7.
voltage condition, the pin 7 permanently monitors a fraction
of the bulk voltage through a voltage divider. When this
image of bulk voltage is below the V
controller stops switching. When the bulk voltage comes
back within safe limits, the circuit will restart pulsing only
bulk voltage is high, an internal clamp limits the voltage.
conduct and inject current inside the internal clamp resistor
The C and D versions of NCP1380 combine brown−out
In order to protect the power supply against low input
In order to avoid having a too high voltage on pin 7 if the
In case of overvoltage, the zener diode will start to
HV−Bulk
Rbou
Rbol
VCC
Dz
OVP/BO
7
OVERVOLTAGE PROTECTION / BROWN−OUT (C AND D VERSIONS)
Vclamp
Rc l a mp
VOVP
VDD
Figure 43. Brown−out and Overvoltage Protection
IBO
Figure 44. Brown−out Operating Chronograms
VBO
+
−
−
BO
+
threshold, the
http://onsemi.com
noi s e de l a y
noi s e de l a y
24
when V
startup sequence with soft−start. The hysteresis for the
brown−out function is implemented with a high side current
source sinking 10 mA when the brown−out comparator is
high (V
R
voltage reaches V
latched until the user cycles down the power supply
(Figure 45).
clamp
gr a nd
BO reset
reset
thus causing pin 7 voltage to increase. When this
CC
bulk
reaches V
> V
bulk(on)
R
S
OVP
Q
Q
CC(on)
, the controller latches−off and stays
)
(Figure 44): this ensures a clean
La tc h
CS c omp
S
R
Q
Q
DRV