NCP1379DR2G ON Semiconductor, NCP1379DR2G Datasheet - Page 18

• Manufacturer Part Number: NCP1379DR2G
• Description: IC CTLR QUASI CURRENT MODE 8SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1379DR2G

• Output Isolation: Isolated
• Voltage - Input: 9 ~ 28 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Duty Cycle (max): 6.7 %
• Mounting Style: SMD/SMT
• Switching Frequency: 65 KHz
• Operating Supply Voltage: 8.3 V to 12.3 V
• Supply Current: 1.7 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

/R
starts counting: the timer count is incremented each 10 ms.
When the current comes back within safe limits, “Max Ip”
comparator becomes silent and the timer count down: the
timer count is decremented each 10 ms. In normal overload
conditions the timer reaches its completion when it has
counted up 8 times 10 ms.
Laux
Figure 33 shows the implementation of the fault timer.
When the current in the MOSFET is higher than V
sense
ZCD/OPP
R sen se
, “Max Ip” comparator trips and the digital timer
CS
LEB1
LEB2
V IL IM IT
FB/4
OPP
V CS(stop)
Soft−start
SHORT−CIRCUIT OR OVERLOAD MODE
+
−
+
−
+
−
Figure 33. Fault Detection Schematic
Soft −s t art end ?
t hen 1
else 0
PW Mr eset
IpFlag
http://onsemi.com
SS en d
CsStop
ILIM
R
18
S
Q
Q
grand
reset
auto−recovery mode: the circuit stops all operations during
1.2 s typically and re−start. This ensures a low duty−cycle
burst operation in fault mode (around 6.7%).
another comparator with a reduced LEB (t
threshold of 1.2 V is able to sense winding short−circuit and
immediately stop the controller. This additional protection
is also auto−recovery.
Down
Up
When the timers reaches its completion, the circuit enter
In parallel to the cycle−by−cycle sensing of the CS pin,
TIMER
CsStop
VC C sto p
Reset
DRV
latch
fau l t
management
VDD
grand
reset
V
CC
VCCstop
BCS
) and a
Vcc
au x