NCP1622
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19
Failure Detection
When manufacturing a power supply, elements can be
accidentally shorted or improperly soldered. Such failures
can also happen to occur later on because of the components
fatigue or excessive stress, soldering defaults or external
interactions. In particular, adjacent pins of controllers can be
shorted; a pin can be grounded or badly connected. Such
open/short situations are generally required not to cause fire,
smoke nor big noise. NCP1622 integrate functions that ease
meet this requirement. Among them, we can list:
Floating feedback pin
A special internal circuitry detects the floating feedback
pin and stops the operation of the IC.
Fault of the GND connection
If the GND pin is not connected, internal circuitry
detects it and if such a fault is detected for 200 ms, the
circuit stops operating.
Detection the CS/ZCD pin improper connection
If the CS/ZCD pin is floating or shorted to GND it is
detected by internal circuitry and the circuit stops
operating.
Boost or bypass diode short
The controller addresses the short situations of the
boost and bypass diodes (a bypass diode is generally
placed between the input and output high−voltage rails
to divert this inrush current). Practically, the overstress
protection is implemented to detect such conditions and
forces a low duty−cycle operation until the fault is gone.
Refer to application note ANDxxxx for more details.
NCP1622
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20
PACKAGE DIMENSIONS
TSOP−6
CASE 318G−02
ISSUE V
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
STYLE 13:
PIN 1. GATE 1
2. SOURCE 2
3. GATE 2
4. DRAIN 2
5. SOURCE 1
6. DRAIN 1
RECOMMENDED
0.60
6X
3.20
0.95
6X
0.95
PITCH
DIMENSIONS: MILLIMETERS
23
456
D
1
e
b
E1
A1
A
0.05
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH. MINIMUM
LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL.
4. DIMENSIONS D AND E1 DO NOT INCLUDE MOLD FLASH,
PROTRUSIONS, OR GATE BURRS. MOLD FLASH, PROTRUSIONS, OR
GATE BURRS SHALL NOT EXCEED 0.15 PER SIDE. DIMENSIONS D
AND E1 ARE DETERMINED AT DATUM H.
5. PIN ONE INDICATOR MUST BE LOCATED IN THE INDICATED ZONE.
c
DIM
A
MIN NOM MAX
MILLIMETERS
0.90 1.00 1.10
A1 0.01 0.06 0.10
b 0.25 0.38 0.50
c 0.10 0.18 0.26
D 2.90 3.00 3.10
E 2.50 2.75 3.00
e 0.85 0.95 1.05
L 0.20 0.40 0.60
0.25 BSC
L2
0° 10°
1.30 1.50 1.70
E1
E
NOTE 5
L
C
M
H
L2
SEATING
PLANE
GAUGE
PLANE
DETAIL Z
DETAIL Z
M
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NCP1622/D
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NCP1622BECSNT1G

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
Power Factor Correction - PFC ENHANCED EFFICIENCY
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