NCP1377, NCP1377B
www.onsemi.com
13
1
st
Upper Plot: Free run, valley switching operation, Pout = 26 W.
2
nd
Middle Plot: Min Toff clamps the switching frequency and selects
the second valley.
3
rd
Lowest Plot: The skip slices the second valley pattern and will
further expand the burst as Pout goes low.
Figure 29. This plot gathers waveforms captured at three different operating points:
Figure 30. This picture explains how the 200 mA internal offset
current creates the skip cycle level.
Vrsense (200 mV/div)
Vgate (5 V/div)
200 mA x Rskip
Current Sense Pin (200 mV/pin)
NCP1377, NCP1377B
www.onsemi.com
14
Figure 31. The short−circuit protection forces the IC to enter burst
in presence of a secondary overload.
Vcc (5 V/div)
Latchoff Level
Vgate (5 V/div)
ORDERING INFORMATION
Device Package Type Shipping
NCP1377DR2G SOIC−8
(Pb−Free)
2500 / Tape & Reel
NCP1377BDR2G SOIC−8
(Pb−Free)
2500 / Tape & Reel
NCP1377D1R2G SOIC−7
(Pb−Free)
2500 / Tape & Reel
NCP1377BD1R2G SOIC−7
(Pb−Free)
2500 / Tape & Reel
NCP1377PG PDIP−7
(Pb−Free)
50 Units / Rail
NCP1377BPG PDIP−7
(Pb−Free)
50 Units / Rail
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
NCP1377, NCP1377B
www.onsemi.com
15
PACKAGE DIMENSIONS
PDIP−7 (PDIP−8 LESS PIN 7)
P SUFFIX
CASE 626B
ISSUE D
14
58
b2
NOTE 8
D
b
L
A1
A
eB
E
A
TOP VIEW
C
SEATING
PLANE
0.010 CA
SIDE VIEW
END VIEW
END VIEW
WITH LEADS CONSTRAINED
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: INCHES.
3. DIMENSIONS A, A1 AND L ARE MEASURED WITH THE PACK-
AGE SEATED IN JEDEC SEATING PLANE GAUGE GS−3.
4. DIMENSIONS D, D1 AND E1 DO NOT INCLUDE MOLD FLASH
OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS ARE NOT
TO EXCEED 0.10 INCH.
5. DIMENSION E IS MEASURED AT A POINT 0.015 BELOW DATUM
PLANE H WITH THE LEADS CONSTRAINED PERPENDICULAR
TO DATUM C.
6. DIMENSION eB IS MEASURED AT THE LEAD TIPS WITH THE
LEADS UNCONSTRAINED.
7. DATUM PLANE H IS COINCIDENT WITH THE BOTTOM OF THE
LEADS, WHERE THE LEADS EXIT THE BODY.
8. PACKAGE CONTOUR IS OPTIONAL (ROUNDED OR SQUARE
CORNERS).
E1
M
8X
c
D1
B
H
NOTE 5
e
e/2
A2
NOTE 3
M
B
M
NOTE 6
M
DIM MIN MAX
INCHES
A −−−− 0.210
A1 0.015 −−−−
b 0.014 0.022
C 0.008 0.014
D 0.355 0.400
D1 0.005 −−−−
e 0.100 BSC
E 0.300 0.325
M −−−− 10
−− 5.33
0.38 −−
0.35 0.56
0.20 0.36
9.02 10.16
0.13 −−
2.54 BSC
7.62 8.26
−−− 10
MIN MAX
MILLIMETERS
E1 0.240 0.280 6.10 7.11
b2
eB −−−− 0.430 −− 10.92
0.060 TYP 1.52 TYP
A2 0.115 0.195 2.92 4.95
L 0.115 0.150 2.92 3.81
°°

NCP1377BDR2G

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
Switching Controllers Quasi Resonant Current Mode PWM
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union