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NCP1377BDR2G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
© Semiconductor Components Industries, LLC, 2015
October, 2015 − Rev. 13
1 Publication Order Number:
NCP1377/D
NCP1377, NCP1377B
PWM Current-Mode
Controller for Free-Running
Quasi-Resonant Operation
The NCP1377 combines a true current mode modulator and a
demagnetization detector which ensures full borderline/critical
Conduction Mode in any load/line conditions together with
minimum drain voltage switching (Quasi−Resonant operation). Due
to its inherent skip cycle capability, the controller enters burst mode
as soon as the power demand falls below a predetermined level. As
this happens at low peak current, no audible noise can be heard. For
NCP1377, an internal 8.0 ms timer prevents the free−run frequency to
exceed 100 kHz (therefore below the 150 kHz CISPR−22 EMI
starting limit), while the skip adjustment capability lets the user
select the frequency at which the burst foldback takes place. For
NC1377B, the internal timer duration is reduced to 3.0 ms to allow
operation at higher frequencies (up to 300 kHz).
The transformer core reset detection is done through an auxiliary
winding which, brought via a dedicated pin, also enables fast
Over Voltage Protection (OVP). Once an OVP has been detected, the
IC permanently latches off. The 1377 features a sampling time of
4.5 ms whereas it is 1.5 ms for the B version.
The NCP1377 also features an efficient protective circuitries
which, in presence of an overcurrent condition, disables the output
pulses and enters a safe burst mode, trying to restart. Once the default
has gone, the device auto−recovers. Finally an internal 1.0 ms
Soft−Start eliminates the traditional startup stress.
Features
• Free−Running Borderline/Critical Mode Quasi−Resonant Operation
• Latched Overvoltage Protection
• Auto−Recovery Short−Circuit Protection Via UVLO Crossover
• External Latch Triggering, e.g. Via Overtemperature Signal
• Current−Mode with Adjustable Skip Cycle Capability
• Internal 1.0 ms Soft−Start
• Internal Temperature Shutdown
• Internal Leading Edge Blanking
• 500 mA Peak Current Source/Sink Capability
• Under Voltage Lockout Level of 12.5 V (On) and 7.5 V (Min)
• Direct Optocoupler Connection
• SPICE Models Available for TRANsient Analysis
• Internal Minimum T
OFF
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
• AC−DC Adapters for Notebooks, etc.
• Offline Battery Chargers
• Consumer Electronics (DVD Players, Set−Top Boxes, TVs, etc.)
• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
SOIC−7
D1 SUFFIX
CASE 751U
1
8
SOIC−8
DR SUFFIX
CASE 751
PIN CONNECTIONS
MARKING DIAGRAMS
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = Pb−Free Package
1
8
1
8
PDIP−7
P SUFFIX
CASE 626B
1
Dmg
8
HV
2
FB
3
CS
4
GND
6
V
CC
5
Drv
(Top View)
1377P
AWL
YYWWG
1
1377BP
AWL
YYWWG
1
www.onsemi.com
377D1
ALYW G
G
1
8
See detailed ordering and shipping information in the packag
e
dimensions section on page 14 of this data sheet.
ORDERING INFORMATION
1377
ALYW
G
1
8
1377B
ALYW
G
1
8
(Note: Microdot may be in either location)
NCP1377, NCP1377B
www.onsemi.com
2
Figure 1. Typical Application Schematic
1 8
2
3
4
6
5
7
NCP1377
OVP and
Demag
+
Universal
Network
R*
+
12 V @ 1 A
GND
+
Y1 Type
*Please refer to the application information section.
PIN FUNCTION DESCRIPTION
Pin Symbol Function Description
1 Demag Core reset detection and OVP The auxiliary FLYBACK signal ensures discontinuous operation and offers a fixed
overvoltage detection level of 7.2 V.
2 FB Sets the peak current setpoint By connecting an optocoupler to this pin, the peak current setpoint is adjusted
accordingly to the output power demand. By bringing this pin below the internal
skip level, you shut off the device.
3 CS Current sense input and skip
cycle level selection
This pin senses the primary current and routes it to the internal comparator via an
L.E.B. By inserting a resistor in series with the pin, you control the level at which
the skip operation takes place.
4 GND The IC ground −
5 Drv Driving pulses The driver’s output to an external MOSFET.
6 V
CC
Supplies the IC This pin is connected to an external bulk capacitor of typically 10 mF.
7
NC
− This unconnected pin ensures adequate creepage distance.
8 HV High−voltage pin Connected to the high−voltage rail, this pin injects a constant current into the V
CC
bulk capacitor and ensures a clean lossless startup sequence.
NCP1377, NCP1377B
www.onsemi.com
3
Figure 2. Internal Circuit Architecture
HV
V
CC
GND
Dema
g
4 mA
To Internal
Supply
+
+
12.5 V
7.5 V
5.6 V (Fault)
Fault
Mngt.
PON
5 V
+
OVP
+
/1.44
4.5 us
Delay
1.5 us for B Version
Demag
8 us
Blanking
S
S
R
R
Q
Q
+
3 us for
B Version
+
-
Overload?
5 us
Timeout
Time
Reset
Demag
380 ns
LEB
1 V
/3
200 mA
when DRV
is OFF
FB
4.2 V
Driver src = 20 sink = 10
Drv
V
CC
CS
+
50 mV
10 V Rint
MAXIMUM RATINGS
Rating Symbol Value Unit
Continuous Power Supply or Drive Voltage V
CC
, Drv 18 V
Transient Power Supply Voltage, Duration < 10 ms, I
VCC
< 20 mA V
CC
Pulse 25 V
Maximum Voltage on all other pins except Pin 8 (HV), Pin 6 (V
CC
) and Pin 5 (Drv) − −0.3 to 10 V
Maximum Current into all pins except V
CC
(6), HV (8) and Demag (1) when 10 V ESD di-
odes are activated
− 5.0 mA
Maximum Current in Pin 1 Idem +3.0/−2.0 mA
Thermal Resistance, Junction−to−Case R
q
JC
57 °C/W
Thermal Resistance, Junction−to−Air, SOIC Version R
q
JA
178 °C/W
Thermal Resistance, Junction−to−Air, PDIP Version R
q
JA
100 °C/W
Maximum Junction Temperature TJ
MAX
150 °C
Temperature Shutdown − 155 °C
Hysteresis in Shutdown − 30 °C
Storage Temperature Range − −60 to +150 °C
ESD Capability, HBM Model (All pins except V
CC
and HV) − 2.0 kV
ESD Capability, Machine Model − 200 V
Maximum Voltage on Pin 8 (HV), Pin 6 (V
CC
) Decoupled to Ground with 10 mF V
HV
500 V
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

NCP1377BDR2G

Mfr. #:
Buy NCP1377BDR2G
Manufacturer:
ON Semiconductor
Description:
Switching Controllers Quasi Resonant Current Mode PWM
Lifecycle:
New from this manufacturer.
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