NCP1217 PDF даташит
Спецификация NCP1217 изготовлена «ON Semiconductor» и имеет функцию, называемую «Enhanced PWM Current-Mode Controller». |
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Детали детали
Номер произв | NCP1217 |
Описание | Enhanced PWM Current-Mode Controller |
Производители | ON Semiconductor |
логотип |
19 Pages
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NCP1217, NCP1217A
Enhanced PWM Current-Mode
Controller for High-Power
Universal Off-Line Supplies
Housed in an SO−8 or PDIP−7 package, the NCP1217 represents
the enhanced version of the NCP1203−based controllers. Due to its
high drive capability, NCP1217 drives large gate−charge MOSFETs,
which together with internal ramp compensation and built−in
overvoltage protection, ease the design of modern AC/DC adapters.
NCP1217 offers a true alternative to UC384X−based designs.
With an internal structure operating at different fixed frequencies
(65–100–133 kHz), the controller features a high−voltage startup FET,
which ensures a clean and loss less startup sequence. Its current−mode
control topology provides an excellent input audio−susceptibility and
inherent pulse−by−pulse control. Internal ramp compensation easily
prevents subharmonic oscillations from taking place in continuous
conduction mode designs.
When the current setpoint falls below a given value, e.g. the output
power demand diminishes, the IC automatically enters the so−called
skip cycle mode and provides excellent efficiency at light loads.
Because this occurs at a user adjustable low peak current, no acoustic
noise takes place.
The NCP1217 features two efficient protective circuitries: 1) In
presence of an overcurrent condition, the output pulses are disabled
and the device enters a safe burst mode, trying to restart. Once the
default has gone, the device auto−recovers. 2) If an external signal
(e.g. a temperature sensor) pulls Pin 1 above 3.2 V, output pulses are
immediately stopped and the NCP1217 stays latched in this position.
Reset occurs when the VCC collapses to ground, e.g. the user unplugs
the power supply.
Features
• Current−Mode with Adjustable Skip−Cycle Capability
• Built−in Internal Ramp Compensation
• Auto−Recovery Internal Output Short−Circuit Protection
• Internal 1.0 ms Soft−Start (NCP1217A Only)
• Limited Duty−Cycle to 50% (NCP1217A Only)
• Full Latchoff if Adjustment Pin is Brought High
• Extremely Low No−Load Standby Power
• Internal Temperature Shutdown
• 500 mA Peak Current Capability
• Fixed Frequency Versions at 65 kHz, 100 kHz and 133 kHz
• Direct Optocoupler Connection
• Internal Leading Edge Blanking
• SPICE Models Available for TRANsient and AC Analysis
• These are Pb−Free Devices
Typical Applications
• High Power AC/DC Converters for TVs, Set−Top Boxes, etc.
• Offline Adapters for Notebooks
• Telecom DC−DC Converters
• All Power Supplies
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8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
XXXXX
ALYW
G
1
8
1
PDIP−7
P SUFFIX
CASE 626B
XXXXXXXXX
AWL
YYWWG
1
XXXXXX = Specific Device Code
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = Pb−Free Package
DEVICE MARKING INFORMATION
See detailed device marking information in the ordering
information section on page 17 of this data sheet.
PIN CONNECTIONS
Adj 1
FB 2
CS 3
GND 4
8 HV
7 NC
6 VCC
5 Drv
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering
information section on page 17 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
April, 2015 − Rev. 9
1
Publication Order Number:
NCP1217/D
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EMI
FILTER
UNIVERSAL
INPUT
NCP1217, NCP1217A
See Application
Section
+
NCP1217
1 Adj HV 8
2 FB
7
3 CS VCC 6
4 Gnd Drv 5
Aux.
Ramp Adjustment +
Figure 1. Typical Application Example
VOUT
+
PIN FUNCTION DESCRIPTION
Pin No. Pin Name
Function
1 Adj Adjust the skipping peak current
2 FB Sets the peak current setpoint
3 CS Current sense input
4
GND
The IC ground
5 Drv Driving pulses
6 VCC Supplies the IC
7 NC
−
8 HV Ensures a clean and lossless
startup sequence
Description
This pin lets you adjust the level at which the cycle skipping process takes
place. Shorting this pin to ground permanently disables the skip cycle
feature.
By bringing this pin above 3.1 V, you permanently shut off the device.
By connecting an optocoupler to this pin, the peak current setpoint is ad-
justed accordingly to the output power demand.
This pin senses the primary current and routes it to the internal comparat-
or via an L.E.B. By inserting a resistor in series with the pin, you control
the amount of ramp compensation you need.
−
The driver’s output to an external MOSFET.
This pin is connected to an external bulk capacitor of typically 22 mF.
This unconnected pin ensures adequate creepage distance.
Connected to the high−voltage rail, this pin injects a constant current into
the VCC capacitor during the startup sequence.
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Adj
1
FB
2
Current
Sense
3
Ground
4
NCP1217, NCP1217A
Latchoff
+ Comparator
-
+
−
3.1 V
Set
Reset
Latch
UVLO
HV Current
Source
80 k 1.1 V
24 k
Skip Cycle
+ Comparator
-
Internal VCC
UVLO High and Low
250 ns
L.E.B.
19 k
65−100−133 kHz
Clock
Reset
Q Flip−Flop
Set DCmax = 74%
Reset
Q
Overload
Management
Ramp
Compensation
20 k 57 k
+
-
+ VREF
−
25 k
1 V 1ms SS*
±500 mA
HV
8
NC
7
VCC
6
Drv
5
* Available for “A” version only
Figure 2. Internal Circuit Architecture
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage
VCC 16 V
Power Supply Voltage on All Other Pins Except Pin 8 (HV), Pin 6 (VCC) and Pin 5 (Drv)
Maximum Voltage on Pin 8 (HV), Pin 6 (VCC) Decoupled to Ground with 10 mF
Maximum Voltage on Pin 8 (HV), Pin 6 (VCC) Grounded
Minimum Operating Voltage on Pin 8 (HV)
−
−0.3 to 10
V
VHV 500 V
VHV 450 V
28 V
Maximum Current into All Pins Except VCC (6) and HV (8) when 10 V ESD Diodes are Activated
Thermal Resistance, Junction−to−Case
Thermal Resistance, Junction−to−Air, PDIP−7 Version
Thermal Resistance, Junction−to−Air, SO−8 Version
Maximum Junction Temperature
Temperature Shutdown
−
RqJC
RqJA
RqJA
TJMAX
−
5.0 mA
57 °C/W
100 °C/W
178
150 °C
155 °C
Hysteresis in Shutdown
− 30 °C
Storage Temperature Range
−
−60 to +150
°C
ESD Capability, HBM Model (All Pins Except VCC and HV)
ESD Capability, Machine Model
− 2.0 kV
− 200 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.
1. This device series contains ESD protection rated using the following tests:
Human Body Model (HBM) 2000 V per JEDEC Standard JESD22, Method A114E.
Machine Model (MM) 200 V per JEDEC Standard JESD22, Method A115A.
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