NCP1217, NCP1217A Enhanced PWM Current−Mode Controller for High−Power Universal Off−Line Supplies Houd in an SO−8 or PDIP−7 package, the NCP1217 reprents the enhanced version of the NCP1203−bad controllers. Thanks to its high drive capability, NCP1217 drives large gate−charge MOSFETs, which together with internal ramp compensation and built−in
overvoltage protection, ea the design of modern AC/DC adapters. NCP1217 offers a true alternative to UC384X−bad 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 quence. Its current−mode control topology provides an excellent input audio−susceptibility and inherent pul−by−pul control. Internal ramp compensation easily prevents subharmonic oscillations from taking place in continuous conduction mode designs.
When the current tpoint 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. Becau this occurs at a ur adjustable low peak current, no acoustic noi takes place.
The NCP1217 features two efficient protective circuitries: 1) In prence of an overcurrent condition, th
e output puls 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 nsor) pulls Pin 1 above 3.2 V, output puls are immediately stopped and the NCP1217 stays latched in this position. Ret occurs when the V CC collaps to ground, e.g. the ur 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 •Pb−Free Packages are Available
Typical Applications
•High Power AC/DC Converters for TVs, Set−Top Boxes, etc.•Offline Adapters for Notebooks
•Telecom DC−DC Converters
•All Power Supplies
MARKING
DIAGRAMS xxxx=Specific Device Code
A=Asmbly Location
L, WL=Wafer Lot
Y, YY=Year
W, WW=Work Week
G or G=
Pb−Free Package
<
PDIP−8
N SUFFIX
CASE 626
SOIC−8
D1, D2 SUFFIX
CASE 751
1
8
5
3
4
(Top View)
Adj
CS
HV
PIN CONNECTIONS
7
6
2NC
FB
GND Drv
V CC
See detailed ordering and shipping information in the ordering information ction on page 16 of this data sheet.
ORDERING INFORMATION
8
P1217xxxx
AWL
YYWWG
1
See detailed device marking information in the ordering information ction on page 16 of this data sheet.
DEVICE MARKING INFORMATION
Figure 1. Typical Application Example
OUT
PIN FUNCTION DESCRIPTION
Pin No.Pin Name
Function
普洱府
Description
1
Adj
Adjust the skipping peak current
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.2FB Sets the peak current tpoint By connecting an optocoupler to this pin, the peak current tpoint is ad-justed accordingly to the output power demand.
3
CS
Current n input
This pin ns the primary current and routes it to the internal compara-tor via an L.E.B. By inrting a resistor in ries with the pin, you control the amount of ramp compensation you need.
4Gnd The IC ground −
5Drv Driving puls The driver’s output to an external MOSFET.
6V CC Supplies the IC
This pin is connected to an external bulk capacitor of typically 22 m F.
7NC −
This unconnected pin ensures adequate creepage distance.
8
HV
Ensures a clean and lossless startup quence
Connected to the high−voltage rail, this pin injects a constant current into the V CC capacitor during the startup quence.
Figure 2. Internal Circuit Architecture
* Available for “A” version only
MAXIMUM RATINGS
Rating Symbol Value Unit Power Supply Voltage
V CC 16
V Power Supply Voltage on All Other Pins Except Pin 8 (HV), Pin 6 (V CC ) and Pin 5 (Drv)−−0.3 to 10V Maximum Voltage on Pin 8 (HV), Pin 6 (V CC ) Decoupled to Ground with 10 m F V HV 500V Maximum Voltage on Pin 8 (HV), Pin 6 (V CC ) Grounded
V HV 450V Maximum Current into All Pins Except V CC (6) and HV (8) when 10 V ESD Diodes are Activated − 5.0mA
Thermal Resistance, Junction−to−Ca
R q JC 57°C/W Thermal Resistance, Junction−to−Air, PDIP−7 Version Thermal Resistance, Junction−to−Air, SO−8 Version R q JA
R q JA 100178°C/W Maximum Junction Temperature T JMAX 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)− 2.0kV ESD Capability, Machine Model
−
200
V
Maximum ratings are tho values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If the limits are exceeded, device functional operation is not implied,damage may occur and reliability may be affected.
ELECTRICAL CHARACTERISTICS (For typical values T J = 25°C, for min/max values T J = 0°C to +125°C, Max T J = 150°C,
V CC= 11 V unless otherwi noted.)
Characteristic Pin Symbol Min Typ Max Unit SUPPLY SECTION (All frequency versions, unless otherwi noted)
Turn−On Threshold Level, V CC Going Up6VCC ON11.812.813.8V Minimum Operating Voltage After Turn−On6VCC min 6.97.68.3V V CC Decreasing Level at which the Latchoff Pha Ends6VCC latch− 5.6−V
Internal IC Consumption, No Output Load on Pin 5, F SW= 65 kHz 6ICC1−9601110
(Note 1)
m A
Internal IC Consumption, No Output Load on Pin 5, F SW= 100 kHz 6ICC1−10201180
(Note 1)
m A
Internal IC Consumption, No Output Load on Pin 5, F SW= 133 kHz 6ICC1−10601200
(Note 1)
m A
Internal IC Consumption, 1.0 nF Output Load on Pin 5, F SW= 65 kHz 6ICC2− 1.7 2.0
(Note 1)
mA
Internal IC Consumption, 1.0 nF Output Load on Pin 5, F SW= 100 kHz 6ICC2− 2.1 2.4
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(Note 1)
mA
Internal IC Consumption, 1.0 nF Output Load on Pin 5, F SW= 133 kHz 6ICC2− 2.4 2.9
(Note 1)
mA
Internal IC Consumption, Latchoff Pha, V CC = 6.0 V6ICC3−230−m A INTERNAL STARTUP CURRENT SOURCE (T J u 0°C)
High−Voltage Current Source, V CC = 10 V8IC1 3.5
大走访(Note 2)
6.07.8mA
日本鬼子的罪行High−Voltage Current Source, V CC = 08IC2−7.0−mA DRIVE OUTPUT
Output Voltage Ri−Time @ CL = 1.0 nF, 10−90% of a 12 V
Output Signal
5T r−60−ns
Output Voltage Fall−Time @ CL = 1.0 nF, 10−90% of a 12 V
Output Signal
5T f−20−ns Source Resistance5R OH152035W Sink Resistance5R OL 5.01018W CURRENT COMPARATOR (Pin 5 Unloaded)
Input Bias Current @ 1.0 V Input Level on Pin 33I IB−0.02−m A Maximum Internal Current Setpoint3I Limit0.9 1.0 1.1V Default Internal Current Setpoint for Skip Cycle Operation3I Lskip−330−mV Propagation Delay from Current Detection to Gate OFF State3T DEL−90150ns Leading Edge Blanking Duration3T LEB−250−ns INTERNAL OSCILLATOR (V CC = 11 V, Pin 5 Loaded by 1.0 k W)
Oscillation Frequency, 65 kHz Version−f OSC58.56571.5kHz Oscillation Frequency, 100 kHz Version−f OSC90100110kHz Oscillation Frequency, 133 kHz Version−f OSC120133146kHz Maximum Duty−Cycle, NCP1217−Dmax697480% Maximum Duty−Cycle, NCP1217A−Dmax4246.550%
1.Maximum Value @ T J = 0°C.
2.Minimum Value @ T J = 125°C.
ELECTRICAL CHARACTERISTICS (continued) (For typical values T J = 25°C, for min/max values T J = 0°C to +125°C,
Max T J = 150°C, V CC = 11 V unless otherwi noted.)
Characteristic
Pin
Symbol
Min
Typ
Max
Unit
FEEDBACK SECTION (V CC = 11 V, Pin 5 Loaded by 1.0 k W )Internal Pull−Up Resistor
2Rup −19−k W Pin 2 (FB) to Internal Current Setpoint Division Ratio −
Iratio
−
3.3
−
−
SKIP CYCLE GENERATION Default Skip Mode Level 1Vskip 0.93 1.1 1.26V Pin 1 Internal Output Impedance 1
Zout
−
27
−
k W
INTERNAL RAMP COMPENSATION Internal Ramp Level @ 25°C (Note 3)3Vramp 2.6 2.9 3.2V Internal Ramp Resistance to CS Pin 3
Rramp
−
19
−
k W
ADJUSTMENT LATCHOFF LEVEL Latching Level
1
Vlatch
房地产公司排名
2.69
3.10
3.42
果汁英语怎么说V
3. A 1.0 M W resistor is connected to the ground for the measurement.
TYPICAL CHARACTERISTICS
6020H V P I N L E A K A G E C U R R E N T @ 500V (m A )
080104050Figure 5. VCC MIN vs. Temperature
Figure 6. ICC 1.0 nF Load vs. Temperature
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TEMPERATURE (°C)
V C C M I N , (V )
TEMPERATURE (°C)
7030
TYPICAL CHARACTERISTICS (continued)
−50
5.8050
5.500V C C l a t c h , (V )
5.305.90TEMPERATURE (°C)
5.405.605.70150
100Figure 7. Switching Frequency vs.
Temperature
Figure 8. VCC latch vs. Temperature
TEMPERATURE (°C)
−50
130
50
0F O S C , (k H z )
50150
7090110
150
100
TEMPERATURE (°C)
TEMPERATURE (°C)
−50
50
3000I C C 3, (m A )
Work的意思200500250350150100−50
2550
100D R I V E S I N K R E S I S T A N C E , (W )
030TEMPERATURE (°C)
51520150
100−50
1.05
50
0.95
0C U R R E N T S E N S E L I M I T , (V )
0.901.101.00
150
100Figure 9. ICC3 vs. Temperature
Figure 10. Drive Source Resistance vs.
Temperature
Figure 11. Drive Sink Resistance vs.
Temperature Figure 12. Current Sen Limit vs.
Temperature
−50
2550
100D R I V E S O U R C E R E S I S T A N C E , (W )
030TEMPERATURE (°C)
51520150
100400450
