C126631
The C126631 is an electronic component. View the full C126631 datasheet below including absolute maximum ratings.
Overview
Part: NCP1271 — onsemi
Type: Standby PWM Controller
Description: A fixed-frequency current-mode PWM controller with adjustable Soft-Skip mode for excellent standby power consumption, integrated high-voltage startup FET, and frequency jittering for EMI reduction. Available in 65 kHz or 100 kHz versions.
Operating Conditions:
- Supply voltage: 10–20 V (VCC pin)
- Operating junction temperature: -40 to +150 °C
- Oscillation frequency: 65 kHz or 100 kHz
Absolute Maximum Ratings:
- Max VCC pin voltage: +20 V
- Max HV pin voltage: +500 V
- Max continuous current (VCC, Skip/Latch, FB, CS pins): 100 mA
- Max continuous current (HV pin): +500 mA / -800 mA
- Max junction temperature: +150 °C
- Max storage temperature: +150 °C
Key Specs:
- Oscillation Frequency (65 kHz version, Tj=25°C): 65 kHz (typ)
- Oscillation Frequency (100 kHz version, Tj=25°C): 100 kHz (typ)
- Maximum Duty Cycle: 80% (typ)
- Gate Drive Output High Resistance: 11 Ω (typ, VCC=14V, Drv=300Ω to Gnd)
- Gate Drive Output Low Resistance: 6.0 Ω (typ, VCC=14V, Drv=1.0V)
- Maximum Current Threshold: 1.0 V (typ)
- Startup Threshold, VCC Increasing: 12.6 V (typ)
- Minimum Operating Voltage After Turn-On: 9.1 V (typ)
- Operating Supply Current (65 kHz version): 2.3 mA (typ, VCC=14V, 1.0nF Load, VFB=2.0V)
Features:
- Fixed-Frequency Current-Mode Operation with Ramp Compensation
- Skip Cycle in Standby Condition ('Soft-Skip Mode')
- Timer-Based Fault Protection
- Internal High-Voltage Startup Current Source
- ±5% Current Limit Accuracy over Full Temperature Range
- Adjustable Skip Level
- Internal Latch for Overvoltage and Overtemperature Protection
- Frequency Jittering for Softened EMI Signature
- +500 mA / -800 mA Peak Current Drive Capability
- Sub-100 mW Standby Power achievable
- Pin-to-Pin Compatible with NCP120X Series
Applications:
- AC-DC Adapters for Notebooks, LCD Monitors
- Offline Battery Chargers
- Consumer Electronic Appliances (STB, DVD, DVDR)
Package:
- PDIP-7
- SO-7
Features
- Fixed -Frequency Current -Mode Operation with Ramp Compensation and Skip Cycle in Standby Condition
- Timer -Based Fault Protection for Improved Overload Detection
- 'Soft -Skip Mode' Technique for Optimal Noise Control in Standby
- Internal High -Voltage Startup Current Source for Lossless Startup
- " 5% Current Limit Accuracy over the Full Temperature Range
- Adjustable Skip Level
- Internal Latch for Easy Implementation of Overvoltage and Overtemperature Protection
- Frequency Jittering for Softened EMI Signature
- +500 mA/ -800 mA Peak Current Drive Capability
- Sub -100 mW Standby Power can be Achieved
- Pin -to -Pin Compatible with the Existing NCP120X Series
- This is a Pb -Free Device
Applications
- AC -DC Adapters for Notebooks, LCD Monitors
- Offline Battery Chargers
- Consumer Electronic Appliances STB, DVD, DVDR
1
Pin Configuration
| Pin No. | Symbol | Function | Description |
|---|---|---|---|
| 1 | Skip/latch | Skip Adjust or Latchoff | A resistor to ground provides the adjustable standby skip level. Additionally, if this pin is pulled higher than 8.0 V (typical), the controller latches off the drive. |
| 2 | FB | Feedback | An optocoupler collector pulls this pin low during regulation. If this voltage is less than the Skip pin voltage, then the driver is pulled low and Soft - Skip mode is activated. If this pin is open (>3 V) for more than 130 ms, then the controller is placed in a fault mode. |
| 3 | CS | Current Sense | This pin senses the primary current for PWMregulation. The maximum primary current is limited to 1.0 V / R CS where R CS is the current sense resistor. Additionally, a ramp resistor R ramp between the current sense node and this pin sets the compensation ramp for im- proved stability. |
| 4 | Gnd | IC Ground | - |
| 5 | Drv | Driver Output | The NCP1271's powerful output is capable of driving the gates of large Qg MOSFETs. |
| 6 | V CC | Supply Voltage | This is the positive supply of the device. The operating range is between 10 V (min) and 20 V (max) with a UVLO start threshold 12.6 V (typ). |
| 8 | HV | High Voltage | This pin provides (1) Lossless startup sequence (2) Double hiccup fault mode (3) Memory for latch - off shutdown and (4) Device protection if V CC is shorted to GND. |
Figure 2. Functional Block Diagram
ELECTRICAL CHARACTERISTICS (For typical values T J = 25 C, for min/max values, T J = -40 C to +125 C, V CC = 14 V, HV = open, skip = open, FB = 2 V, CS = Ground, DRV = 1 nF, unless otherwise noted.)
| Characteristic | Pin | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| OSCILLATOR | ||||||
| Oscillation Frequency (65 kHz Version, T J = 25 _ C) Oscillation Frequency (65 kHz Version, T J = - 40 to + 85 _ C) Oscillation Frequency (65 kHz Version, T J = - 40 to + 125 _ C) Oscillation Frequency (100 kHz Version, T J = 25 _ C) Oscillation Frequency (100 kHz Version, T J = - 40 to +85 _ C) Oscillation Frequency (100 kHz Version, T = - 40 to +125 _ C) | 5 | f osc | 61.75 58 55 95 89 85 | 65 65 65 100 100 100 | 68.25 69 69 105 107 107 | kHz |
| Oscillator Modulation Swing, in Percentage of f osc | 5 | - | - | " 7.5 | - | % |
| Oscillator Modulation Swing Period | 5 | - | - | 6.0 | - | ms |
| Maximum Duty Cycle (V CS = 0 V, V FB = 2.0 V) | 5 | D max | 75 | 80 | 85 | % |
| GATE DRIVE | ||||||
| Gate Drive Resistance Output High (V CC = 14 V, Drv = 300 W to Gnd) Output Low (V CC = 14 V, Drv = 1.0 V) | 5 | R OH R OL | 6.0 2.0 | 11 6.0 | 20 12 | W |
| Rise Time from 10% to 90% (Drv = 1.0 nF to Gnd) | 5 | t r | - | 30 | - | ns |
| Fall Time from 90% to 10% (Drv = 1.0 nF to Gnd) | 5 | t f | - | 20 | - | ns |
| CURRENT SENSE | ||||||
| Maximum Current Threshold | 3 | I Limit | 0.95 | 1.0 | 1.05 | V |
| Soft - Start Duration | - | t SS | - | 4.0 | - | ms |
| Soft - Skip Duration | - | t SK | - | 300 | - | m s |
| Leading Edge Blanking Duration | 3 | t LEB | 100 | 180 | 330 | ns |
| Propagation Delay (Drv =1.0 nF to Gnd) | - | - | - | 50 | 150 | ns |
| Ramp Current Source Peak | 3 | I ramp(H) | - | 100 | - | m A |
| Ramp Current Source Valley | 3 | I ramp(L) | - | 0 | - | m A |
| SKIP | ||||||
| Default Standby Skip Threshold (Pin 1 = Open) | 2 | V skip | - | 1.2 | - | V |
| Skip Current (Pin 1 = 0 V, T J = 25 _ C) | 1 | I skip | 26 | 43 | 56 | m A |
| Skip Level Reset (Note 5) | 1 | V skip - reset | 5.0 | 5.7 | 6.5 | V |
| Transient Load Detection Level to Disable Soft - Skip Mode | 2 | V TLD | 2.6 | 2.85 | 3.15 | V |
| EXTERNAL LATCH | ||||||
| Latch Protection Threshold | 1 | V latch | 7.1 | 8.0 | 8.7 | V |
| Latch Threshold Margin (V latch - m = V CC(off) - V latch ) | 1 | V latch - m | 0.6 | 1.2 | - | V |
| Noise Filtering Duration | 1 | - | - | 13 | - | m s |
| Propagation Delay (Drv = 1.0 nF to Gnd) | 1 | T latch | - | 100 | - | ns |
| SHORT - CIRCUIT FAULT PROTECTION | ||||||
| Time for Validating Short - Circuit Fault Condition | 2 | t protect | - | 130 | - | ms |
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions.
-
Please refer to Figure 39 for detailed description.
-
Guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued) (For typical values T J = 25 C, for min/max values, T J = -40 C to +125 C, VCC = 14 V, HV = open, skip = open, FB = 2 V, CS = Ground, DRV = 1 nF, unless otherwise noted.)
| Characteristic | Pin | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| STARTUP CURRENT SOURCE | ||||||
| High - Voltage Current Source Inhibit Voltage (I = 200 m A, HV = 50 V) | 6 | V inhibit I inhibit | 190 80 | 600 | 800 | mV |
| CC Inhibit Current (V CC = 0 V, HV = 50 V) | 6 | 200 | 350 | m A | ||
| Startup (V CC = V CC(on) - 0.2 V, HV = 50 V) | 6 | I HV | 3.0 | 4.1 | 6.0 | mA |
| Leakage (V CC = 14 V, HV = 500 V) | 8 | I HV - leak | 10 | 25 | 50 | m A |
| Minimum Startup Voltage (V CC = V CC(on) - 0.2 V, I CC = 0.5 mA) | 8 | V HV(min) | - | 20 | 28 | V |
| SUPPLY SECTION | ||||||
| V CC Regulation | 6 | |||||
| Startup Threshold, V CC Increasing | V CC(on) | 11.2 | 12.6 | 13.8 | V | |
| Minimum Operating Voltage After Turn - On | V CC(off) | 8.2 | 9.1 | 10 | V | |
| V CC Operating Hysteresis | V CC(on) - V CC(off) | 3.0 | 3.6 | 4.2 | V | |
| Undervoltage Lockout Threshold Voltage, V CC Decreasing | V CC(latch) | 5.0 | 5.8 | 6.5 | V | |
| Logic Reset Level (V CC(latch) -V CC(reset) > 1.0 V) (Note 7) | V CC(reset) | - | 4 | - | V | |
| V CC Supply Current | 6 | |||||
| Operating (V CC = 14 V, 1.0 nF Load, V FB = 2.0 V, 65 kHz Version) | I CC1 | - | 2.3 | 3.0 | mA | |
| Operating (V CC = 14 V, 1.0 nF Load, V FB = 2.0 V, 100 kHz Version) | I CC1 | - | 3.1 | 3.5 | mA | |
| Output Stays Low (V CC = 14 V, V FB = 0 V) | I CC2 | - | 1.3 | 2.0 | mA | |
| Latchoff Phase (V CC = 7.0 V, V FB = 2.0 V) | I CC3 | - | 500 | 720 | m A |
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions.
- Guaranteed by design.
Figure 3. Oscillation Frequency vs. Temperature
Figure 4. Maximum Duty Cycle vs. Temperature
Figure 5. Output Gate Drive Resistance vs. Temperature
Figure 5. Output Gate Drive Resistance vs. Temperature
Figure 7. Soft -Start Duration vs. Temperature
Figure 9. Default Skip Level vs. Temperature
Figure 6. Current Limit vs. Temperature
Figure 8. Leading Edge Blanking Time vs. Temperature
Figure 10. Skip Pin Current vs. Temperature
Figure 11. Skip Level Reset Threshold vs. Temperature
Figure 11. Skip Level Reset Threshold vs. Temperature
Figure 13. Latch Protection Level vs. Temperature
Figure 15. Startup Inhibit Voltage vs. Temperature
Figure 12. Transient Load Detection Level vs. Temperature
Figure 14. Fault Validation Time vs. Temperature
Figure 16. Startup Inhibit Current vs. Temperature
Figure 17. High Voltage Startup Current vs. Temperature
Figure 17. High Voltage Startup Current vs. Temperature
Figure 19. Startup Leakage Current vs. Temperature
Figure 21. Supply Voltage Thresholds vs. Temperature
Figure 18. Startup Current vs. V CC Voltage
Figure 20. Minimum Startup Voltage vs. Temperature
Figure 22. Supply Currents vs. Temperature
Absolute Maximum Ratings
| Rating | Symbol | Value | Unit |
|---|---|---|---|
| V CC Pin (Pin 6) | |||
| Maximum Voltage Range Maximum Current | V max I max | - 0.3 to +20 100 | V mA |
| Skip/Latch, FB, CS Pin (Pins 1 - 3) Maximum Voltage Range Maximum Current | V max I max | - 0.3 to +10 100 | V mA |
| Drv Pin (Pin 5) | |||
| Maximum Voltage Range | V max I | - 0.3 to +20 | V |
| HV Pin (Pin 8) Maximum Voltage | max | ||
| Maximum Current | max V | - 0.3 to +500 | V |
| Maximum Current Power Dissipation and Thermal Characteristics Thermal Resistance, Junction - to - Air, PDIP - 7, Low Conductivity | - 800 to +500 | mA | |
| Range | R q JA R q JL | 142 57 | C/W C/W |
| PCB (Note 3) Thermal Resistance, Junction - to - Lead, PDIP - 7, Low Conductivity PCB | I max | 100 | mA |
| Thermal Resistance, Junction - to - Air, PDIP - 7, High Conductivity PCB (Note 4) Thermal Resistance, Junction - to - Lead, PDIP - 7, High Conductivity PCB | R q JA | C/W | |
| q | 120 | C/W | |
| 3) | 56 | ||
| R JL | 177 | ||
| Thermal Resistance, Junction - to - Air, SO - 7, Low Conductivity PCB (Note Thermal Resistance, Junction - to - Lead, SO - 7, Low Conductivity PCB | R q JA | C/W C/W | |
| R q JL | 75 | ||
| Thermal Resistance, Junction - to - Air, SO - 7, High Conductivity PCB (Note 4) | R q JA | 136 | C/W |
| Thermal Resistance, Junction - to - Lead, SO - 7, High Conductivity PCB | R q JL | 69 | C/W |
| Operating Junction Temperature Range | T J | - 40 to +150 | C |
| Maximum Storage Temperature Range | T | - 60 to +150 | C |
| ESD Protection 6 | stg HBM | 2000 150 | V |
| Human Body Model ESD Pins 1 - Human Body Model ESD Pin 8 Machine Model ESD Pins 1 - 4, 8 | HBM MM | 700 200 | V V V |
| Machine Model ESD Pins 5, 6 | MM | ||
| Charged Device Model ESD | |||
| CDM | 1000 | V |
Typical Application
- AC -DC Adapters for Notebooks, LCD Monitors
- Offline Battery Chargers
- Consumer Electronic Appliances STB, DVD, DVDR
1
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| NCP1271 | onsemi | — |
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