Document
NCP1901 Advance Information Primary Side Combination Resonant and PFC Controllers
The NCP1901 is a combination of PFC and half−bridge resonant controllers optimized for off−line adapter applications. This device includes all the features needed to implement a highly efficient and small form factor adapter. It integrates a critical conduction mode (CrM) power factor correction (PFC) controller and a half−bridge controller with a built−in 600 V driver. The half−bridge stage operates at a fixed frequency. Regulation is achieved by adjusting the PFC stage output voltage. This device includes an enable input on the PFC feedback pin, open feedback loop protection and PFC overvoltage and undervoltage detectors. Other features included in the NCP1901 are a 600 V startup circuit and an adjustable frequency oscillator. The controllers are properly sequenced, simplifying system design. Adjustable Half−Bridge Frequency up to 75 kHz Open Feedback Loop Protection CrM Power Factor Correction Controller PFC Undervoltage Detector PFC Overvoltage Detector Half−Bridge Controller with 600 V High Side Gate Drive State Machine Ensures Proper Turn−on and Turn−off of Half−Bridge Stage Enable Input on the PFC Feedback Pin Disables Controllers and Reduces Power Controllers are Properly Sequenced for Fault Free Operation Internal 600 V Startup Circuit This is a Pb−Free Device
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SO−20 WB DW SUFFIX CASE 751D
SOIC−16 D SUFFIX CASE 751B
MARKING DIAGRAM
16 NCP1901G AWLYWW 1 20 NCP1901 AWLYYWWG
Features
• • • • • • • • • • •
1 NCP1901 = Specific Device Code A = Assembly Location WL = Wafer Lot Y or YY = Year WW = Work Week G = Pb−Free Package
ORDERING INFORMATION
Device NCP1901DR2G NCP1901DWR2G Package SOIC−16 (Pb−Free) SO−20 WB (Pb−Free) Shipping† 2500/T ape & Reel 1000/T ape & Reel
Typical Applications
• High Efficiency Notebook Adapter • Solid State Lighting
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D.
This document contains information on a new product. Specifications and information herein are subject to change without notice.
© Semiconductor Components Industries, LLC, 2009
February, 2009 − Rev. P0
1
Publication Order Number: NCP1901/D
Free Datasheet http://www.datasheet4u.com/
NCP1901
SO−20 WB HV 1 NC 2 NC 3 OSC 4 GND 5 VREF 6 PFB 7 PCS 8 PZCD 9 PControl 10 20 HBoost 19 HDRVhi 18 HVS 17 NC 16 NC 15 HDRVlo 14 PDRV 13 PGND 12 VCC 11 PCT HV OSC GND VREF PFB PCS PZCD PControl SOIC−16 1 HBoost HDRVhi HVS HDRVlo PDRV PGND VCC PCT
Figure 1. Pin Connections
VCC PDRV − + PZCD HV ZCD Comparator Istart UVLO VCC Good S Q Dominant Reset Latch Q R Level Shifter On time Comparator Level Shifter + − PFC OVP Comparator − + Pulse Trigger Delay Q Clock CLK Q Q Enable PDRV UVLO S R Q Delay Q CLK + − + 5V/ 3V − VDD IOSC(C) OSC 4*IOSC(C) VCC Management + − + − VCC(on)/ VCC(off)/ UVLO VCC CCC Dboost HBoost HDRVhi HVS VCC HDRVlo GND
VDD > 5.65 V Clamp < 2.25 V Clamp PFC Error Amplifier + −
+
PControl
VZCD
Undervoltage Detector S Dominant Reset Q Latch R
PFB
IPFB VDD IPCT(C)
+ −
VPREF
Cboost
PCT
+ PFC UVP VPOVP − Comparator + VPUVP − + − VCCGood
+ −
VPCS(ILIM)
+ −
PCS
LEB
PCS Comparator
VDD
Voltage Reference
VREF
Figure 2. Functional Block Diagram
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2
Free Datasheet http://www.datasheet4u.com/
NCP1901
Table 1. PIN FUNCTION DESCRIPTION
20 Pin 1 16 Pin 1 Name HV Description This is the input of the high voltage startup regulator and connects directly to the bulk voltage. A constant current source supplies current from this pin to the VCC capacitor, eliminating the need for an external startup resistor. The charge current is 7.5 mA (typical). A capacitor on this pin adjusts the frequency of the internal oscillator. The oscillator sets the frequency of the half−bridge controller. The half−bridge operates at half the oscillator frequency. Analog ground. Reference voltage. The capacitor on this pin decouples the internal reference. A 0.1 mF capacitor needs to be connected between this pin and ground. PFC voltage feedback input. The voltage on this pin is compared to a 2.5 V reference (typical) to regulate the PFC output voltage. The voltage on this pin is also used to detect PFC undervoltage and overvoltage conditions. PFC regulator current sense input. A voltage ramp proportional to the PFC switch current is applied to this pin. The current sense threshold, VPCS(ILIM), is typically 0.84 V. A 110 ns (typical) leading edge blanking circuit filters the current sense signal at the start of each cycle. PFC inductor zero current detector. The inductor current is monitored using an auxiliary winding on the PFC inductor. The PFC drive signal is enabled during a high to low transition on the PZCD pin. A series resistor limits the current into the PZCD pin. PFC control voltage. This pin connects to the output of the PFC error amplifier. The error amplifier is a transconducta.