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HV9221
Advanced Information
High Frequency Multi-Function Current Mode PWM Controller
Ordering Information
Device HV9221 28-pin DIP HV9221P Package Options SOW-28 HV9221WG Die HV9221X
Features
Current-mode control 15 to 450 volt input range internal start-up circuit 50A standby supply current 2mA operating supply current Under-voltage lockout Internal soft start 1% tolerance band gap voltage reference 1.5 MHz low offset error amplifier 1 MHz oscillator High current output drivers (1.5A peak, 0.5A continuous) Driver outputs have low output impedance with VCC = 0V Current sense leading edge threshold switching Fast (25 nsec) over current shutdown Buffered slope compensation ramp generators Fault tolerant single pin synchronization of multiple converters All pins are ESD protected
General Description
The Supertex HV9221 is a dual high-speed Current Mode Switching Power Supply controller that can start and run directly from almost any DC input from 15 volts DC to rectified and filtered 240 volt AC line. This unique input circuit allows the HV9221 to selfstart directly from a high voltage input, and subsequently take the power from an auxiliary converter output which it is controlling, thus allowing very efficient operation while maintaining input-tooutput galvanic isolation limited only by the insulation system of the associated magnetic assembly. When powered by the auxiliary converter outputs or with both outputs disabled (oscillator shuts down) the input current on the +VIN pin is reduced to a maximum of 50A which is beneficial especially in telecommunication applications.
Absolute Maximum Ratings*
+VIN, Input Voltage VCC, Supply Voltage Operating Temperature Range -0.5V to +450V -0.5V to +15.5V -40C to +85C -65C to +150C SOW-28 28-pin DIP
Note: *All voltages are referenced to GND.
Operating Modes
1. Single push-pull converter. 2. Dual 49% duty cycle controller with 180 phasing. 3. Dual 99% duty cycle controller with 180 phasing.
Storage Temperature Range Power Dissipation @ 25C
1.0W 1.2W
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HV9221
Electrical Characteristics
(Unless otherwise specified, -VIN = 0V, VCC = 10V; -40C TA +85C) Symbol Parameters Min Typ Max Unit Conditions
Pre-regulator/Start-up
+VIN +IIN ISTART VPR VDELTA VHYST Input voltage Input leakage current Pre-regulator start-up current VCC pre-regulator voltage VPR - Vuvlo (turn-on) Under voltage lockout hysteresis Over voltage lockout Over voltage lockout hysteresis 40 7.8 0.1 0.9 14.5 2.5 8.0 0.2 1.0 15.0 3.0 8.2 0.3 1.1 15.5 3.5 15 20 450 50 V A mA V V V V V +VIN = 450V, VCC = VREG, Enable A & B = 0 +VIN = 15V, VCC = Vuvlo, Enable A & B = 0 +VIN = 15 to 450V
Supply
ICC Supply current 2 mA CLOAD = 50pF, fOSC = 500KHz
Reference
VR Reference output voltage Load regulation Line regulation VR Reference output voltage Output noise voltage Long term stability ISREF Short circuit current -4 3 -6 -10 2.45 2.48 2.50 1 2 2.50 2.55 200 2.52 5 V mV mV V V mV mA TA = 25C 0 mA < IREF < 3mA UVLO stop threshold +0.5V < VCC < 13V Full temp. range, 0mA < IREF < 3mA 10Hz < f < 10KHz, TJ = 25C TA = 125C, 1000 hrs.
Error Amplifiers
IFB or INI Input bias current VOS VCM AVOL BW IOUT IOUT PSRR Input offset voltage Common mode input range Open loop voltage gain Unity gain bandwidth Output current sourcing Output current sinking Power supply rejection 2 50 0 60 1.5 80 2.5 -2 4 90 -1 25 5 200 25 VCC nA mV V dB MHz mA mA dB VFB < VNI VFB > VNI 8.5V < VCC < 14.5 VFB = 3.0V, VNI = 2.5V
MOSFET Driver Outputs
0.10 VOL VOH ISOURCE ISINK Output low level 0.3 0.5 Output high level (VCC - VOUT) Peak output current sourcing Peak output current sinking Output rise time Output fall time 14-39 1300 0.12 0.4 -1500 1500 20 20 30 30 0.15 0.6 0.7 0.2 0.7 -1300 V V V V V mA mA ns ns IOUT = 20mA IOUT = 500mA IOUT = 20mA, VCC = 0V IOUT = -20mA IOUT = -500mA VOUT = 0V VOUT = VCC CLOAD = 2nF CLOAD = 2nF
HV9221
Electrical Characteristics
Symbol Parameters
(continued)
Min Typ Max Unit Conditions
(Unless otherwise specified, -VIN = 0V, VCC = 10V; -40C TA +85C)
Oscillator
900 fOSC Initial accuracy 450 90 Temperature coefficient Voltage stability VSYNC(out)high ICYNC(out)high VSYNC(out)low ISYNC(out)low VSYNC(in) VSYNC(in) ISYNC(in) Sync output voltage - high Sync output current - high Sync output voltage - low Sync output current - low Maximum Sync input voltage Sync threshold - low Sync input current - low 0.8 1.7 -20 0.5 0.3 -1.0 5.5 2.0 -30 4.5 1000 500 100 100 1 5.0 1100 550 110 300 2 5.5 10 0.5 KHz KHz KHz ppm/C % V A V mA V V A RT = TBD, RD = 0 RT = TBD, RD = 0 RT = TBD, RD = 0 fOSC = 100KHz fOSC=100KHz, 15V >VCC > 8V
Current Sensing
VCSA & VCSB VCSA & VSCB VCSA & VCSB Usable control current sense range Current limit threshold Leading edge current limit threshold Leading edge threshold time Current limit delay to output 0.5 1.1 1.1 45 1.2 1.3 50 30 1.0 1.3 1.5 55 50 V V V nsec nsec
Slope Compensation Ramp Generators
VCSA or VCSB VSCA or VSCB VSCA or VSCB Peak voltage Peak voltage Valley voltage Output impedance 0.9 1.8 0 1 2.0 0.01 1.1 2.2 0.02 5 V V V 49% duty cycle or push-pull mode 99% duty cycle mode
Logic Controls Inputs (ENABLE-A, ENABLE-B, PP, 49%/99%)
VENABLE VENABLE VENABLE(high) IENABLE(high) VENABLE(low) IENABLE(low) Maximum input voltage Open terminal voltage Pull high threshold voltage Pull high input current Pull low threshold voltage Pull low input current 1.8 -1.8 0.5VCC -2.0 100 2.0 -100 2.2 -2.2 VCC V V V A V A Referenced to VCC
Over Temperature Shutdown
Shutdown junction temperature Hysteresis (temperature drop) 110 40 125 50 140 60 C C
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HV9221
Block Diagram
NIA FBA COMPA CSA ENABLE-A TN-Level Enable Detection and Latch 50nSec One-Shot Over Current Comparator A 1.2V +
- - +
REF 8.0V Thermal Shutdown 0.2V - and Latch Circuit UVLO
+ + + - -
VCC
- +
Internal Reference Generators
+VIN +15.0V
OVLO
5mSec Soft-Start
- +
GND
R SQ
Substrate OUT-A
PWRGND
OUT-B SQ
+ - -
R
1.2V + Over Current Comparator B 5mSec Soft-Start
+ -
Tri-Level Enable Detection 10 and Latch 1K
ENA ENB
PP PP
50-Sec One-Shot
Oscillator
NIB
FBB
COMPB
CSB ENABLE-B
SCA
SCB
MODE
SYNC
A B
RD
RT
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HV9221
Pin Descriptions
GND - Ground connection for all low level analog and digital circuits. PWRGND - This pin provides ground return for the high transient currents of the output driver circuits. +VIN - This is the start-up pre-regulator input which can accept input voltages in the range of 15 to 450 volts DC. VCC - This is the supply pin to the PWM circuit. During start-up this pin is powered by the start-up linear pre-regulator which regulates to a nominal voltage of 8 volts over the full input voltage range of the +VIN pin. OUT-A, OUT-B - These high current push-pull outputs of the PWM are designed to drive the gates of power MOSFETs. REF - This pin provides a 1% accuracy 2.5 volts buffered, low output impedance reference. ENABLE-A, ENABLE B - These input pins provide means for shutting down the PWM. MODE - This input is used to select the operating mode of this PWM. The mode selections are as follows: Pin Connection GND OPEN VCC Operating Mode 49% Dual PWM 99% Dual PWM 49% Single Push-Pull PWM SYNC - This bidirectional Input/Output negative transition active pin provides a means for synchronizing several PWM chips or synchronizing against an application system master oscillator. SCA, SCB - These low impedance output buffered ramp generators provide positive going ramp outputs corresponding to the mode of operation of this PWM circuit and is intended to enable the user to provide optimal slope compensation to the feedback circuits. CSA, CSB - These are the current sense inputs to the PWM comparators. COMPA, COMPB - The low impedance output of the error amplifiers. FBA, FBB - The high impedance inverting input of the error amplifiers. NIA, NIB - The high impedance non-inverting input of the error amplifiers. RT - The oscillator charging current is set by the value of the resistor connected from RT to GND. RD - External resistor to GND to control the discharge rate of the internal timing capacitor.
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