|
|
Part: UC2844AAY
Category:
Power Management
-> PWM Controllers
Description: Current Mode PWM Controller
Company: Microsemi Corporation
Datasheet: Download UC2844AAY datasheet File size : 216 kB
Request For quote: Find where to buy UC2844AAY
Datasheet text preview:
L I N D O C #: 1840
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
T
HE
I
NFINITE
P
OWER
OF
I
N N O VAT I O N
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION The UC184xA family of control ICs provides all the necessary features to implement off-line fixed-frequency, current-mode switching power supplies with a minimum of external components. The current mode architecture demonstrates improved load regulation, pulse-by-pulse current limiting and inherent protection of the power supply output switch. The IC includes: A bandgap reference trimmed to ±1% accuracy, an error amplifier, a current sense comparator with internal clamp to 1V, a high current totem pole output stage for fast switching of power MOSFET's, and an externally programmable oscillator to set frequency and maximum duty cycle. The undervoltage lock-out is designed to operate with 250µA typ. start-up current, allowing an efficient bootstrap supply voltage design. Available options for this family of products, such as start-up voltage hysteresis and duty cycle, are summarized below in the Available Options section. The UC184xA family of control ICs is also available in 14-pin SOIC package which makes the Power Output Stage Collector and Ground pins available.
K E Y F E AT U R E S
s LOW START-UP CURRENT. (0.5mA max.) s TRIMMED OSCILLATOR DISCHARGE CURRENT. (See Product Highlight) p OPTIMIZED FOR OFF-LINE AND DC-TO-DC CONVERTERS. p AUTOMATIC FEED FORWARD COMPENSATION. p PULSE-BY-PULSE CURRENT LIMITING. p ENHANCED LOAD RESPONSE CHARACTERISTICS. p UNDER-VOLTAGE LOCKOUT WITH HYSTERESIS. p DOUBLE PULSE SUPPRESSION. p HIGH-CURRENT TOTEM POLE OUTPUT. p INTERNALLY TRIMMED BANDGAP REFERENCE. p 500KHz OPERATION. p LOW RO ERROR AMPLIFIER.
PRODUCT HIGHLIGHT
CO M PA R I S O N
OF
UC384XA
VS.
SG384X DISCHARGE CURRENT
A P P L I C AT I O N S SG384x
Ma x. Limit
UC384x A
SG384x
Min . Limit
TA=25°C
s ECONOMICAL OFF-LINE FLYBACK OR FORWARD CONVERTERS. s DC-DC BUCK OR BOOST CONVERTERS. s LOW COST DC MOTOR CONTROL.
A
VAILABLE
O
PTIONS
Part # UCx842A UCx843A
7.5 7.8 8.3 Mean 8.8 9.3
Start-Up Hysteresis Max. Duty Voltage Cycle 16V 8.4V 16V 8.4V 6V 0.8V 6V 0.8V <100% <100% <50% <50%
-3
+3
UCx844A UCx845A
Discharge Current Distribution - mA
PA C K A G E O R D E R I N F O R M AT I O N TA (°C) 0 to 70 -40 to 85 -55 to 125
at M P-lpsnic DIP 8i
UC384xAM UC284xAM --
at DM P-lpsnic SOIC 8i
UC384xADM UC284xADM --
lc D P4astiin SOIC 1 -p
UC384xAD UC284xAD --
Y C-eriamic DIP 8pn
-- UC284xAY UC184xAY
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. UC3842ADMT)
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
Copyright © 1995 Rev. 1.2 12/95
1 1 86 1 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
PRODUCT DATABOOK 1996/1997
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
P
RODUCTION
D
ATA
S
HEET
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PACKAGE PIN OUTS
COMP VFB ISENSE RT/CT
1 2 3 4 8 7 6 5
Supply Voltage (Low Impedance Source) (VCC) ......... 30V Supply Voltage (ICC < 30mA) ........ Self Limiting Output Current .... ±1A Output Energy (Capacitive Load) ......... 5µJ Analog Inputs (VFB & ISENSE) ...... -0.3V to +6.3V Error Amp Output Sink Current ....... 10mA Power Dissipation at TA = 25°C (M Package) ..... 1W Storage Temperature Range ........... -65°C to +150°C Lead Temperature (Soldering, 10 Seconds) .... 300°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. Pin numbers refer to DIL packages only.
V REF VCC OUTPUT GND
M & Y PACKAGE (Top View)
COMP VFB ISENSE RT/CT
1 2 3 4
8 7 6 5
V REF VCC OUTPUT GND
T H E R M A L DATA
M PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA DM PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA D PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA Y PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 130°C/W 120°C/W 165°C/W 95°C/W
COMP N.C. VFB N.C. ISENSE N.C. RT/CT
DM PACKAGE (Top View)
1 2 3 4 5 6 7
14 13 12 11 10 9 8
V REF N.C. VCC VC OUTPUT GND PWR GND
D PACKAGE (Top View)
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow
2
Copyright © 1995 Rev. 1.2 12/95
PRODUCT DATABOOK 1996/1997
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
P
RODUCTION
D
ATA
S
HEET
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for UC384xA with 0°C TA 70°C, UC284xA with -40°C TA 85°C, UC184xA with -55°C TA 125°C; VCC=15V; RT=10K; C T=3.3nF. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter Reference Section
Output Voltage Line Regulation Load Regulation Temperature Stability (Note 2 & 7) Total Output Variation Output Noise Voltage (Note 2) Long Term Stability (Note 2) Output Short Circuit Current
Symbol
Test Conditions
UC184xA/284xA UC384xA Units Min. Typ. Max. Min. Typ. Max.
4.95 5.00 5.05 4.90 5.00 5.10 6 20 6 20 6 25 6 25 0.2 0.4 0.2 0.4 4.9 5.1 4.82 5.18 50 50 5 25 5 25 -30 -100 -180 -30 -100 -180 47 52 0.2 5 1.7 8.3 57 1 47 52 0.2 5 1.7 8.3 57 1 V mV mV mV/°C V µV mV mA kHz % % V mA mA V µA dB MHz dB mA mA V V V/V V dB µA ns V V V V ns ns V
VREF
TJ = 25°C, IL = 1mA 12 VIN 25V 1 IO 20mA Over Line, Load, and Temperature 10Hz f 10kHz, TJ = 25°C TA = 125°C, t = 1000hrs
VN ISC
Oscillator Section
Initial Accuracy (Note 6) Voltage Stability Temperature Stability (Note 2) Amplitude (Note 2) Discharge Current TJ = 25°C 12 VCC 25V TMIN TA TMAX TJ = 25°C, VPIN 4 = 2V VPIN 4 = 2V, TMIN TA TMAX VPIN 1 = 2.5V IB AVOL UGBW PSRR IO L I OH VO H VO L AVOL PSRR IB Tp d VPIN 1 = 5V 12 VCC 25V VPIN 3 = 0 to 2V ISINK = 20mA ISINK = 200mA ISOURCE = 20mA ISOURCE = 200mA TJ = 25°C, CL = 1nF TJ = 25°C, CL = 1nF VCC = 5V, ISINK = 10mA 2 V O 4V Tj = 25°C 12 VCC 25V VPIN 2 = 2.7V, VPIN 1 = 1.1V VPIN 2 = 2.3V, VPIN 1 = 5V VPIN 2 = 2.3V, RL = 15K to ground VPIN 2 = 2.7V, RL = 15K to VREF
7.8 7.5
8.8 8.8
7.8 7.6
8.8 8.8
Error Amp Section
Input Voltage Input Bias Current Open Loop Gain Unity Gain Bandwidth (Note 2) Power Supply Rejection Ratio (Note 3) Output Sink Current Output Source Current Output Voltage High Level Output Voltage Low Level 2.45 2.50 2.55 2.42 2.50 2.58 -0.3 -1 -0.3 -2 65 90 65 90 0.7 1 0.7 1 60 70 60 70 2 6 2 6 -0.5 -0.8 -0.5 -0.8 5 6 5 6 0.7 1.1 0.7 1.1 2.85 0.9 3 1 70 -2 150 0.1 1.5 13.5 13.5 50 50 0.7 3.15 2.85 1.1 0.9 -10 300 0.4 2.2 13 12 150 150 1.2 3 1 70 -2 150 0.1 1.5 13.5 13.5 50 50 0.7 3.15 1.1 -10 300 0.4 2.2
Current Sense Section
Gain (Note 3 & 4) Maximum Input Signal (Note 3) Power Supply Rejection Ratio (Note 3) Input Bias Current Delay to Output (Note 2)
Output Section
Output Low Level Output High Level Rise Time (Note 2) Fall Time (Note 2) UVLO Saturation VO L VO H TR TF VSAT
13 12
150 150 1.2
( E l e c t r i c a l Cha r a c t e r i s t i c s cont i n u e next pa g e . )
Copyright © 1995 Rev. 1.2 12/95
3
Others parts begin by uc
UC-1 UC-2 UC-3 UC-4 UC-5 UC-6 UC-7 UC-8 UC-9 UC-10 UC-11 UC-12 UC-13 UC-14 UC-15 UC-16 UC-17 UC-18 UC-19 UC-20 UC-21 UC-22 UC-23 UC-24
|
|
|
