HIGH PERFORMANCE CURRENT MODE CONTROLLERS 40ns output rise 30ns o

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HIGH PERFORMANCE CURRENT MODE CONTROLLERS 40ns output rise 30ns o

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GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE CONTROLLERS
40ns output rise 30ns output fall times -40°C +85°C temp. range same standard UC284x Low-power BiCMOS Process Very start-up current (50µA typical) operating current (4mA typical) CMOS outputs with rail-to-rail swing 500kHz current-mode operation Pin-for-pin compatible with UC3842/3843/3844/3845(A) Trimmed oscillator discharge current UVLO with hysteresis cross-conduction currents
CONNECTIONS
COMP
VREF
ISNS
GM38C4x fixed frequency, high performance, currentmode controllers. Gamma's BiCMOS devices compatible with standard 384x bipolar devices with several improvements. Undervoltage lockout circuitry allows versions start 14.5V operate down versions start 8.4V with operation down 7.6V. versions operate 20V. When compared bipolar 384x devices operating from supply, start-up current been reduced 50µA typical operating current been reduced typical. Decreased output rise fall times drive larger MOSFETs, rail-to-rail output capability increases efficiency, especially lower supply voltages. GM38C4x also features trimmed oscillator discharge current bandgap reference. GM38C4x denotes 8-pin plastic packages. GM38C4x-1 denotes 14-pin plastic packages. 8pin devices feature small size, while 14-pin devices separate analog power connections improved performance power dissipation.
DIP-8, SOP-8 (TOP VIEW)
COMP ISNS
VREF PGND
Applications: Current-mode, off-line, switched-mode power supplies Current-mode, dc-to-dc converters. Step-down "buck" regulators Step-up "boost" regulators Flyback, isolated regulators Forward converters Synchronous converters
DIP-14, SOP-14 (TOP VIEW)
Revision 2002
www.gammamicro.com
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE CONTROLLERS
FUNCTIONS DESCRIPTION
8-lead 14-lead FUNCTION COMP ISNS RT/CT PGND AGND VREF DESCRIPTION Compensation: Connect external compensation network modify error amplifier output. internally connected. Feedback (Input): Error amplifier input. Feedback 2.5V desired output voltage. internally connected. Current Sense (Input): Current sense comparator input. Connect current sensing resistor current transformer. internally connected. Timing Resistor/Timing Capacitor: Connect external network select switching frequency. Ground: Combined analog power ground. Power Ground: N-channel driver transistor ground. Analog Ground: Controller circuitry ground. Power Output: Totem-pole output. Power Supply (Input): P-channel driver transistor supply input. Return power ground (PGND). Analog Supply (Input): Controller circuitry supply input. Return analog ground (AGND). internally connected. Reference (Output): Connect external network.
Revision 2002
www.gammamicro.com
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE CONTROLLERS
ABSOLUTE MAXIMUM RATINGS
PARAMETER Zener Current Operation require special precautions (Note Supply Voltage Switch Supply Voltage Current Sense Voltage Feedback Voltage Output Current Storage Temperature SYMBOL IOUT VALUE -0.3 +5.5 -0.3 +5.5 +150 UNITS
OPERATING RATINGS
PARAMETER Junction Temperature 8-pin Plastic 8-pin SOIC Package Thermal Resistance 14-pin Plastic 14-pin SOIC SYMBOL VALUE UNITS
ORDERING INFORMATION
PART GM38C42A GM38C43A GM38C44A GM38C45A PACKAGE SOP-8 GM38C42-S8 GM38C43-S8 GM38C44-S8 GM38C4A-S8 SOP-14 GM38C42-S14 GM38C43-S14 GM38C44-S14 GM38C45-S14 DIP-8 GM38C42-D8 GM38C43-D8 GM38C44-D8 GM38C45-D8 DIP-14 GM38C42-D14 GM38C43-D14 GM38C44-D14 GM38C45-D14
Revision 2002
www.gammamicro.com
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE CONTROLLERS
ELECTRICAL CHARACTERISTICS
-40°C 85°C, Note VDD=15V, CT=3.3nF, RT=11k, unless otherwise noted
CHARACTERISTICS Reference Section Output Voltage Line Regulation Load Regulation Temperature Stability Total Output Variation Output Noise Voltage Long Term Stability Short Circuit Output Current Oscillator Section Initial Accuracy Voltage Stability Temperature Stability Clock Ramp Reset Current Amplitude Error Amplifier Section Input Bias Current Input Voltage Open Loop Voltage Gain Power Supply Rejection Ratio Output Sink Current Output Source Current High Output Voltage Output Voltage Unity Gain Bandwidth Current Sense Section Gain Maximum Threshold PSRR Input Bias Current Delay Output
TEST CONDITIONS
UNIT
TA=25°C, =1mA 25V, =5µA, Note 20mA Note Line, Load, Temp., Note1 10Hz 10kHz, TA=25°C, Note1 TA=125°C, 1000 hrs., Note
mV/°C
4.82
5.18
-180
TA=25°C, Note 18V, Note TMIN TMAX, Note TA=25°C, VRT/CT TMIN TMAX VRT/CT (peak peak)
0.04
Vp-p
VCOMP 2.5V 2.7V, VCOMP 1.1V 2.3V, VCOMP 2.3V, RL=15k 2.7V, RL=15k VREF Note 2.42 -0.5
-0.1
2.58
Notes VCOMP Note Note
2.85
-0.1
3.15
Revision 2002
www.gammamicro.com
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE CONTROLLERS
ELECTRICAL CHARACTERISTICS
-40°C 85°C, Note VDD=15V, CT=3.3nF, RT=11k, unless otherwise noted
UNIT
CHARACTERISTICS Output Section RDS(ON) High RDS(ON) Rise Time Fall Time Undervoltage Lockout Section Start Threshold
TEST CONDITIONS
ISOURCE ISINK TA=25°C, TA=25°C, GM38C42, GM38C44 GM38C43, GM38C45 GM38C42, GM38C44 GM38C43, GM38C45 13.5
14.5
15.5
Minimum Operating Voltage Section Maximum Duty Cycle Minimum Duty Cycle Total Standby Current Start-Up Current Operating Supply Current Zener Voltage
GM38C42, GM38C43 GM38C44, GM38C45
VDD=13V GM38C42, GM38C44 VDD=7.5V GM38C43, GM38C45 VISNS Note
Note These parameters, although guaranteed, 100% tested production. Note Parameter measured trip point latch with Note Gain defined
VPIN1
(ISNS)
(ISNS) 0.8V
Note Adjust above start threshold before setting 15V. Note Output frequency equals oscillator frequency GM38C42 GM38C43. Output frequency GM38C44, GM38C45 equals half oscillator frequency. Note 8-pin version, maximum input this also supply output stage. 14-pin version, maximum maximum
Revision 2002
www.gammamicro.com
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE CONTROLLERS
FUNCTIONAL BLOCK DIAGRAM
(12)
VREF (14)
Reference
UVLO
(VD) (11)
RT/CT
Oscillator
OUTPUT (10)
2.5V
(PGND)
COMP GND* (AGND) ISNS
8-lead versions only pins 14-lead versions only
Revision 2002
www.gammamicro.com
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE CONTROLLERS
SOP-8 PACKAGE OUTLINE DIMENSIONS
SYMBOL
Dimensions Millimeters 1.45 1.35 0.306 0.153 4.81 3.84 5.84 1.27 0.45 1.75 0.25 1.55 0.506 0.253 5.01 4.04 6.24
Dimensions Inches 0.057 0.004 0.053 0.012 0.006 0.189 0.151 0.23 0.05 0.018 0.039 0.069 0.01 0.061 0.02 0.01 1.197 0.159 0.246
Revision 2002
www.gammamicro.com
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE CONTROLLERS
DIP-8 PACKAGE OUTLINE DIMENSIONS
SYMBOL
Dimensions Millimeters 3.71 0.51 0.36 1.374 0.204 7.42 2.34 0.56 1.674 0.404 7.82 2.74 4.31
Dimensions Inches 0.146 0.02 0.126 0.014 0.054 0.008 0.354 0.244 0.292 0.092 0.122 0.327 0.142 0.022 0.066 0.016 0.37 0.26 0.308 0.108 0.138 0.358 0.17
Revision 2002
www.gammamicro.com
GM38C42,GM38C43,GM38C44,GM38C45
HIGH PERFORMANCE CURRENT MODE CONTROLLERS
SOP-14 PACKAGE OUTLINE DIMENSIONS
SYMBOL
Dimensions Millimeters 1.35 0.10 1.45 0.33 0.19 8.55 3.80 1.27 5.80 0.40 6.20 1.27 0.10 0.228 0.016 0.51 0.25 8.75 4.00 0.013 0.007 0.337 0.150 1.60 1.75 0.25 0.053 0.004
Dimensions Inches 0.063 0.057 0.020 0.010 0.344 0.157 0.050 0.244 0.050 0.004 0.069 0.010
NOTE PACKAGE BODY SIZES EXCLUDE MOLD FLASH GATE BURRS DIMENSION MEASURED GAGE PLANE TOLERANCE 0.10 UNLESS OTHERWISE SPECIFIED CONTROLLING DIMENSION MILLIMETER. CONVERTED INCH DIMENSIONS NECESSARILY EXACT. FOLLOWED FROM JEDEC MS-012
Revision 2002
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HIGH PERFORMANCE CURRENT MODE CONTROLLERS 40ns output rise 30ns o

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