SG1526 Microsemi Corporation, SG1526 Datasheet
SG1526
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SG1526 Summary of contents
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... DESCRIPTION The SG1526 is a high performance monolithic pulse width modulator circuit designed for fixed-frequency switching regulators and other power control applications. Included in an 18-pin dual-in-line package are a temperature compensated voltage reference, sawtooth oscillator, error amplifier, pulse width modulator, pulse metering and steering logic, and two low impedance power drivers ...
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... Reference Load Current ........................................... Oscillator Frequency Range .............................. Oscillator Timing Resistor .................................. Note 2. Range over which the device is functional. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1526 with - - SG3526 with temperatures equal to the ambient temperature.) ...
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... 1000pF 1000pF L SHUTDOWN = 0.4V Note . Note Note 9. These parameters, although guaranteed over the recom- mended operating conditions, are not tested in production. 3 SG1526/SG2526/SG3526 SG1526/2526 SG3526 Min. Typ. Max. Min. Typ. Max 0.5 1.0 0 1.0 350 350 3.0 3.5 3.0 ...
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... AND 4/90 Rev 1.1 2/94 Copyright 1994 FIGURE 2. REFERENCE TEMPERATURE STABILITY FIGURE 5. OSCILLATOR FREQUENCY TEMPERATURE STABILITY 4 SG1526/SG2526/SG3526 FIGURE 3. REFERENCE SHORT CIRCUIT CURRENT FIGURE 6. OUTPUT DRIVER DEADTIME VS. R VALUE D L INFINITY Microelectronics Inc. 11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570 ...
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... FIGURE 9. ERROR AMPLIFIER OPEN LOOP GAIN VS. FREQUENCY FIGURE 12. COMPARATOR INPUT TO DRIVER OUTPUT DELAY FIGURE 15. OUTPUT SUPPLY SATURATION VOLTAGE VS. I SINK 5 SG1526/SG2526/SG3526 FIGURE 10. SOFTSTART TIME CONSTANT VS FIGURE 13. SHUTDOWN INPUT TO DRIVER OUTPUT DELAY FIGURE 16. STANDBY CURRENT VS. SUPPLY VOLTAGE SINK L INFINITY Microelectronics Inc. ...
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... UNDERVOLTAGE LOCKOUT The undervoltage lockout circuit protects the SG1526 and the power devices it controls from inadequate supply voltage too low, the circuit disables the output drivers and holds the RESET pin LOW. This prevents spurious output pulses IN while the control circuitry is stabilizing, and holds the soft-start timing capacitor in a discharged state ...
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... The SG1526 can be synchronized to an external logic clock by programming the oscillator to free-run at a frequency 10% slower than the sync frequency. A periodic LOW logic pulse approximately 0.5µSec wide at the SYNC pin will then lock the oscillator to the external frequency ...
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... APPLICATION INFORMATION OUTPUT DRIVERS The totem-pole output drivers of the SG1526 are designed to source and sink 100mA continuously and 200mA peak. Loads can be driven either from the output pins 13 and 16, or from the +V outputs as a function of load current are found in Figures 14 and 15. ...
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... LEADLESS CHIP CARRIER SG1526L L- PACKAGE Note 1. Contact factory for JAN and DESC product availability. 2. All parts are viewed from the top. 4/90 Rev 1.1 2/94 Copyright 1994 SG1526/SG2526/SG3526 (See Notes Below) Ambient Connection Diagram Temperature Range - 125 C - 125 C - COMPENSATION ...