SG1845Y Microsemi Analog Mixed Signal Group, SG1845Y Datasheet - Page 6

• Manufacturer Part Number: SG1845Y
• Description: IC PWM CURRENT MODE 8-DIP
• Manufacturer: Microsemi Analog Mixed Signal Group

Specifications of SG1845Y

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 500kHz
• Duty Cycle: 50%
• Voltage - Supply: 8.3 V ~ 30 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -55°C ~ 125°C
• Package / Case: 8-DIP
• Frequency-max: 500kHz
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption

6
SG1844/SG1845 Series
FIGURE #
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. CURRENT SENSE THRESHOLD vs. ERROR AMPLIFIER OUTPUT
11. OUTPUT SATURATION VOLTAGE vs. OUTPUT CURRENT AND
DROPOUT VOLTAGE vs. TEMPERATURE
OSCILLATOR TEMPERATURE STABILITY
CURRENT SENSE TO OUTPUT DELAY vs. TEMPERATURE
START-UP CURRENT vs. TEMPERATURE
REFERENCE VOLTAGE vs. TEMPERATURE
START-UP VOLTAGE THRESHOLD vs. TEMPERATURE
START-UP VOLTAGE THRESHOLD vs. TEMPERATURE
OSCILLATOR DISCHARGE CURRENT vs. TEMPERATURE
OUTPUT SATURATION VOLTAGE vs. OUTPUT CURRENT AND
TEMPERATURE (SINK TRANSISTOR)
TEMPERATURE (SOURCE TRANSISTOR)
GRAPH / CURVE INDEX
Characteristic Curves
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
C
U R R E N T
P
R O D U C T I O N
- M
O D E
P W M C
D
A T A
FIGURE #
12. OSCILLATOR TIMING CIRCUIT
13. OSCILLATOR FREQUENCY vs. R
FIGURE #
14. CURRENT SENSE SPIKE SUPPRESSION
15. MOSFET PARASITIC OSCILLATIONS
16. BIPOLAR TRANSISTOR DRIVE
17. ISOLATED MOSFET DRIVE
18. ADJUSTABLE BUFFERED REDUCTION OF CLAMP LEVEL WITH
19. EXTERNAL DUTY CYCLE CLAMP AND MULTI-UNIT
20. OSCILLATOR CONNECTION
21. ERROR AMPLIFIER CONNECTION
SOFTSTART
SYNCHRONIZATION
O N T R O L L E R
S
H E E T
Typical Applications Section
Application Information
FIGURE INDEX
T
FOR VARIOUS C
T
Copyright © 2000
Rev. 1.6c