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UC2844BD1 View Datasheet(PDF) - STMicroelectronics

Part Name
Description
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UC2844BD1 Datasheet PDF : 15 Pages
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UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
OUTPUT SECTION
VOL Output Low Level
Test Conditions
ISINK = 20mA
UC284XB
UC384XB
Unit
Min. Typ. Max. Min. Typ. Max.
0.1 0.4
0.1 0.4 V
ISINK = 200mA
1.6 2.2
1.6 2.2 V
VOH Output High Level
ISOURCE = 20mA
13 13.5
13 13.5
V
ISOURCE = 200mA
12 13.5
12 13.5
V
VOLS UVLO Saturation
VCC = 6V; ISINK = 1mA
0.1 1.1
0.1 1.1 V
tr
Rise Time
Tj = 25°C CL = 1nF (2)
tf
Fall Time
Tj = 25°C CL = 1nF (2)
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
X842B/4B
50 150
50 150
50 150 ns
50 150 ns
15 16 17 14.5 16 17.5 V
X843B/5B
7.8 8.4 9.0 7.8 8.4 9.0 V
Min Operating Voltage
After Turn-on
X842B/4B
X843B/5B
9 10 11 8.5 10 11.5 V
7.0 7.6 8.2 7.0 7.6 8.2 V
PWM SECTION
Maximum Duty Cycle
X842B/3B
94 96 100 94 96 100 %
X844B/5B
47 48 50 47 48 50 %
Minimum Duty Cycle
0
0%
TOTAL STANDBY CURRENT
Ist
Start-up Current
Vi = 6.5V for UCX843B/45B
0.3 0.5
0.3 0.5 mA
Vi = 14V for UCX842B/44B
0.3 0.5
0.3 0.5 mA
Ii
Operating Supply Current VPIN2 = VPIN3 = 0V
12 17
12 17 mA
Viz
Zener Voltage
Ii = 25mA
30 36
30 36
V
Notes :
1. Max package power dissipation limits must be respected; low duty cycle pulse techniques are used during test maintain Tj as
close to Tamb as possible.
2. These parameters, although guaranteed, are not 100% tested in production.
3. Parameter measured at trip point of latch with VPIN2 = 0.
4. Gain defined as :
A = VPIN1 ; 0 VPIN3 0.8 V
VPIN3
5. Adjust Vi above the start threshold before setting at 15 V.
4/15
 

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