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UC3845BD1 Datasheet(PDF) 4 Page - STMicroelectronics

Part # UC3845BD1
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC3845BD1 Datasheet(HTML) 4 Page - STMicroelectronics

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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 V PIN2 =0.
4. Gain defined as :
∆ VPIN1
A=
; 0
≤ VPIN3 ≤ 0.8 V
∆ VPIN3
5. Adjust Vi above the start threshold before setting at 15 V.
ELECTRICAL CHARACTERISTICS (continued)
Symbo l
Parameter
T est Cond iti ons
UC284XB
UC384XB
Un it
Min. Typ. Max. Mi n. Typ. Max.
OUTPUT SECTION
VOL
Output Low Level
ISINK = 20mA
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
°CCL = 1nF (2)
50
150
50
150
ns
tf
Fall Time
Tj =25
°CCL = 1nF (2)
50
150
50
150
ns
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
X842B/4B
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
9
10
11
8.5
10
11.5
V
X843B/5B
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
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
4/15


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