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UC3846N Datasheet(PDF) 6 Page - Texas Instruments

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Part No. UC3846N
Description  Current Mode PWM Controller
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

UC3846N Datasheet(HTML) 6 Page - Texas Instruments

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UC1846, UC1847, UC2846
UC2847, UC3846, UC3847
SLUS352C – JANUARY 1997 – REVISED DECEMBER 2015
www.ti.com
Electrical Characteristics (continued)
TA=–55°C to +125°C for UC1846/7; –40°C to +85°C for the UC2846/7; and 0°C to +70°C for the UC3846/7; VIN=15 V,
RT=10k, CT=4.7 nF, TA=TJ (unless otherwise noted)
UC1846/7
UC3846/7
UC2846/7
PARAMETER
TEST CONDITIONS
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
Maximum Differential Input
Pin 1 Open (2); RL
1.1
1.2
1.1
1.2
V
Signal (VPIN 4-VPIN 3)
(Pin 7) = 15 kW
VPIN 1 = 0.5 V, Pin 7
Input Offset Voltage
5
25
5
25
mV
Open(2)
CMRR
VCM = 1 V to 12 V
60
83
60
83
dB
PSRR
VIN = 8 V to 40 V
60
84
60
84
dB
VPIN 1 = 0.5 V, Pin 7
Input Bias Current
–2.5
–10
–2.5
–10
µA
Open(2)
VPIN 1 = 0.5 V, Pin 7
Input Offset Current
0.08
1
0.08
1
µA
Open(2)
Input Common Mode Range
0
VIN-3
0
VIN-3
V
Delay to Outputs
TJ = 25°C
(1)
200
500
200
500
ns
CURRENT LIMIT ADJUST
VPIN 3 = 0 V, VPIN 4 =
Current Limit Offset
0.45
0.5
0.55
0.45
0.5
0.55
V
0 V, Pin 7 Open (2)
VPIN 5 = VREF, VPIN 6
Input Bias Current
–10
–30
–10
–30
µA
= 0 V
SHUTDOWN TERMINAL
Threshold Voltage
250
350
400
250
350
400
mV
Input Voltage Range
0
VIN
0
VIN
V
Minimum Latching Current
(4)3.0
1.5
3.0
1.5
mA
(IPIN1)
Maximum Latching Current
(5)1.5
0.8
1.5
0.8
mA
(IPIN1)
Delay to Outputs
TJ = 25°C
(1)
300
600
300
600
ns
OUTPUT
Collector-Emitter Voltage
40
40
V
Collector Leakage Current
VC = 40 V
(6)
200
200
µA
ISINK = 20 mA
0.1
0.4
0.1
0.4
Output Low Level
V
ISINK = 100 mA
0.4
2.1
0.4
2.1
ISOURCE = 20 mA
13
13.5
13
13.5
Output High Level
V
ISOURCE = 100 mA
12
13.5
12
13.5
CL = 1 nF, TJ = 25°C
Rise Time
50
300
50
300
ns
(1)
CL = 1 nF, TJ = 25°C
Fall Time
50
300
50
300
ns
(1)
UNDERVOLTAGE LOCKOUT
Start-Up Threshold
7.7
8.0
7.7
8.0
V
Threshold Hysteresis
0.75
0.75
V
TOTAL STANDBY CURRENT
Supply Current
17
21
17
21
mA
(4)
Current into Pin 1 ensured to latch circuit in shutdown state.
(5)
Current into Pin 1 ensured not to latch circuit in shutdown state.
(6)
Applies to UC1846/UC2846/UC3846 only due to polarity of outputs.
6
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Copyright © 1997–2015, Texas Instruments Incorporated
Product Folder Links: UC1846 UC1847 UC2846 UC2847 UC3846 UC3847


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