TL2843B-Q1 Datasheet, PDF (5/16 Pages) Texas Instruments – HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLER

TL2843B-Q1
www.ti.com
SLVSAE2A – JULY 2010 – REVISED FEBRUARY 2012
ERROR-AMPLIFIER SECTION ELECTRICAL CHARACTERISTICS
V_CC = 15 V⁽¹⁾, R_T = 10 kΩ, C_T = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
PARAMETER
TEST CONDITIONS
TL284xB
MIN TYP⁽²⁾
UNIT
MAX
Feedback input voltage
COMP = 2.5 V
2.45
2.5
2.55 V
Input bias current
–0.3
–1 μA
Open-loop voltage amplification V_O = 2 V to 4 V
Gain-bandwidth product
65
90
0.7
1
dB
MHz
Supply-voltage rejection ratio
Output sink current
V_CC = 12 V to 25 V
VFB = 2.7 V, COMP = 1.1 V
60
70
dB
2
6
mA
Output source current
VFB = 2.3 V, COMP = 5 V
–0.5
–0.8
mA
High-level output voltage
Low-level output voltage
VFB = 2.3 V, R_L = 15 kΩ to GND
VFB = 2.7 V, R_L = 15 kΩ to GND
5
6
V
0.7
1.1 V
(1) Adjust V_CC above the start threshold before setting it to 15 V.
(2) All typical values are at T_J = 25°C.
CURRENT-SENSE SECTION ELECTRICAL CHARACTERISTICS
V_CC = 15 V⁽¹⁾, R_T = 10 kΩ, C_T = 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
PARAMETER
TEST CONDITIONS
TL284xB
MIN TYP⁽²⁾
UNIT
MAX
Voltage amplification^{(3) (4)}
2.85
3
3.15 V/V
Current-sense comparator threshold⁽³⁾
COMP = 5 V
0.9
1
1.1 V
Supply-voltage rejection ratio⁽³⁾
V_CC = 12 V to 25 V
70
dB
Input bias current
–2
–10 μA
Delay time to output⁽⁵⁾
VFB = 0 V to 2 V
150
300 ns
(1) Adjust V_CC above the start threshold before setting it to 15 V.
(2) All typical values are at T_J = 25°C.
(3) Measured at the trip point of the latch, with VFB at 0 V.
(4) Measured between I_SENSE and COMP, with the input changing from 0 V to 0.8 V.
(5) Specified by design. Not production tested.
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