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Error-Amplifier Section Electrical Characteristics
Current-Sense Section Electrical Characteristics
TL284xB , TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610B – AUGUST 2006 – REVISED JULY 2007
V
CC
= 15 V
(1)
, R
T
= 10 k Ω , C
T
= 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
TL284xB TL384xB
PARAMETER TEST CONDITIONS UNIT
MIN TYP
(2)
MAX MIN TYP
(2)
MAX
Feedback input voltage COMP = 2.5 V 2.45 2.5 2.55 2.42 2.5 2.58 V
Input bias current –0.3 –1 –0.3 –2 μ A
Open-loop voltage
V
O
= 2 V to 4 V 65 90 65 90 dB
amplification
Gain-bandwidth product 0.7 1 0.7 1 MHz
Supply-voltage rejection ratio V
CC
= 12 V to 25 V 60 70 60 70 dB
Output sink current VFB = 2.7 V, COMP = 1.1 V 2 6 2 6 mA
Output source current VFB = 2.3 V, COMP = 5 V –0.5 –0.8 –0.5 –0.8 mA
VFB = 2.3 V,
High-level output voltage 5 6 5 6 V
R
L
= 15 k Ω to GND
VFB = 2.7 V,
Low-level output voltage 0.7 1.1 0.7 1.1 V
R
L
= 15 k Ω to GND
(1) Adjust V
CC
above the start threshold before setting it to 15 V.
(2) All typical values are at T
J
= 25 ° C.
V
CC
= 15 V
(1)
, R
T
= 10 k Ω , C
T
= 3.3 nF, over recommended operating free-air temperature range (unless otherwise specified)
TL284xB TL384xB
PARAMETER TEST CONDITIONS UNIT
MIN TYP
(2)
MAX MIN TYP
(2)
MAX
Voltage amplification
(3) (4)
2.85 3 3.15 2.85 3 3.15 V/V
Current-sense comparator
COMP = 5 V 0.9 1 1.1 0.9 1 1.1 V
threshold
(3)
Supply-voltage rejection
V
CC
= 12 V to 25 V 70 70 dB
ratio
(3)
Input bias current –2 –10 –2 –10 μ A
Delay time to output VFB = 0 V to 2 V 150 300 150 300 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.
6
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