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TPS23750PWP Datasheet(PDF) 4 Page - Texas Instruments

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No. de pieza TPS23750PWP
Descripción Electrónicos  INTEGRATED 100-V IEEE 802.3af PD AND DC/DC CONTROLLER
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TPS23750PWP Datasheet(HTML) 4 Page - Texas Instruments

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ELECTRICAL CHARACTERISTICS
DC/DC CONTROLLER SECTION
TPS23750
TPS23770
SLVS590B – JULY 2005 – REVISED FEBRUARY 2008
Characteristics are for: –40
°C ≤ T
J ≤ 125°C; VDD – VSS = 48 V. VDD, CLASS, and DET referenced to VSS, and all
other pin voltages are referenced to RSN, COM, and RTN shorted together unless otherwise noted.
SEN=MODE=BL=RSP=RTN, FB=VBIAS, SENP=VDD, CTMR = 1000 pF, CVBIAS = 0.1 µF, CVAUX = 0.1 µF,
RFREQ = 150 kΩ, RDET = 24.9 kΩ, RCLASS = 255 Ω, GATE is unloaded, and VBIAS and AUX have no external loads
unless otherwise noted.
RTN = VSS for this section only.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
BIAS SUPPLY (VBIAS)
VBIAS
Output voltage
0
≤ ILOAD ≤ 5 mA
4.60
5.1
5.5
V
AUX SUPPLY (AUX)
VAUX
Supply output voltage
18 V
≤ VVDD – COM ≤ 57 V, 0 mA ≤ IAUX ≤ 10 mA
9
10
11
V
Current limit
VAUX = 0 V
12
23.5
28
mA
OSCILLATOR (FREQ)
RFREQ = 30 kΩ, VCOMP = 3.9 V, MODE = VBIAS, Measure GATE
48.8
49.2
49.5
%
DMAX
Maximum duty cycle
voltage at 50% rising to 50% falling
MODE = VBIAS, VCOMP = 3 V, Measure at GATE
fOSC
Oscillator frequency
RFREQ = 30 kΩ
435
487
565
kHz
RFREQ = 150 kΩ
90
100
110
ERROR AMPLIFIER (FB, COMP)
COMP source current
0
≤ VCOMP ≤ 4 V, FB = RTN, VTMR = 2.5 V
2.5
mA
COMP sink current
1.2 V
≤ VCOMP ≤ VBIAS, VTMR = 2.5 V
2.4
mA
VREF
FB regulation voltage
VCOMP = 2.5 V, VTMR = 2.5 V
1.47
1.50
1.53
V
Open loop voltage gain
1.2 V
≤ VCOMP ≤ 4 V, VTMR = 2.5 V
80
dB
Small signal unity gain bandwidth
VCOMP = 2.5 V, VTMR = 2.5 V
1.5
2
MHz
COMP input resistance
MODE = VBIAS, 1.1 ≤ VCOMP ≤ 4.4, VTMR = 2.5 V
70
100
130
k
FB leakage (source or sink)
0
≤ VFB ≤ VBIAS, VTMR = 2.5 V
1
µA
SOFT START TIMER (TMR)
Source current
TMR charging, VTMR between lower threshold and clamp
38
50
62
µA
Ratio of source/sink current
9
10
11
-
ON duty cycle
MODE = VBIAS, VCOMP = 4.4 V, Second cycle and beyond
8
9.1
10
%
CURRENT SENSE (RSP, RSN, BL)
MODE = VBIAS, VCOMP = 4.2 V, VTMR = 2.5 V, Increase
0.46
0.5
0.54
V
Current limit threshold
VRSP-RSN until the duty cycle switches from 50% to the minimum
MODE = VBIAS, VCOMP = 4.2 V, VTMR = 2.5 V, Increase
0.70
0.765
0.83
V
Fault current threshold
VRSP-RSN until no gate pulses occur
VRSP – RSN = 0.6 V, VAUX = 12 V, MODE = VBIAS, VCOMP = 4.2 V,
VTMR = 2.5 V. Measure 50% of VGATE ↑ to 50% VGATE
Minimum propagation delay, BL floating
40
60
90
tBLNK
Current limit delay
ns
Blanking period (pulse width above minimum), BL connected to
45
70
95
RSN
Blanking period (pulse width above minimum), BL connected to
70
105
140
VBIAS
FREQ = VBIAS, MODE = VBIAS, VCOMP = 4 V,
RSP current
2.5
4
8
µA
VRSP-RSN = 0.4 V, IRSP sourcing
GATE DRIVER (GATE)
5 mA source, VAUX = 12 V
11.9
Output voltage swing
V
5 mA sink, VAUX = 12 V
0.05
Peak source current
VAUX = 12 V, pulse test
0.33
0.58
0.8
A
Peak sink current
VAUX = 12 V, AC test or pulse test with TMR = RSN
0.7
1.0
1.3
A
VOLTAGE TRANSLATOR (SEN, SENP)
VTMR = 2.5 V, Measure with servo loop that includes the error
(SENP - SEN) regulation voltage
1.456
1.492
1.526
V
amplifier
4
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Product Folder Link(s): TPS23750 TPS23770


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