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LM3000 Scheda tecnica(PDF) 11 Page - Texas Instruments

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Il numero della parte LM3000
Spiegazioni elettronici  Dual Synchronous Emulated Current-Mode Controller
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

LM3000 Scheda tecnica(HTML) 11 Page - Texas Instruments

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VIN
4
5.2V
REGS
VDD
VDR
12
5
gm
BIAS
EN1
EN2
VBG
0.6V
CLOCK/
PLL
FREQ/
SYNC
CLKOUT
18
23
17
28
VSW1
+
-
20 éA
+
+
+
-
+
+
+
-
8.5 éA
SS2
TRK2
TRK1
SS1
RAMP1
RAMP2
ILIM1
ILIM2
PGND2
PGND1
VSW2
IFREQ
IVIN
ISLOPE1
ISLOPE2
CURRENT
EMULATION
AND
SLOPE
COMPENSATION
REF1
REF2
9
32
8
7
1
2
+
-
SYSTEM_CLOCK
VSW1
VSW2
PWM LOGIC
DUTY CYCLE
AND
DRIVER
CONTROL
EN1
EN2
SYSTEM_REF
REF1
REF2
VOUT1, VOUT2
MONITOR
EN1
EN2
SYSTEM_REF
VCB1
HG1
LG1
VSW1
PGND1
COMP1
FB1
FB1
EA1_GND
EA2_GND
FB2
FB2
COMP2
PGOOD1
PGOOD2
VCB2
HG2
VDR
LG2
20
19
22
21
30
11
10
31
6
15
14
13
16
3
25
26
27
24
VSW2
VDR
++
+
+
RDSON
SENSING
ASEN(s)
EN1
or FAULT
EN2
or
FAULT
20 éA
PGND2
OC1
OC2
RDSON
SENSING
ASEN(s)
LG2
LG2
LG1
LG1
FAULT
8.5 éA
250Ö
250Ö
SGND
29
1 kÖ 1 kÖ
+
-
+
-
gmn
FB2
FB1
gm
gm
REF2
REF1
LM3000
www.ti.com
SNVS612A – JULY 2009 – REVISED JULY 2009
Block Diagram
Functional Description
THEORY OF OPERATION
The LM3000 is a dual emulated current-mode PWM synchronous controller. Unlike traditional peak current-mode
controllers which sense the current while the high-side FET is on, the LM3000 senses current while the low-side
FET is on. It then emulates the peak current waveform and uses that information to regulate the output voltage.
The blanking time when the high-side FET first turns on that is normally associated with high-side sensing is not
needed, allowing high-side ON pulses as low as 50 ns. The LM3000 therefore has both excellent line transient
response and the ability to regulate low output voltages from high input voltages.
Copyright © 2009, Texas Instruments Incorporated
Submit Documentation Feedback
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