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LM5575Q0MH/NOPB bảng dữ liệu(PDF) 9 Page - Texas Instruments

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tên linh kiện LM5575Q0MH/NOPB
Giải thích chi tiết về linh kiện  Simple Switcher 75-V, 1.5-A Step-Down Switching Regulator
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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LM5575Q0MH/NOPB bảng dữ liệu(HTML) 9 Page - Texas Instruments

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background image
FB
SW
RT
VIN
BST
SD
5V
S
R
Q
Q
AGND
IS
CLK
+
SS
PRE
3
2
10
6
5
4
7
8
11
9
12
1
SD
Ir
LM5575
SHUTDOWN
STANDBY
7V
REGULATOR
SYNC
SYNC
OSCILLATOR
RAMP
OUT
PGND
CLK
CLK
COMP
ERROR
AMP
R3
21k
C3
470p
C11
330p
R7
10
C9
10
C10
120
R6
1.65k
R5
5.11k
L1
47 2H
C7
0.022
C8
0.47
D1
CMSH3-100
13
15
14
16
THERMAL
SHUTDOWN
UVLO
UVLO
CLK
DIS
VCC
LEVEL
SHIFT
DRIVER
1.225V
1.225V
0.7V
0.7V
R4
49.9k
C5
0.01
C6
open
R2
OPEN
C12
OPEN
C4
0.01
C2
1.0
C1
1.0
R1
OPEN
7V ± 75V
VIN
VIN
2.1V
PWM
C_LIMIT
10 2A
5 2A
VIN
TRACK
SAMPLE
and
HOLD
1V/A
RAMP GENERATOR
Ir = (10 2A x (VIN ± VOUT))
+ 50 2A
LM5575-Q1
www.ti.com
SNOSB23C – OCTOBER 2008 – REVISED DECEMBER 2014
8 Detailed Description
8.1 Overview
The LM5575-Q1 switching regulator features all of the functions necessary to implement an efficient high-voltage
buck regulator using a minimum of external components. This easy-to-use regulator integrates a 75-V N-Channel
buck switch with an output current capability of 1.5 Amps. The regulator control method is based on current
mode control utilizing an emulated current ramp. Peak current mode control provides inherent line voltage feed-
forward, cycle-by-cycle current limiting, and ease-of-loop compensation. The use of an emulated control ramp
reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable processing of very small duty
cycles necessary in high-input voltage applications. The operating frequency is user programmable from 50 kHz
to 500 kHz. An oscillator synchronization pin allows multiple LM5575-Q1 regulators to self-synchronize or be
synchronized to an external clock. The output voltage can be set as low as 1.225 V. Fault protection features
include, current limiting, thermal shutdown and remote shutdown capability. The device is available in the
TSSOP-16 package featuring an exposed pad to aid thermal dissipation.
8.2 Functional Block Diagram
Figure 8. Typical Application Circuit and Block Diagram
The functional block diagram and typical application of the LM5575-Q1 are shown in Figure 8. The LM5575-Q1
can be applied in numerous applications to efficiently step-down a high, unregulated input voltage. The device is
well suited for telecom, industrial and automotive power bus voltage ranges.
8.3 Feature Description
8.3.1 Shutdown and Standby
The LM5575-Q1 contains a dual-level Shutdown (SD) circuit. When the SD pin voltage is below 0.7 V, the
regulator is in a low-current shutdown mode. When the SD pin voltage is greater than 0.7 V but less than 1.225
V, the regulator is in standby mode. In standby mode, the VCC regulator is active but the output switch is
disabled. When the SD pin voltage exceeds 1.225 V, the output switch is enabled and normal operation begins.
An internal 5-µA pullup current source configures the regulator to be fully operational if the SD pin is left open.
Copyright © 2008–2014, Texas Instruments Incorporated
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Product Folder Links: LM5575-Q1


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