參數(shù)資料
型號(hào)： FAN5038M
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Current-Mode SMPS Controller
中文描述： SWITCHING CONTROLLER, PDSO16
封裝： SOIC-16
文件頁(yè)數(shù)： 8/15頁(yè)
文件大?。?/td> 84K
代理商： FAN5038M
FAN5038
PRODUCT SPECIFICATION
8
REV. 1.0.2 7/6/00
Table1. Bill of Materials for a FAN5038 DSP Application
Reference
C1, C9, C11
Manufacturer Part #
Sanyo
10TPB100M
Sanyo
6TPB150M
Panasonic
ECU-V1C105ZFX
Panasonic
ECU-V1H101JCG
Panasonic
ECU-V1C104ZFX
Panasonic
ECU-V1C103ZFX
Motorola
MBRS835
Fairchild
MBRS320
Any
Fairchild
NDS8425
Fairchild
FDV301N
Fairchild
MJD200
Dale
WSL2010R015FRE4
Any
Any
Any
Any
Any
Any
Fairchild
FAN5038M
Qty.
3
Description
100μF, 10V Capacitor
Requirements and Comments
= 1.9A
I
RMS
C2, C10
2
150μF, 6V Capacitor
ESR
≤
55m
C3, C5
2
1μF, 16V Capacitor
C4
1
100pF Capacitor
5%, COG
C6, C8
2
100nF, 16V Capacitor
C7
1
10nF, 16V Capacitor
D1
1
8A Schottky Diode
D2
1
3A Schottky Diode
L1
Q1
1
1
4.7μH, 4A Inductor
N-Channel MOSFET
DCR ~ 2m
R
DS(ON)
= 25m
@ V
GS
= 4.5V
Q2
1
N-Channel MOSFET
Q3
1
NPN
40V, 5A
R1-2
2
15m
, 1/2W
R3
R4
1
1
3
1
1
1
1
2K
100K
10K
4.7K
6.49K
12K
DC/DC Controller
R5, R8, R10
R7
R8
R9
U1
Application Information
The FAN5038 contains a precision trimmed low TC voltage
reference, a constant-on-time architecture controller, a high
current switcher output driver, a low offset op-amp, and
switches for selecting various output modes. The block dia-
gram in Figure 2 shows how the FAN5038 in combination
with the external components achieves a dual power supply
for DSP power.
Switch-Mode Control Loop
The main control loop for the switch-mode converter consists
of a current conditioning amplifier and one of the two voltage
conditioning amplifiers that take the raw voltage and current
information from the regulator output, compare them against
the precision reference and present the error signal to the
input of the constant-on-time oscillator. The two voltage
conditioning amplifiers act as an analog switch to select
between the internal resistor divider network (set for 3.5V)
or an external resistor divider network (adjustable for 1.5V
to 3.6V.) The switch-mode select pin determines which of
the two amplifiers is selected. The current feedback signals
come across the Iout sense resistor to the IFBH and IFBL
inputs of the FAN5038. The error signals from both the cur-
rent feedback loop and the voltage feedback loop are
summed together and used to control the off-time duration of
the oscillator. The current feedback error signal is also used
as part of the FAN5038 short-circuit protection.
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