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FAN5037MX Datenblatt(PDF) 6 Page - Fairchild Semiconductor

Teilenummer FAN5037MX
Bauteilbeschribung  Adjustable Switching Regulator Controller
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5037MX Datenblatt(HTML) 6 Page - Fairchild Semiconductor

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FAN5037
PRODUCT SPECIFICATION
6
REV. 1.0.3 9/26/01
Table1. Bill of Materials for a FAN5037 3.3V, 13A Application
Qty.
Reference
Manufacturer
Part Order #
Description
Requirements
and Comments
3
C1, C7-8
Any
100nF, 25V Capacitor
3
C2-4
Sanyo
10MV1200GX
1200µF, 10V Aluminum Capacitor
IRMS = 2A , See Equation
(2) in Applications
1
C5
Any
1µF, 25V Capacitor
1
C6
Any
180pF, 50V Capacitor
C0G
6
C9-14
Sanyo
6MV1500GX
1500µF, 6.3V Aluminum Capacitor
ESR = 44m
1
R1
Any
47.5
1
R2
Any
4.75
1
R3
N/A
5.2m
Ω, 1W Resistor
PCB Trace Resistor, see
Equation (3) Applications
1
R4
Any
3.48K
1
R5
Any
2K
1
D1
Motorola
MBRB1545CT
15A, 45V Schottky
1
D2
Fairchild
MMBD4148
Signal Diode
1
D3
Motorola
1N4735A
6.2V Zener
1
Q1
Fairchild
FDB6030L
30V, 14m
Ω Logic Level MOSFET
Optional
L1
Any
2.5µH Inductor
ISAT > 8A
1
L2
Any
4.7µH Inductor
ISAT > 13A
1
U1
Fairchild
FAN5037M
PWM Controller
Application Information
The FAN5037 contains a precision trimmed zero TC voltage
reference, a constant-on-time architecture controller, a high
current output driver, and a low offset error amp. The
detailed block diagram in Figure 1 shows how the FAN5037
works together with external components to achieve a high-
performance switching power supply.
Switch-Mode Control Loop
The main control loop for the switch-mode converter consists
of a current conditioning amplifier and a voltage conditioning
amplifier. The voltage amplifier compares the voltage from the
internal reference with the converter’s output voltage divided
by an external resistor divider. The current amplifier senses the
current by comparing the voltages at the IFBH and IFBL pins,
which are attached to either side of the current sense resistor.
The signals from the voltage and current amplifiers are
summed together, the result being used to control the off-time
of the oscillator. The current feedback signal is also used as
part of the FAN5037 short-circuit protection.
High Current Output Drivers
The FAN5037 high current output driver (DRV) contains
high speed bipolar power transistors configured in a
push-pull configuration. The output driver is capable of sup-
plying 0.5A of current in less than 100ns. The driver’s power
and ground are separated from the overall chip power and
ground for added switching noise immunity.
Internal Reference
The reference in the FAN5037 is a precision band-gap type
reference. Its temperature coefficient is trimmed to provide a
near zero TC.
Constant-On-Time Oscillator
The FAN5037 switch-mode oscillator is designed as a fixed
on-time, variable off-time oscillator. The constant-on-time
oscillator consists of a comparator, an external capacitor, a
fixed current source, a variable current source, and an analog
switch that selects between two threshold voltages for the
comparator. The external timing capacitor is alternately


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