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PDF SP6125 Data sheet ( Hoja de datos )
| Número de pieza | SP6125 | |
| Descripción | Step Down Controller | |
| Fabricantes | Sipex Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP6125 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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Solved by
SP6125
TM
High-Voltage, Step Down Controller in TSOT6
FEATURES
Wide 4.5V – 29V Input Voltage Range
Internal Compensation
Built-in High Current PMOS Driver
Adjustable Overcurrent Protection
Internal soft-start
300kHz Constant Frequency Operation
0.6V Reference Voltage
1% output setpoint accuracy
Lead Free, RoHS Compliant Package:
Small 6 pin TSOT
LX GND FB
6 54
SP6125
6 PinTSOT
1 23
VIN GATE VDR
DESCRIPTION
The SP6125 is a PWM controlled step down (buck) voltage mode regulator with VIN feedforward and
internal Type-II compensation. It operates from 4.5V to 29V, making is suitable for 5V, 12V, and 24V
applications. By using a PMOS driver, this device is capable of operating at 100% duty cycle. The
high side driver is designed to drive the gate 5V below VIN. The programmable overcurrent
protection is based on high-side MOSFET’s ON resistance sensing and allows setting the
overcurrent protection value up to 300mV threshold (measured from VIN-LX). The SP6125 is
available in a space-saving 6-pin TSOT package making it the smallest controller available capable
of operating from 24VDC supplies.
TYPICAL APPLICATION CIRCUIT
C6
0.1uF
Q1
2 FDS4685
1
Vin
Gate
Rs 2k
LX
L1, IHLP-2525CZ
8.2uH, 68mOhm, 4A
SP6125
3
VDR
6
Ds RZ
MBRA340T3G 2K
R1
200k, 1%
GND
5
4
VFB
CZ
100pF
R2
44.2k, 1%
SHDN
D1 1N4148
High=Of f
C1
4.7uF
C4
22uF
VIN
C2 24-29 V
4.7uF
GND
VOUT
C5
22uF
3.3V
0-3A
GND
Mar22-07 RevC
SP6125: TSOT-6 PFET Buck Controller
1
2007 Sipex Corporation
1 page  
SP6125
General Overview
Vout
CP1 2pF
CZ2 130pF
RZ2 200k
Vref =0.6V
Error Amplif ier
VFB
RZ
CZ R1
200k, 1%
R2
Figure 1- RZ and CZ in conjunction with internal
compensation components form a Type-III compensation
Loop Compensation Example 1- A converter
utilizing a SP6125 has a 8.2uH inductor and
two 22uF/5mΩ ceramic capacitor.
Determine whether Type-III compensation is
needed.
From equation (2) fESRZERO = 1.45MHz. From
equation (3) fDBPOLE = 8.4kHz. Since the
condition specified in (1) is not met, Type-III
compensation has to be used by adding
external components RZ and CZ. Using
equation (4) CZ is calculated 95pF (use 100
pF). Following the guideline given in table 1,
a 2kΩ RZ should be used.
The steps followed in example 1 were used
to compensate the typical application circuit
shown on page 1. Satisfactory frequency
response of the circuit, seen in figure 2,
validates the above procedure.
Loop Compensation Example 2- A converter
utilizing a SP6125 has a 8.2uH inductor and
a 150uF, 82mΩ Aluminum Electrolytic
capacitor. Determine whether Type-III
compensation is needed.
From equation (2) fESRZERO = 13kHz. From
equation (3) fDBPOLE = 4.5kHz. Since the
condition specified in (1) is not met, Type-III
compensation has to be used by adding
external components RZ and CZ. Using
equation (4) CZ is calculated 175pF (use
180 pF). Since fESRZERO ÷ fDBPOLE is
approximately 3, RZ has to be set at 30kΩ.
Figure 2- Satisfactory frequency response of typical application circuit shown on page 1.
Crossover frequency fc is about 35kHz with a corresponding phase margin of 60 degrees. The
two sets of curves, which are essentially identical, correspond to load current of 1A and 2.5A.
Mar22-07 RevC
SP6125: TSOT-6 PFET Buck Controller
5
2007 Sipex Corporation
5 Page 
PACKAGE: 6 PIN TSOT
Mar22-07 RevC
SP6125: TSOT-6 PFET Buck Controller
11
2007 Sipex Corporation
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SP6125.PDF ] | |
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