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PDF SP6126 Data sheet ( Hoja de datos )
| Número de pieza | SP6126 | |
| Descripción | Step Down Controller | |
| Fabricantes | Sipex Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP6126 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Solved by
SP6126
TM
High-Voltage, Step Down Controller in TSOT6
www.DataSheet4U.com
FEATURES
Wide 4.5V – 29V Input Voltage Range
Internal Compensation
Built-in High Current PMOS Driver
Adjustable Overcurrent Protection
Internal soft-start
600kHz 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
SP6126
6 PinTSOT
1 23
VIN GATE VDR
DESCRIPTION
The SP6126 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 SP6126 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
C7
0.1uF
VIN
1
Vin
Gate
2
Rs=1k
LX
Q1
Si2343DS
L1, IHLP-2525CZ
6.8uH, 60mOhm, 4.5A
SP6126
3
VDR
6
GND
5
4
VFB
Ds RZ
MBRA340T3G 2K
CZ
62pF
R1
200k, 1%
R2
44.2k, 1%
SHDN
D1 1N4148
High=Of f
C1
10uF
12V
GND
VOUT
C4
22uF
3.3V
0-2.0A
GND
Mar 29-07 RevD
SP6126: TSOT-6 PFET Buck Controller
1
2007 Sipex Corporation
1 page  
Loop Compensation Example 1- A converter
utilizing a SP6126 has a 6.8uH inductor and
a 22uF/5mΩ ceramic capacitor. Determine
whether Type-III compensation is needed.
From equation (2) fESRZERO = 1.45MHz. From
equation (3) fDBPOLE = 13 kHz. 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 61.2pF (use 62
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.
GENERAL OVERVIEW
Loop Compensation Example 2- A converter
utilizing a SP6126 has a 6.8uH inductor and
a 150uF, 82mΩ Aluminum Electrolytic
capacitor. Determine whether Type-III
compensation is needed.
From equation (2) fESRZERO = 13kHz. From
equation (3) fDBPOLE = 5 kHz. 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 160pF (use
150 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 80kHz with a corresponding phase margin of 65 degrees.
Mar 29-07 RevD
SP6126: TSOT-6 PFET Buck Controller
5
2007 Sipex Corporation
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
SP6126 Efficiency versus Iout, Vin=24V,Ta=25C
90
80
70
Vout=3.3V
Vout=5V
60
50
0.0 0.5 1.0 1.5 2.0 2.5
Iout (A)
Figure 8- Efficiency at VIN = 24 V
SP6126 Efficiency versus Iout, Vin=5V,Ta=25C
100
Vout=2.5V
Vout=3.3V
95
90
85
80
75
70
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Iout (A)
Figure 9- Efficiency at VIN = 5 V
Mar 29-07 RevD
SP6126: TSOT-6 PFET Buck Controller
11
2007 Sipex Corporation
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SP6126.PDF ] | |
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