參數(shù)資料
型號(hào): SP6127
英文描述: High-Voltage, Step-Down Controller in TSOT6
中文描述: 高電壓,降壓型控制器在TSOT6
文件頁(yè)數(shù): 5/12頁(yè)
文件大小: 564K
代理商: SP6127
______________________________________________________
GENERAL OVERVIEW
June 26, 2007 SP6127 TSOT-6 PFET Buck Controller
2007 Sipex Corporation
Page 5
Loop Compensation Example 1
- A converter
utilizing a SP6127 has a 3.3
μ
H inductor and a
22
μ
F/5m
ceramic capacitor. Determine
whether Type-III compensation is needed.
From equation (2)
f
ESRZERO
= 1.45MHz. From
equation (3)
f
DBPOLE
= 18.4 kHz. Since the
condition specified in (1) is not met, Type-III
compensation must be used by adding
external components RZ and CZ. Using
equation (4) CZ is calculated to be 34pF (use
33pF). Following the guideline given in table 1,
a 2k
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 the SP6127 has a 3.3
μ
H inductor and
a
220
μ
F,
82m
Aluminum
capacitor.
Determine
compensation is needed.
From equation (2)
f
ESRZERO
= 8.8kHz. From
equation (3)
f
DBPOLE
= 5.9kHz. Since the
condition specified in (1) is not met, Type-III
compensation needs to be used by adding
external components RZ and CZ. Using
equation (4) CZ is calculated 108pF (use 100
pF). Since
f
ESRZERO
/
f
DBPOLE
is approximately 2,
RZ must be set at 40k
.
Electrolytic
Type-III
whether
R1
200k, 1%
R2
SP6127
VFB
+
-
RZ2
200k
CZ2
130pF
CP1
2pF
Error Amplif ier
Vref =0.6V
Vout
RZ
CZ
Figure 1- RZ and CZ in conjunction with internal compensation components form a Type-
III compensation network
Figure 2- Satisfactory frequency response of typical application circuit shown on page 1.
Crossover frequency
f
c is 100kHz with a corresponding phase margin of 60 degrees.
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