參數(shù)資料
型號(hào)： IRU3033CS
廠商： International Rectifier
英文描述： 8-PIN PWM SWITCHER AND LINEAR CONTROLLER IC
中文描述： 8引腳的PWM切換器和線性控制器芯片
文件頁數(shù)： 10/12頁
文件大?。?/td> 76K
代理商： IRU3033CS
IRU3033
10
Rev. 1.7
07/17/02
www.irf.com
Frequency Calculation
The IRU3033 frequency of operation is calculated using
the following formula:
Fs =
[
(Vo
×
(1 - D)
×
ESR)
]
/ (L
×
Vo) (MHz)
Where:
Vo = Output voltage (V)
D = Duty cycle
ESR = Output capacitor ESR (V)
L = Output inductance (
μ
H)
Vo = Output ripple voltage (V)
For our example:
D
≈
(Vo + Vf) / V
IN
Where:
Vf = Forward voltage drop of the Schottky diode.
The ESR=18m
for 2 of the Sanyo 1500
μ
F, 6MV1500GX
caps. If L=3.5
μ
H then, Fs is calculated as follows:
D = (3.38 + 0.5) / 5 = 0.78
For example, if Rt=1K and R
B
=422K, then the output
ripple is:
The advantage of fixed output ripple is that when the
output voltage changes from 2V to 3.5V, the ripple volt-
age remains the same which is important in meeting the
Intel maximum tolerance specification.
Switcher Output Voltage Setting
The output voltage of the switcher can be set using the
following equations:
Assuming, Vo=3.38V and the selected output ripple is
≈
1.3%(44mV) of the output voltage, a set of equations
are derived that selects the resistor divider and the hys-
teresis resistor.
Assuming, Rt=1K
, 1%:
Where:
Rt = Top resistor of the resistor divider.
R
H
= Hysteresis resistor connected between pins 3
and 4 of the IRU3033.
Vo = Selected output ripple (typically 1% to 2% of
output voltage).
Assuming,
Vo=44mV:
Select R
H
= 249K
, 1%
The bottom resistor of the divider is then calculated us-
ing the following equations:
Where:
R
B
= Bottom resistor of the divider
V
REF
= 1.25V typical
Vo
2
Select R
B
= 576
, 1%
IR WORLD HEADQUARTERS:
233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information
Data and specifications subject to change without notice. 02/01
Vo = (1/422)
×
11 = 26mV
R
H
= (11
×
Rt) /
V
R
H
= (11
×
1000) / 0.044 = 250K
R
B
= Rt / X
X =
[
(Vo + )/V
REF
]
- 1
X =
[
(3.38 + 0.044
]
- 1 = 1.72
2
R
B
= 1000 / 1.72 = 580
Fs = (3.5
×
0.044)
Fs = 87KHz
[
(3.38
(1 - 0.78)
×
0.018)
]
相關(guān)PDF資料
PDF描述
IRU3046 DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
IRU3046CF DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
IRU3047 DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
IRU3047CW DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
IRU3048 DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER
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