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參數(shù)資料
| 型號(hào)： | RT8800PS |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | General Purpose 2/3-Phase PWM Controller for High-Density Power Supply |
| 中文描述： | 通用2/3-Phase PWM控制器，用于高密度電源 |
| 文件頁(yè)數(shù)： | 20/26頁(yè) |
| 文件大小： | 546K |
| 代理商： | RT8800PS |
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RT8800/B
20
DS8800/B-06 March 2007
www.richtek.com
All brand name or trademark belong to their owner respectively
Design Procedure Suggestion
a.Output filter pole and zero (Inductor, output capacitor
value & ESR).
b.Error amplifier compensation & sawtooth wave amp-
litude (compensation network).
Current Loop Setting
a.GM amplifier S/H current (current sense component
DCR, ICOMMON pin external resistor value).
b.Over-current protection trip point (R
ICOMMON1
resistor).
VRM Load Line Setting
a.Droop amplitude (PI pin resistor).
b.No load offset (R
ICOMMON2
)
Power Sequence & SS
DVD pin external resistor and SS pin capacitor.
PCB Layout
a.Sense for current sense GM amplifier input.
b.Refer to layout guide for other items.
Voltage Loop Setting
Design Example
Given:
Apply for four phase converter
V
IN
= 12V
V
CORE
= 1.5V
I
LOAD(MAX)
= 100A
V
DROOP
= 100mV at full load (1m
Ω
Load Line)
OCP trip point set at 35A for each channel (S/H)
DCR = 1m
Ω
of inductor at 25
°
C
L = 1.5
μ
H
C
OUT
= 8000
μ
F with 5m
Ω
equivalent ESR.
Figure 21. Type 2 compensation network of EA
2. Over-Current Protection Setting
Consider the temperature coefficient of copper
3900ppm/
°
C,
EA
RB2
RB1
+
-
15k
C1
12nF
C2 68pF
4.7k
1. Compensation Setting
a. Modulator Gain, Pole and Zero:
From the following formula:
Modulator Gain =V
IN
/V
RAMP
=12/2.4=5 (i.e 14dB)
where V
RAMP
: ramp amplitude of saw-tooth wave
35.6A
I
A
150
330
1.39m
I
A
150
R
DCR
I
L
L
ICOMMON1
L
=
=
Ω
Ω
×
=
×
μ
μ
LC Filter Pole = 1.45kHz and
ESR Zero =3.98kHz
b. EA Compensation Network:
Select R1 = 4.7k, R2 = 15k, C1 = 12nF, C2 = 68pF
and use the Type 2 compensation scheme shown in
Figure 21. By calculation, the F
Z
= 0.88kHz,
F
P
= 322kHz and Middle Band Gain is 3.19 (i.e
10.07dB).
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