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| 型号： | ISL8016IRAJZ-T |
| 厂商： | Intersil |
| 文件页数： | 19/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 20QFN |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 6,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 525kHz ~ 3.9MHz |
| 电流 - 输出： | 6A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-QFN（3x4） |
ISL8016
d 1
F m = ? ---------------- = ------------------------------
( S e + S n ) T s
1 + ------------
L v ( S ) = --------- ----------------------- ---------------------- --------------- , ω p ≈ -------------
V FB R o + R LP ω esr A v ( S ) 1
S H e ( S )
PWM COMPARATOR GAIN F m :
The PWM comparator gain F m for peak current mode control is
given by Equation 6:
(EQ. 6)
v comp
Where, S e is the slew rate of the slope compensation and S n is
given by Equation 7:
S
(EQ. 14)
V o R t 1 + ------- R o C o
ω p
From Equation 14, it is shown that the system is a single order
system, which has a single pole located at ω p before the half
switching frequency. Therefore, a simple type II compensator can
be easily used to stabilize the system.
L
V in – V o
S n = R t --------------------
P
(EQ. 7)
Vo
Where R t is trans-resistance, which is the gain of the current
amplifier.
R 2
C 3
S
S
ω n Q n
where Q n and ω n are given by Q n = – --- , ω n = π f s
CURRENT SAMPLING TRANSFER FUNCTION H e (S):
In current loop, the current signal is sampled every switching
cycle. It has the following transfer function:
2
2
H e ( S ) = ------- + -------------- + 1
(EQ. 8)
ω n
2
π
R 3
V FB
VREF
-
+
GM
VCOMP
R 6
C 6
C 7
Power Stage Transfer Functions
1 + ------------
v o ω esr
F 1 ( S ) = ------ = V in --------------------------------------
d ?
S
S
ω o Q p
------- + -------------- + 1
ω o
1
1
Where ω esr = ------------- , Q p ≈ R o ----- o - , ω o = -----------------
1 + ------
F 2 ( S ) = --- ? - = ----------------------- --------------------------------------
? o V in ω z
R o + R LP
d
S
S
ω o Q p
------- + -------------- + 1
ω o
? 1 + ------------ ? ? 1 + ------------ ?
ω cz1 ? ?
ω cz2 ?
v ? comp
?
A v ( S ) = ---------------- = ------------------- ---------------------------------------------------------
C 6 + C 7
v ? FB
S ? 1 + ---------- ?
ω cp
C + C
Where ω cz1 = -------------- , ω cz2 = -------------- , ω cp = --------------------- 7
Loop bandwidth f c : ? ? 4 --- to ------- ? ? f s
Transfer function F 1 (S) from control to output voltage is:
S
(EQ. 9)
2
2
C
R c C o L P L P C o
Transfer function F 2 (S) from control to inductor current is given
by Equation 10:
S
(EQ. 10)
2
2
FIGURE 41. TYPE II COMPENSATOR
Figure 41 shows the type II compensator and its transfer function
is expressed as follows:
S S
GM (EQ. 15)
S
? ?
1 1 6
R 6 C 6 R 2 C 3 R 6 C 6 C 7
Compensator design goal:
High DC gain
1 1
10
where ω z = ------------- .
Put compensator zero ω cz1 = ( 1to3 ) -------------
R C
1
R o C o
Current loop gain T i (S) is expressed as Equation 11:
T i ( S ) = R t F m F 2 ( S ) H e ( S )
The voltage loop gain with open current loop is:
T v ( S ) = KF m F 1 ( S ) A v ( S )
(EQ. 11)
(EQ. 12)
Gain margin: >10dB
Phase margin: 40°
The compensator design procedure is as follows:
1
o o
Put one compensator pole at zero frequency to achieve high DC
gain, and put another compensator pole at either ESR zero
L v ( S ) = -----------------------
T v ( S )
1 + T i ( S )
K = --------- , V FB
V o
Put compensator zero ω cz2 = ( 5to8 ) -------------
R C
2 π f c V o C o R t
R 6 = --------------------------------
GM ? V FB
The Voltage loop gain with current loop closed is given by
Equation 13:
(EQ. 13)
V FB
Where is the feedback voltage of the voltage
error amplifier. If T i (S)>>1, then Equation 13 can be simplified by
Equation 14:
19
frequency or half switching frequency, whichever is lower. An
optional zero can boost the phase margin. ω CZ2 is a zero due to
R 2 and C 3 .
1
o o
The loop gain T v (S) at cross over frequency of f c has unity gain.
Therefore, the compensator resistance R 6 is determined by:
(EQ. 16)
FN7616.1
May 5, 2011
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