參數(shù)資料
型號: PCA5007
廠商: NXP Semiconductors N.V.
英文描述: Pager baseband controller
中文描述: 傳呼機(jī)基帶控制器
文件頁數(shù): 65/112頁
文件大小: 604K
代理商: PCA5007
1998 Oct 07
65
Philips Semiconductors
Product specification
Pager baseband controller
PCA5007
Table 54
Ripples in normal operating mode
6.22.6
S
WITCHING FREQUENCIES
Depending on the load and more importantly on the battery voltage the controller uses different on and off times for the
NMOS and PMOS transistors. This results in different switching frequencies. If the 6 MHz ring oscillator is trimmed to
6 MHz (see Section 6.12) the switching frequency is 120 kHz
f
sw
400 kHz. A typical frequency behaviour is shown in
Fig.37.
MODE
STANDBY
NORM
t
n
= 6.51
μ
s
t
n
= 1
μ
s, 2
μ
s, 4
μ
s
0.2
D
p
0.73
t
n
= 6.51
μ
s
t
n
= 1
μ
s, 2
μ
s, 4
μ
s
t
n
= 6.51
μ
s
t
n
= 1
μ
s, 2
μ
s, 4
μ
s
I
peak
V
BAT
t
n
L
---
×
=
I
ripple
V
BAT
t
n
L
---
×
=
I
L(mean)
I
L
D
p
------
=
V
I
--------------
t
n
×
C
o
=
V
I
--------------
t
n
×
C
o
=
V
ripple
V
----------L
t
n
×
ESR
×
=
V
ripple
I
mean
1
2
V
----------L
t
n
×
×
+
ESR
×
=
Fig.37 Switching frequencies.
L = 470
μ
H; SRL = 5
; C
o
= 4.7
μ
F; ESR = 0.5
.
(1) V
BAT
= 1.5 V.
(2) V
BAT
= 1.2 V.
(3) V
BAT
= 1.0 V.
handbook, halfpage
0
300
200
100
4
20
IL (mA)
fsw
(kHz)
(1)
MGR140
8
12
16
(2)
(3)
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