參數(shù)資料
型號(hào): PCA5010H
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(yè)數(shù): 69/112頁(yè)
文件大小: 627K
代理商: PCA5010H
1998 Nov 02
69
Philips Semiconductors
Product specification
Pager baseband controller
PCA5010
Table 54
Ripples in normal operation 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.44.
MODE
STANDBY
NORM
t
n
= 6.51
μ
s
t
n
= 1, 2 or 4
μ
s
0.2
D
p
0.73
t
n
= 6.51
μ
s
t
n
= 1, 2 or 4
μ
s
t
n
= 6.51
μ
s
t
n
= 1, 2 or 4
μ
s
I
peak
V
BAT
t
n
L
---
×
=
I
ripple
V
BAT
t
n
L
---
×
=
I
Lmean
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.44 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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