参数资料
型号: MAX5003CSE+T
厂商: Maxim Integrated Products
文件页数: 13/16页
文件大小: 0K
描述: IC REG CTRLR FLYBK ISO VM 16SOIC
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
PWM 型: 电压模式
输出数: 1
频率 - 最大: 1.2MHz
占空比: 75%
电源电压: 11 V ~ 110 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 70°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
High-Voltage PWM
Power-Supply Controller
0V
XFACOILTRCTX03
2
L P
65 μ H
CMSD4448
8
R1
IRFD620S
4.7 μ F
1M
7
ES
0.1 μ F
R2
39k
62k
1
2
3
4
5
6
7
8
V+ V DD
INDIV V CC
NDRV
MAX5003
FREQ
PGND
SS CS
REF AGND
CON MAXTON
COMP FB
16
15
14
13
12
11
10
9
10 μ F
33 μ F
100 ?
0.1 μ F
5
MBRS130L
11, 12
9, 10
6
22 μ F
22 μ F
240k
680 ?
51 ?
0.01 μ F
+5V
1A
-
1.3k
7
1
5
MDC217
2
3900pF
0.1 μ F
470nF
0.1 μ F
24.9k
V IN
-48V
51k
R CS
0.1 ?
TL431
24.9k
-36V TO -72V
Figure 3. Application Example 2: Isolated -48V to +5V Converter
where:
DC = Duty cycle. Set to calculated minimum duty
cycle at V MIN.
PWR IN = Input power, at maximum output power
This gives an inductance value (L PRI ) of approxi-
mately 65μH.
5) The other parameter that defines the transformer is
peak current. This is given by:
6) For this application, the MAX5003 must be pro-
grammed for a maximum duty cycle of 55% at 36V.
The MAX5003 will automatically scale the limit with
the reciprocal of the input voltage as it changes. The
duty-cycle limit for an input voltage of 72V will be
27% (half of 55%). The duty cycle needed to stay out
of continuous conduction at 72V is 37%, so there is a
10% margin. The maximum duty time scales with the
voltage at the undervoltage lockout pin, V INDIV . The
voltage at INDIV is set by selecting the power line
I PRI =
2 × PWR IN
L PRI × ? SW
=
2 × 6.25W
65 μ H × 300kHz
= 0.8A
undervoltage lockout trip point. The trip point for this
system, running from 36V to 72V, is 32V. Then INDIV
must be connected to the center point of a divider
with a ratio of 32/1.25, connected between the
DC ( MIN ) = DC ( MAX ) ×
= 43 % ×
=
? V ? ? 100 kHz ? ? DC MAX ( V MIN ) ?
R MAXTON = ? MIN ? ? ? ? ? 200 k ?
= ?
? 200 k ? = 55 k ?
? 36 V ? ? 100 kHz ? ? 55 % ?
? 32 V ? ? 300 kHz ? ? 75 % ?
The peak secondary current is the peak primary cur-
rent multiplied by the turns ratio, or 0.8A · 8 = 6.4A.
Calculating the minimum duty cycle:
V IN ( MIN ) 36 V
V IN ( MAX ) 72 V
With these numbers, the transformer manufacturer
can choose a core.
power line and ground. Then R MAXTON is:
? V UVL ? ? ? SW ? ? 75 % ?
? ? ? ?
______________________________________________________________________________________
13
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