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参数资料
| 型号： | MAX5022EUT+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/11页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 290kHz |
| 占空比： | 76% |
| 电源电压： | 11 V ~ 28 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | SOT-6 |
| 包装： | 带卷 (TR) |
Current-Mode PWM Controllers for Isolated
Power Supplies
CENTRAL SEMICONDUCTOR
CBR1-D100S
360k ?
R S = R1 + R2
360k ?
CTX03-15256
T1
480 μ H, 60T
R3
1k ?
150 μ F
6.3V
85VAC TO
265VAC IN
L
N
G
AC
L2
470 μ H
R8
AC C1 1.2k ?
10 μ F
400V
D1
250mA, 75V
CENTRAL SEMICONDUCTOR
CMPD914
C9
10 μ F
400V
R1
R2
C2
0.22 μ F
D1
R11
10 ?
8T
D2
3A, 40V
ON SEMICONDUCTOR
MBRS340T3
3T C4
1%
OPTO
C7
1000pF
TEXAS
INSTRUMENTS
R4
24.9k ?
1%
R10
10 ?
C5
0.01 μ F
C6
0.1 μ F
+5V OUT
C3
0.22 μ F
OPTO
FAIRCHILD
CNY17-3
V CC
OPTO
U1
MAX5022
V IN
NDRV
N1
INTERNATIONAL RECTIFIER
IRFRC20
TLV431AIDBV
R5
8.06k ?
1%
NOTE: ALL RESISTORS ARE 5% UNLESS OTHERWISE SPECIFIED.
GND
CS
R9
240k ?
C8
8200pF
R6
10 ?
R CS
1.78 ?
1%
Figure 1. Universal 5W Off-Line Standby Power Supply
NDRV did not switch enough times to build up sufficient
voltage across the tertiary output to power the device.
The device will go back into UVLO and will not start. Use
a low-leakage ceramic or film capacitor for C2 and C3.
As a rule of thumb, off-line power supplies keep typical
25
20
IC COMES OUT OF UVLO
(WAKEUP)
startup times to less than 500ms even in low-line condi-
tions (85VAC input). Size the startup resistor, R S , to sup-
ply the maximum startup bias of the IC (85μA) plus the
additional current required for charging the capacitors
C2 and C3 in less than 500ms. This resistor dissipates
continuous power in normal operation, despite the fact
15
10
5
V IN
V IN SUPPLIE D BY C2
V IN SUPPLIED BY TERTIARY
WINDING (NORMAL OPERATION)
V CC BYPASS CAPACITOR
FULLY CHARGED
that it is only used during the startup sequence.
Therefore it must be chosen to provide enough current
for the low-line condition as well as have an appropriate
0
0
50
V CC
100
V CC DROPS SLIGHTLY WHEN
NDRV BEGINS SWITCHING
150
200
power rating for the high-line condition (265VAC). In
most cases, split the value into two resistors connected
in series for the required voltage of approximately
400VDC.
The typical value for C2 and C3 is 220nF. The startup
resistor, R S , provides both the maximum quiescent cur-
rent of 85μA and the charging current for C2 and C3.
Bypass capacitor C3 charges to 9.5V and C2 charges
TIME (ms)
Figure 2. V IN and V CC During Startup
to 24V all within the desired time period of 500ms, for
an overall average charging current of 15μA. Hence,
the startup resistor must provide a total of at least
100μA. Developing 100μA from an input voltage of
6
_______________________________________________________________________________________
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| MAX5023_05 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer |
| MAX5023_ASA | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:65V, Low-Quiescent-Current, High-Voltage Linear Regulators with レP Reset and Watchdog Timer |
| MAX5023LASA | 功能描述:线性稳压器 - 标准 65V Low-Q w/uP Reset & Watchdog Timer RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
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