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参数资料
| 型号： | MAX5015EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/14页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX5015 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 输出电压： | 5V |
| 电流 - 输出： | 10A |
| 输入电压： | 36 ~ 72V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 275kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX5015 |
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
V+
V DD
OPTO
SS_ SHDN
CS
GND
NDRV
V CC
FUNCTION
High-Voltage Startup Input. Connect directly to an input voltage between 18V to 110V. Connects
internally to a high-voltage linear regulator that generates V CC during startup.
V DD is the Input of the Linear Regulator that Generates V CC . For supply voltages less than 36V, V DD
and V+ can both be connected to the supply. For supply voltages greater than 36V, V DD receives
its power from the tertiary winding of the transformer and accepts voltages from 13V to 36V. Bypass
to GND with a 4.7μF capacitor.
Optocoupler Input. The control voltage range on this input is 2V to 3V.
Soft-Start Timing Capacitor Connection. Ramp time to full current limit is approximately 0.45ms/nF.
This pin is also the reference voltage output. Bypass with a minimum 10nF capacitor to GND. The
device goes into shutdown when V SS_ SHDN is pulled below 0.25V.
Current Sense Input. Turns power switch off if V CS rises above 465mV for cycle-by-cycle current
limiting. CS is also the feedback for the current-mode controller. CS is connected to the PWM
comparator through a leading edge blanking circuit.
Ground
Gate Drive. Drives a high-voltage external N-channel power MOSFET.
Regulated IC Supply. Provides power for the entire IC. V CC is regulated from V DD during normal
operation and from V+ during startup. Bypass V CC with a 10 μ F tantalum capacitor in parallel with
0.1μF ceramic capacitor to GND.
Detailed Description
Use the MAX5014/MAX5015 PWM current-mode con-
trollers to design flyback- or forward-mode power sup-
plies. Current-mode operation simplifies control-loop
design while enhancing loop stability. An internal high-
voltage startup regulator allows the device to connect
directly to the input supply without an external startup
resistor. Current from the internal regulator starts the
controller. Once the tertiary winding voltage is estab-
lished the internal regulator is switched off and bias
current for running the IC is derived from the tertiary
winding. The internal oscillator is set to 275kHz and
trimmed to ±10%. This permits the use of small mag-
netic components to minimize board space. Both the
MAX5014 and MAX5015 can be used in power sup-
plies providing multiple output voltages. A functional
diagram of the IC is shown in Figure 1. Typical applica-
tions circuits for forward and flyback topologies are
shown in Figure 2 and Figure 3, respectively.
Current-Mode Control
The MAX5014/MAX5015 offer current-mode control
operation with added features such as leading-edge
blanking with dual internal path that only blanks the
sensed current signal applied to the input of the PWM
comparator. The current limit comparator monitors the
CS pin at all times and provides cycle-by-cycle current
limit without being blanked. The leading-edge blanking
of the CS signal prevents the PWM comparator from
prematurely terminating the on cycle. The CS signal
contains a leading-edge spike that is the result of the
MOSFET gate charge current, capacitive and diode
reverse recovery current of the power circuit. Since this
leading-edge spike is normally lower than the current
limit comparator threshold, current limiting is not
blanked and cycle-by-cycle current limiting is provided
under all conditions.
Use the MAX5014 in discontinuous flyback applications
where wide line voltage and load current variation is
expected. Use the MAX5015 for single transistor for-
ward converters where the maximum duty cycle must
be limited to less than 50%.
Under certain conditions it may be advantageous to
use a forward converter with greater than 50% duty
cycle. For those cases use the MAX5014. The large
duty cycle results in much lower operating primary
RMS currents through the MOSFET switch and in most
cases a smaller output filter inductor. The major disad-
vantage to this is that the MOSFET voltage rating must
be higher and that slope compensation must be provid-
ed to stabilize the inner current loop. The MAX5014
provides internal slope compensation.
6
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