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| 型号： | MAX15001BEUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 10-UMAX |
| 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： | 2.5MHz |
| 占空比： | 75% |
| 电源电压： | 9.5 V ~ 24 V |
| 降压： | 无 |
| 升压： | 是 |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
Current-Mode PWM Controllers with
Programmable Switching Frequency
n-Channel MOSFET Switch Driver
The NDRV output drives an external n-channel MOSFET.
The internal regulator output (V CC ), set to approximately
9V, drives NDRV. For the universal input voltage range,
the MOSFET used must withstand the DC level of the
high-line input voltage plus the reflected voltage at the
primary of the transformer. Most applications that use the
discontinuous flyback topology require a MOSFET rated
at 600V. NDRV can source/sink in excess of 650/1000mA
peak current; therefore, select a MOSFET that will yield
acceptable conduction and switching losses.
Oscillator/Switching Frequency
Use an external resistor at RT to program the
MAX15000/MAX15001 internal oscillator frequency
between 50kHz and 2.5MHz. The MAX15000A/
MAX15001A output switching frequency is one-half of
the programmed oscillator frequency with a 50% duty
cycle. The MAX15000B/MAX15001B output switching
frequency is one-quarter of the programmed oscillator
frequency with a 75% duty cycle.
The MAX15000A/MAX15001A and MAX15000B/
MAX15001B have programmable output switching fre-
quencies from 25kHz to 625kHz and 12.5kHz to
625kHz, respectively. Use the following formulas to
determine the appropriate value of the resistor R12
(see Figure 1) needed to generate the desired output
switching frequency (f SW ) at the NDRV output:
MAX15000 fig04
V OUT
2V/div
100mA LOAD ON/V OUT1
100mA LOAD ON/V OUT2
2ms/div
Figure 4. Primary-Side Output Voltage Soft-Start During Initial
Startup for the Circuit in Figure 6
Internal Error Amplifier
The MAX15000/MAX15001 include an internal error
amplifier to regulate the output voltage in the case of a
nonisolated power supply (see Figure 1). For the circuit
in Figure 1, calculate the output voltage using the fol-
V OUT = ? 1 + ? V REF
R 12 =
R 12 =
10 10
2 f SW
10 10
4 f SW
for the MAX 15000 A / MAX 15001 A .
for the MAX 15000 B / MAX 15001 B .
lowing equation:
? R 13 ?
? R 14 ?
where V REF = 1.23V. The amplifier’s noninverting input
R 15 = 88 . 9 × ( ) 4
where R12 is the resistor connected from RT to GND
(see Figure 1).
Connect an RC network in parallel with R12 as shown in
Figure 1. The RC network should consist of a 100nF
capacitor C6 (for stability) in series with resistor R15
which serves to further minimize jitter. Use the following
formula to determine the value of R15:
1
R 12
is internally connected to a digital soft-start circuit that
gradually increases the reference voltage during start-
up applied to this input. This forces the output voltage
to come up in an orderly and well-defined manner
under all load conditions.
The error amplifier may also be used to regulate the ter-
tiary winding output which implements a primary-side-
regulated, isolated power supply (see Figure 6). For the
circuit in Figure 6, calculate the output voltage using
the following equation:
V OUT = S ? ? 1 +
? V REF + V D 6 ? ? V D 2
?
For example, if R12 is 4k?, R15 becomes 707?.
N ? ?
N T ? ?
R 2 ?
R 1 ? ?
where N S is the number of secondary winding turns, N T
is the number of tertiary winding turns, and both V D6
and V D2 are the diode drops at the respective outputs.
______________________________________________________________________________________
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