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参数资料
| 型号： | MAX15005BAUE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 16-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 81.5% |
| 电源电压： | 4.5 V ~ 40 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 是 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
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MAX15004A/B/MAX15005A/B
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC Power-Supply Controllers
(t DISCHARGE ). See Figures 3a and 3b for a coarse selec-
tion of capacitor values for a given switching frequency
and maximum duty cycle and then use the following
equations to calculate the resistor value to fine-tune the
The MAX15004A/B is a 50% maximum duty-cycle part,
while the MAX15005A/B is 100% maximum duty-cycle
part.
2 OSC
switching frequency and verify the worst-case maximum
duty cycle.
f OUT =
1
f
t CHARGE =
D MAX
f OSC
for the MAX15004A/B and
RT = CHARGE
t DISCHARGE =
t
0 . 7 × CT
2 . 25 ( V ) × RT × CT
( 1 . 33 × 10 ? 3 ( A ) × RT ) ? 3 . 375 ( V )
f OUT = f OSC
for the MAX15005A/B.
................... Us e This Equation If f OSC ≤ 500 kHz
? t + t
f OS C = ?
?
....... Use This Equation If f OSC > 500 k Hz
? 1
? CHARGE DISCHARGE
1
? ? t CHARGE + t DISCHA R GE + 160 ns
where f OSC is the oscillator frequency, RT is a resistor
connected from RTCT to REG5, and CT is a capacitor
connected from RTCT to SGND. Verify that the oscilla-
tor frequency value meets the target. Above calcula-
tions could be repeated to fine-tune the switching
frequency.
The MAX15004A/B/MAX15005A/B can be synchronized
using an external clock at the SYNC input. For proper
frequency synchronization, SYNC’s input frequency must
be at least 102% of the programmed internal oscillator
frequency. Connect SYNC to SGND when not using an
external clock. A rising clock edge on SYNC is interpret-
ed as a synchronization input. If the SYNC signal is lost,
the internal oscillator takes control of the switching rate,
returning the switching frequency to that set by RC net-
work connected to RTCT. This maintains output regula-
tion even with intermittent SYNC signals.
RTCT
CLKINT
SYNC
OUT
MAX15004A/B (D MAX = 50%)
WITH SYNC
INPUT
WITHOUT
SYNC INPUT
D = 50%
D = 50%
MAX15005A/B (D MAX = 81%)
RTCT
CLKINT
SYNC
OUT
D = 81.25%
Figure 2. Timing Diagram for Internal Oscillator vs. External SYNC and DMAX Behavior
Maxim Integrated
WITH SYNC
INPUT
D = 80%
WITHOUT
SYNC INPUT
13
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