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| 型号： | MAX5069DAUE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM CM 16-TSSOP |
| 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： | 2 |
| 频率 - 最大： | 2.5MHz |
| 占空比： | 100% |
| 电源电压： | 10.8 V ~ 24 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers
V IN
MAX5069A/D
R6
UVLO/EN
V HYST = V ON - V OFF
R7
1.23V
1.18V
V OFF
V ON
Figure 2. Setting the MAX5069A/D Undervoltage Lockout
Threshold
hysteresis that allows the user to set a voltage (V OFF ) to
disable the controller (see Figure 3).
At the beginning of the startup sequence, UVLO/EN is
Figure 3. MAX5069 Hysteresis
V IN
below the 1.23V threshold, and Q1 turns on connecting
R HYST to GND ( Figure 4). Once the UVLO 1.23V thresh-
old is crossed, Q1 turns off, resulting in the series com-
bination of R6, R HYST , and R7, placing the MAX5069 in
MAX5069B/C
UVLO/EN
R6
normal operating condition.
Calculate the turn-on voltage (V ON ) by using the fol-
lowing formula:
1.23V
1.18V
HYST
R HYST
R 6 = ?
? 1 ? × R HYST
? V ON
? V ULR 2
?
?
Q1
R7
where V ULR2 is the UVLO/EN’s 1.23V rising threshold.
Choose an R HYST value in the 20k ? range.
The MAX5069 turns off when the MAX5069 UVLO/EN
R 7 = R 6 / ? OFF ? 1 ? ? R HYST
falls below the 1.18V falling threshold. The turn-off volt-
age (V OFF ) is then defined as:
? V ?
? V ULF 2 ?
where V ULF2 is the 1.18V UVLO/EN falling threshold.
Bootstrap Undervoltage Lockout
(MAX5069A/B)
In addition to the externally programmable UVLO func-
tion offered by the MAX5069, the MAX5069A/B feature
an additional internal bootstrap UVLO for use in high-
voltage power supplies (see the Functional Diagram ).
This allows the device to bootstrap itself during initial
Figure 4. Setting the MAX5069B/C Turn-On/Turn-Off Voltages
power-up. The MAX5069A/B start when V IN exceeds
the bootstrap UVLO threshold of 23.6V.
During startup, the UVLO circuit keeps the PWM com-
parator, ILIM comparator, oscillator, and output drivers
shut down to reduce current consumption. Once V IN
reaches 23.6V, the UVLO circuit turns on both the PWM
and ILIM comparators, as well as the oscillator, and
allows the output driver to switch. If V IN drops below
9.7V, the UVLO circuit shuts down the PWM compara-
tor, ILIM comparator, oscillator, and output drivers,
returning the MAX5069A/B to the startup mode.
______________________________________________________________________________________
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