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| 型号： | UCC28250PWR |
| 厂商： | Texas Instruments |
| 文件页数： | 24/53页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM/VM 20-TSSOP |
| 标准包装： | 2,000 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 100% |
| 电源电压： | 4.7 V ~ 17 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： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
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SLUSA29C – APRIL 2010 – REVISED JULY 2011
OVP/OTP (19/6)
The OVP/OTP pin provides multiple fault protection functions. If the voltage on the OVP/OTP pin exceeds 0.7 V,
a fault shutdown occurs. All outputs stop switching and stay off (low) during the shutdown, and the SS pin is
pulled to ground internally. Once the fault condition is cleared (i.e. OVP/OTP voltage drops below 0.7 V), the
UCC28250 enters hiccup mode. A soft-start cycle begins after the hiccup cycle is finished. An internal 11- μ A
switched current source is used to create hysteresis.
If the external resistor divider runs from line voltage VIN, a line over voltage protection is implemented.
If the external resistor divider runs from the output voltage, output over voltage fault protection is achieved.
According to the protection threshold V R and recovery threshold V F , choose an arbitrary R 2 value. To ensure a
realistic solution, R 2 needs to meet the following:
R 2 <
0.7 V ′ ( V R - V F )
11 m A ′ ( V R - 0.7 V )
(16)
The other two resistors, R 1 and R 3 can be calculated.
R 1 =
V R - 0.7 V
0.7 V
′ R 2
(17)
R 3 =
0.7 V ′ ( V R - V F ) - 11 m A ′ R 2 ′ ( V R - 0.7 V )
11 m A ′ V R
(18)
If the external resistor divider runs from 3.3-V VREF, and replaces R 2 with a positive temperature coefficient
(PTC) thermistor, an over temperature fault protection with programmable hysteresis is accomplished
( Figure 18 ). Choose an arbitrary PTC value, which has a resistance as R PTC1 at protection temperature and
resistance as R PTC2 at recovery temperature. Because of its positive temperature coefficient, R PTC1 is larger than
R PTC2 . To ensure an available solution, R PTC1 and R PTC2 need to meet the criteria.
0.7 V ′ ( R PTC1 - R PTC2 ) - 11 m A ′ R PTC1 ′ R PTC2 3 0
And resistors R 1 and R 3 can be calculated as:
R 1 = 3.7 ′ R PTC1
(19)
(20)
R 3 =
2.6 V ′ ? é 0.7 V ′ ( R PTC1 - R PTC2 ) - 11 m A ′ R PTC1 ′ R PTC2 ? ù
11 m A ′ ( 2.6 V ′ R PTC1 + 0.7 V ′ R PTC2 )
UCC28250
VREF
VIN or VOUT
11 m A
R1
(21)
R2
R3
OVP
0.7 V
+
Figure 17. Over Voltage Protection
24
Product Folder Link(s): UCC28250
Copyright ? 2010 – 2011, Texas Instruments Incorporated
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