参数资料
型号: UCC28250PWR
厂商: Texas Instruments
文件页数: 23/53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:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)
包装: 带卷 (TR)
SLUSA29C – APRIL 2010 – REVISED JULY 2011
HICC (10/17)
The cycle-by-cycle current limit operation time before all four outputs shut down can be programmed by an
external capacitor C HICC from HICC pin to ground, as shown in Figure 15 . Once all four outputs are shutdown,
controller goes into hiccup cycle which is about 100 times of the cycle-by-cycle current limit shut-down delay
time. A 1-mA internal current source charges HICC pin up to 2.4 V, then the HICC pin is discharged by a 2.7- μ A
internal current source to generate long hiccup restart time until HICC reaches 0.3 V. Based on the system
requirement, once the cycle-by-cycle current limit delay time T OC(delay) is selected, the HICC pin capacitor C HICC
can be selected based on the equation
C HICC =
T OC(delay ) 75 m A
0.6 V
T OCdealy
T HICC
(13)
HICC
2.4V
0.6V
0.3V
t
SS
4V
t
OUTA
OUTB
Normal
OC
Normal
OC
Hiccup
Soft Start
Figure 16. Cycle-by-Cycle Current Limit Delay Timer and Hiccup Restart Timer
As shown in Figure 16 , cycle-by-cycle current limiting shut-down delay time is:
T OC(delay ) = C HICC ′
0.6 V
75 m A
(14)
And hiccup-restart-time T HICC is equal to:
T HICC = C HICC ′
2.4 V - 0.3 V
2.7 m A
(15)
As soon as the outputs are shut-down, the SS pin is pulled to ground internally until the hiccup restart timer is
reset after time duration T HICC .
Copyright ? 2010 – 2011, Texas Instruments Incorporated
Product Folder Link(s): UCC28250
23
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