参数资料
型号: TPS51217DSCR
厂商: Texas Instruments
文件页数: 16/29页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM 10-SON
标准包装: 1
系列: D-CAP™
PWM 型: 控制器
输出数: 1
频率 - 最大: 368kHz
占空比: 89%
电源电压: 4.5 V ~ 6.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 10-WFDFN 裸露焊盘
包装: 标准包装
其它名称: 296-28856-6
SLUS947B – JUNE 2009 – REVISED APRIL 2012
within the threshold window, PGOOD, OVP and UVP are released from masking. The TRAN pin operation is
useful for graphics power applications such that switcher output voltage needs to be changed dynamically. At the
transition of output voltage, inductor current has a chance to hit over current limit (OCL) to quickly charge the
output capacitor, which may cause output voltage undershoot or overshoot. Capacitance C1 in parallel with the
top resistor slows down transition slew rate and prevent from hitting OCL. Time constant of the transition is
R1 × C1. From 3.3 V to 5 V is recommended for VIDx input amplitude.
Vout
VID1
C1
R1
TPS51217
VID0
VFB
2.03 V
1.88 V
2.03 V
R4
R3
R2
TRAN
Disable PGOOD
and OVP/UVP
900 m s
900 m s
Disable PGOOD
and OVP/UVP
R 1
0 . 6 V ′ ( 1 +
R 2 // R 4
)
VID1
C2
C3
R5
TRAN
V OUT
0 . 6 V ′ ( 1 +
R 1
R 2 // R 3
)
VID0
C 2 = 2 ′ C 3
t = R 1 ′ C 1
0 . 6 V ′ ( 1 + R 1 / R 2 )
Figure 22. Dynamic Voltage Step Application
UVLO PROTECTION
TPS51217 has V5IN undervoltage lockout protection (UVLO). When the V5IN voltage is lower than UVLO
threshold voltage, the switch mode power supply shuts off. This is non-latch protection.
THERMAL SHUTDOWN
TPS51217 monitors the die temperature. If the temperature exceeds the threshold value (typically 145°C), the
TPS51217 is shut off. This is non-latch protection.
16
Product Folder Link(s) : TPS51217
Copyright ? 2009–2012, Texas Instruments Incorporated
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