PDF《用于电池测试解决方案的降压/升压 PWM控制器》

VSCFG <

4.25 V,可将一个相移引入同步时钟.驱动 VSCFG ≤ 0.5 V时,SYNC配置为无相移的输入,器件与外部时钟源同步.如果SCFG悬空,SYNC引脚内部 连接到VREG,SYNC配置为输出. ADP1972 5.8 5.7 5.6 5.5 5.4 5.3 5.2 C40 C5

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100 VIN UVLO THRESHOLD (V) TEMPERATURE (°C) RISING FALLING 11884-003 图3. 输入电压UVLO阈值与温度的关系,VFAULT =

0 V

30 0

5 10

15 20

25 6

60 51

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24 15 SHUTDOWN CURRENT (?A) INPUT VOLTAGE (V) TA = C40°C TA = +25°C TA = +125°C 11884-004 图4. 关断电流与输入电压的关系,VEN =

0 V且VFAULT =

0 V 1.9 1.3 1.4 1.5 1.6 1.7 1.8

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51 42

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15 NONSWITCHING QUIESCENT CURRENT (mA) INPUT VOLTAGE (V) TA = C40°C TA = +25°C TA = +85°C TA = +125°C 11884-005 图5. 非开关静态电流与输入电压的关系(SYNC = 悬空) ADP1972 0.45 0.15 0.20 0.25 0.30 0.35 0.40

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15 EN PIN CURRENT (?A) EN PIN VOLTAGE (V) TA = C40°C TA = +25°C TA = +125°C 11884-007 图6. EN引脚电流与EN引脚电压的关系,VEN =

5 V且VFAULT =

0 V 1.25 1.20 1.21 1.22 1.23 1.24 C40 C5

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100 EN PIN THRESHOLD (V) TEMPERATURE (°C) RISING FALLING 11884-008 图7. EN引脚阈值与温度的关系,VFAULT =

0 V 5.00 4.88 4.90 4.92 4.94 4.96 4.98 C40

120 80

40 0 SS PIN CURRENT (?A) TEMPERATURE (°C) VIN = 6V VIN = 24V VIN = 60V 11884-009 图8. SS引脚电流与温度的关系 Rev.

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20 典型性能参数 除非另有说明,VVIN = VEN = VFAULT =

24 V,VMODE = VCL = VSS = VCOMP =

0 V,TA = 25°C. 97.8 97.2 97.3 97.4 97.5 97.6 97.7

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15 MAXIMUM INTERNAL DUTY CYCLE (%) INPUT VOLTAGE (V) TA = C40°C TA = +25°C TA = +125°C 11884-010 图9. 最大内部占空比与输入电压的关系,RFREQ =

100 kΩ,VCOMP =

5 V, DL、DH或DMAX上无负载

450 0

50 100

150 200

250 300

400 350

0 20

40 60

80 100 R DMAX (k?) DUTY CYCLE (%) TA = C40°C TA = +25°C TA = +125°C 11884-011 图10. RDMAX 与占空比的关系,RFREQ =

100 kΩ,VCOMP =

5 V, DL或DH上无负载

100 80

60 40

20 0 0.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 DUTY CYCLE (%) VCOMP (V) TA = C40°C TA = +25°C TA = +125°C 11884-018 图11. 占空比与VCOMP 的关系,RFREQ =

100 kΩ,DL、DH或DMAX上无负载

210 30

50 70

90 110

130 150

170 190

50 100

150 200

250 300 R FREQ (MASTER) (k Ω ) fSET (kHz) 11884-015 图12. RFREQ (MASTER) 与开关频率(fSET )的关系 5.020 4.990 4.995 5.000 5.005 5.010 5.015

6 60

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15 VREG (V) INPUT VOLTAGE (V) TA = C40°C TA = +25°C TA = +85°C TA = +125°C 11884-016 图13. VREG与输入电压的关系(空载) 5.020 4.980 4.985 4.990 4.995 5.000 5.005 5.010 5.015

0 5

4 3

2 1 VREG (V) LOAD CURRENT (mA) TA = C40°C TA = +25°C TA = +85°C TA = +125°C 11884-017 图14. VREG与负载电流的关系 Rev.

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20 ADP1972 11884-0........